668 lines
22 KiB
Ruby
668 lines
22 KiB
Ruby
#
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# Copyright (C) 2011 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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require 'csv'
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class GradebookImporter
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ASSIGNMENT_PRELOADED_FIELDS = %i/
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id title points_possible grading_type updated_at context_id context_type group_category_id
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created_at due_at only_visible_to_overrides moderated_grading grades_published_at final_grader_id
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/.freeze
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class NegativeId
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class << self
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def generate
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instance.next
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end
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def instance
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@@inst ||= new
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end
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end
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def next
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@i ||= 0
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@i -= 1
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end
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end
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class InvalidHeaderRow < StandardError; end
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attr_reader :context, :contents, :attachment, :assignments, :students,
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:submissions, :missing_assignments, :missing_students, :upload
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def self.create_from(progress, gradebook_upload, user, attachment)
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self.new(gradebook_upload, attachment, user, progress).parse!
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end
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def initialize(upload=nil, attachment=nil, user=nil, progress=nil)
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@upload = upload
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@context = upload.course
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raise ArgumentError, "Must provide a valid context for this gradebook." unless valid_context?(@context)
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raise ArgumentError, "Must provide attachment." unless attachment
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@user = user
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@attachment = attachment
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@progress = progress
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@visible_assignments = AssignmentStudentVisibility.visible_assignment_ids_in_course_by_user(
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course_id: @context.id, user_id: @context.all_students.pluck(:id)
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)
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end
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CSV::Converters[:nil] = lambda do |e|
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begin
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e.nil? ? e : raise
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rescue
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e
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end
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end
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CSV::Converters[:decimal_comma_to_period] = -> (field) do
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if field =~ /^-?[0-9.,]+%?$/
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# This field is a pure number or percentage => let's normalize it
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number_parts = field.split(/[,.]/)
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last_number_part = number_parts.pop
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if number_parts.empty?
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last_number_part
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else
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[number_parts.join(), last_number_part].join('.')
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end
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else
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field
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end
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end
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def parse!
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# preload a ton of data that presumably we'll be querying
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@context.preload_user_roles!
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@all_assignments = @context.assignments
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.preload({ context: :account })
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.published
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.gradeable
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.select(ASSIGNMENT_PRELOADED_FIELDS)
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.index_by(&:id)
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@all_students = @context.all_students
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.select(['users.id', :name, :sortable_name, 'users.updated_at'])
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.index_by(&:id)
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@assignments = nil
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@root_accounts = {}
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@pseudonyms_by_sis_id = {}
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@pseudonyms_by_login_id = {}
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@students = []
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@pp_row = []
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@warning_messages = {
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prevented_new_assignment_creation_in_closed_period: false,
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prevented_grading_ungradeable_submission: false,
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prevented_changing_read_only_column: false
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}
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@parsed_custom_column_data = {}
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@gradebook_importer_assignments = {}
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@gradebook_importer_custom_columns = {}
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begin
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csv_stream do |row|
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already_processed = check_for_non_student_row(row)
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unless already_processed
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@students << process_student(row)
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process_submissions(row, @students.last)
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end
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end
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rescue InvalidHeaderRow
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@progress.message = "Invalid header row"
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@progress.workflow_state = "failed"
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@progress.save
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return
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end
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@missing_assignments = []
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@missing_assignments = @all_assignments.values - @assignments if @missing_assignment
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@missing_students = []
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@missing_students = @all_students.values - @students if @missing_student
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# look up existing score for everything that was provided
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assignment_ids = @missing_assignment ? @all_assignments.values : @assignments
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user_ids = @missing_student ? @all_students.values : @students
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# preload periods to avoid N+1s
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periods = GradingPeriod.for(@context)
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# preload is_admin to avoid N+1
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is_admin = @context.account_membership_allows(@user)
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# Preload effective due dates to avoid N+1s
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effective_due_dates = EffectiveDueDates.for_course(@context, @all_assignments.values)
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@original_submissions = @context.submissions
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.preload(:grading_period, assignment: { context: :account })
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.select(['submissions.id', :assignment_id, :user_id, :grading_period_id, :score, :excused, :cached_due_date, 'submissions.updated_at'])
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.where(assignment_id: assignment_ids, user_id: user_ids)
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.map do |submission|
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is_gradeable = gradeable?(submission: submission, is_admin: is_admin)
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score = submission.excused? ? "EX" : submission.score.to_s
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{
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user_id: submission.user_id,
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assignment_id: submission.assignment_id,
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score: score,
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gradeable: is_gradeable
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}
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end
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# cache the score on the existing object
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original_submissions_by_student = @original_submissions.inject({}) do |r, s|
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r[s[:user_id]] ||= {}
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r[s[:user_id]][s[:assignment_id]] ||= {}
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r[s[:user_id]][s[:assignment_id]][:score] = s[:score]
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r[s[:user_id]][s[:assignment_id]][:gradeable] = s[:gradeable]
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r
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end
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@students.each do |student|
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@gradebook_importer_assignments[student.id].each do |submission|
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submission_assignment_id = submission.fetch('assignment_id').to_i
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assignment = original_submissions_by_student.
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fetch(student.id, {}).
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fetch(submission_assignment_id, {})
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submission['original_grade'] = assignment.fetch(:score, nil)
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submission['gradeable'] = assignment.fetch(:gradable, nil)
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if submission.fetch('gradeable').nil?
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assignment = @all_assignments[submission['assignment_id']] || @context.assignments.build
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new_submission = Submission.new
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new_submission.user = student
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new_submission.assignment = assignment
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edd = effective_due_dates.find_effective_due_date(student.id, assignment.id)
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new_submission.cached_due_date = edd.fetch(:due_at, nil)
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new_submission.grading_period_id = edd.fetch(:grading_period_id, nil)
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submission['gradeable'] = !edd.fetch(:in_closed_grading_period, false) && gradeable?(
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submission: new_submission,
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is_admin: is_admin
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)
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end
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end
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@gradebook_importer_custom_columns[student.id].each do |column_id, student_custom_column_cell|
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custom_column = custom_gradebook_columns.detect {|custom_col| custom_col.id == column_id}
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datum = custom_column.custom_gradebook_column_data.detect {|custom_column_datum| custom_column_datum.user_id == student.id}
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student_custom_column_cell['current_content'] = datum&.content
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end
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end
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translate_pass_fail(@assignments, @students, @gradebook_importer_assignments)
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unless @missing_student
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# weed out assignments with no changes
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indexes_to_delete = []
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@assignments.each_with_index do |assignment, idx|
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next if assignment.changed? && !readonly_assignment?(idx)
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indexes_to_delete << idx if readonly_assignment?(idx) || @students.all? do |student|
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submission = @gradebook_importer_assignments[student.id][idx]
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# Have potentially mixed case excused in grade match case
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# expectations for the compare so it doesn't look changed
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submission['grade'] = 'EX' if submission['grade'].to_s.casecmp('EX') == 0
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no_change = submission['grade'] == submission['original_grade'] ||
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(submission['original_grade'].present? && submission['grade'].present? && submission['original_grade'].to_f == submission['grade'].to_f) ||
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(submission['original_grade'].blank? && submission['grade'].blank?)
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@warning_messages[:prevented_grading_ungradeable_submission] = true if !submission['gradeable'] && !no_change
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no_change || !submission['gradeable']
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end
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end
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custom_column_ids_to_skip_on_import = []
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custom_gradebook_columns.each do |custom_column|
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no_change = true
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if @parsed_custom_column_data.include?(custom_column.id) && !custom_column.deleted?
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no_change = no_change_to_column_values?(column_id: custom_column.id)
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@warning_messages[:prevented_changing_read_only_column] = true if !no_change && custom_column.read_only
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end
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if no_change || exclude_custom_column_on_import(column: custom_column)
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custom_column_ids_to_skip_on_import << custom_column.id
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end
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end
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indexes_to_delete.reverse_each do |index|
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@assignments.delete_at(index)
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@students.each do |student|
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@gradebook_importer_assignments[student.id].delete_at(index)
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end
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end
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@custom_gradebook_columns = @custom_gradebook_columns.reject { |custom_col| custom_column_ids_to_skip_on_import.include?(custom_col.id) }
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@students.each do |student|
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@gradebook_importer_custom_columns[student.id].reject! do |column_id, _custom_col|
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custom_column_ids_to_skip_on_import.include?(column_id)
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end
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end
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@students.each do |student|
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@gradebook_importer_assignments[student.id].select! { |sub| sub['gradeable'] }
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end
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@unchanged_assignments = !indexes_to_delete.empty?
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@students = [] if @assignments.empty? && @custom_gradebook_columns.empty?
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end
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# remove concluded enrollments
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prior_enrollment_ids = (
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@all_students.keys - @context.gradable_students.pluck(:user_id).map(&:to_i)
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).to_set
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@students.delete_if { |s| prior_enrollment_ids.include? s.id }
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@original_submissions = [] unless @missing_student || @missing_assignment
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if prevent_new_assignment_creation?(periods, is_admin)
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@assignments.delete_if do |assignment|
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new_assignment = assignment.new_record?
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if new_assignment
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@warning_messages[:prevented_new_assignment_creation_in_closed_period] = true
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end
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new_assignment
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end
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end
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@upload.gradebook = self.as_json
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@upload.save!
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end
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def translate_pass_fail(assignments, students, gradebook_importer_assignments)
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assignments.each_with_index do |assignment, idx|
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next unless assignment.grading_type == "pass_fail"
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students.each do |student|
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submission = gradebook_importer_assignments.fetch(student.id)[idx]
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if submission['grade'].present?
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gradebook_importer_assignments.fetch(student.id)[idx]['grade'] = assignment.score_to_grade(submission['grade'], \
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submission['grade'])
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end
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if submission['original_grade'].present?
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gradebook_importer_assignments.fetch(student.id)[idx]['original_grade'] = assignment.score_to_grade(submission['original_grade'],
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submission['original_grade'])
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end
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end
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end
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end
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def process_custom_column_headers(row)
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row.each_with_index do |header_column, index|
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gradebook_column = custom_gradebook_columns.detect { |column| column.title == header_column }
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next if gradebook_column.blank?
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@parsed_custom_column_data[gradebook_column.id] = {
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title: header_column,
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index: index,
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read_only: gradebook_column.read_only
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}
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end
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end
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def strip_custom_columns(stripped_row)
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@parsed_custom_column_data.each_value do |column|
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stripped_row.delete(column[:title])
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end
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stripped_row
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end
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def process_header(row)
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raise InvalidHeaderRow unless header?(row)
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row = strip_non_assignment_columns(row)
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row = strip_custom_columns(row)
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parse_assignments(row) # requires non-assignment columns to be stripped
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end
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def header?(row)
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return false unless row_has_student_headers? row
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# this is here instead of in process_header() because @parsed_custom_column_data needs to be updated before update_column_count()
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process_custom_column_headers(row)
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update_column_count row
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return false if last_student_info_column(row) !~ /Section/
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true
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end
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def last_student_info_column(row)
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# Custom Columns are between section and assignments
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row[@student_columns - (1 + @parsed_custom_column_data.length)]
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end
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def row_has_student_headers?(row)
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row.length > 3 && row[0] =~ /Student/ && row[1] =~ /ID/
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end
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def update_column_count(row)
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# A side effect that's necessary to finish validation, but needs to come
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# after the row.length check above.
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@student_columns = 3 # name, user id, section
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if row[2] =~ /SIS\s+Login\s+ID/
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@sis_login_id_column = 2
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@student_columns += 1
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elsif row[2] =~ /SIS\s+User\s+ID/ && row[3] =~ /SIS\s+Login\s+ID/
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@sis_user_id_column = 2
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@sis_login_id_column = 3
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@student_columns += 2
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if row[4] =~ /Root\s+Account/
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@student_columns +=1
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@root_account_column = 4
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end
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end
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# For Custom Columns
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@student_columns += @parsed_custom_column_data.length
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end
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def strip_non_assignment_columns(stripped_row)
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drop_student_information_columns(stripped_row)
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# This regex will also include columns for unposted scores, which
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# will be one of these values with "Unposted" prepended.
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while stripped_row.last =~ /Current Score|Current Points|Current Grade|Final Score|Final Points|Final Grade/
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stripped_row.pop
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end
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stripped_row
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end
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def drop_student_information_columns(row)
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row.shift(@student_columns)
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end
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# this method requires non-assignment columns to be stripped from the row
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def parse_assignments(stripped_row)
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stripped_row.map do |name_and_id|
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title, id = Assignment.title_and_id(name_and_id)
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assignment = @all_assignments[id.to_i] if id.present?
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# backward compat
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assignment ||= @all_assignments.find { |_id, a| a.title == name_and_id }
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.try(:last)
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assignment ||= Assignment.new(:title => title || name_and_id)
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assignment.previous_id = assignment.id
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assignment.id ||= NegativeId.generate
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@missing_assignment ||= assignment.new_record?
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assignment
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end.compact
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end
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def prevent_new_assignment_creation?(periods, is_admin)
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return false unless @context.grading_periods?
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return false if is_admin
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GradingPeriod.date_in_closed_grading_period?(
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course: @context,
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date: nil,
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periods: periods
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)
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end
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def process_pp(row)
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@pp_row = row
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@assignments.each_with_index do |assignment, idx|
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assignment.points_possible = row[idx] if row[idx]
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end
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end
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def process_student(row)
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student_id = row[1] # the second column in the csv should have the student_id for each row
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student = @all_students[student_id.to_i] if student_id.present?
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unless student
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ra_sis_id = row[@root_account_column].presence if @root_account_column
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unless @root_accounts.key?(ra_sis_id)
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ra = ra_sis_id.nil? ? @context.root_account : Account.find_by_domain(ra_sis_id)
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add_root_account_to_pseudonym_cache(ra) if ra
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@root_accounts[ra_sis_id] = ra
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end
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ra = @root_accounts[ra_sis_id]
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if ra && @sis_user_id_column && row[@sis_user_id_column].present?
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sis_user_id = [ra.id, row[@sis_user_id_column]]
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end
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if ra && @sis_login_id_column && row[@sis_login_id_column].present?
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sis_login_id = [ra.id, row[@sis_login_id_column]]
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end
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pseudonym = @pseudonyms_by_sis_id[sis_user_id] if sis_user_id
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pseudonym ||= @pseudonyms_by_login_id[sis_login_id] if sis_login_id
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student = @all_students[pseudonym.user_id] if pseudonym
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end
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if row[0].present?
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student ||= @all_students.find do |_id, s|
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s.name == row[0] || s.sortable_name == row[0]
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end.try(:last)
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end
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student ||= User.new(:name => row[0])
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student.previous_id = student.id
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student.id ||= NegativeId.generate
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@missing_student ||= student.new_record?
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student
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end
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def process_submissions(row, student)
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importer_submissions = []
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@assignments.each_with_index do |assignment, idx|
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assignment_id = assignment.new_record? ? assignment.id : assignment.previous_id
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grade = row[idx + @student_columns]
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if !assignment_visible_to_student(student, assignment, assignment_id, @visible_assignments)
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grade = ''
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end
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new_submission = {
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'grade' => grade,
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'assignment_id' => assignment_id,
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}
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importer_submissions << new_submission
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end
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# custom columns
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importer_custom_columns = {}
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@parsed_custom_column_data.each do |id, custom_column|
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column_index = custom_column[:index]
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new_custom_column_data = {
|
|
'new_content' => row[column_index],
|
|
'column_id' => id
|
|
}
|
|
importer_custom_columns[id] = new_custom_column_data
|
|
end
|
|
|
|
@gradebook_importer_custom_columns[student.id] = importer_custom_columns
|
|
@gradebook_importer_assignments[student.id] = importer_submissions
|
|
end
|
|
|
|
def assignment_visible_to_student(student, assignment, assignment_id, visible_assignments)
|
|
return true unless visible_assignments # wont be set if DA is off
|
|
return true if assignment.new_record? || student.new_record?
|
|
|
|
assignments_visible_to_student = visible_assignments[student.id].to_set
|
|
assignments_visible_to_student.try(:include?, assignment_id)
|
|
end
|
|
|
|
def as_json(_options={})
|
|
{
|
|
:students => @students.map { |s| student_to_hash(s) },
|
|
:assignments => @assignments.map { |a| assignment_to_hash(a) },
|
|
:missing_objects => {
|
|
:assignments => @missing_assignments.map { |a| assignment_to_hash(a) },
|
|
:students => @missing_students.map { |s| student_to_hash(s) }
|
|
},
|
|
:original_submissions => @original_submissions,
|
|
:unchanged_assignments => @unchanged_assignments,
|
|
:warning_messages => @warning_messages,
|
|
:custom_columns => custom_gradebook_columns.map { |cc| custom_columns_to_hash(cc) },
|
|
}
|
|
end
|
|
|
|
protected
|
|
|
|
def custom_gradebook_columns
|
|
@custom_gradebook_columns ||= @context.custom_gradebook_columns.to_a
|
|
end
|
|
|
|
def identify_delimiter(rows)
|
|
field_counts = {}
|
|
%w[; ,].each do |separator|
|
|
begin
|
|
field_counts[separator] = 0
|
|
field_count_by_row = rows.map { |line| CSV.parse_line(line, col_sep: separator).size }
|
|
|
|
# If the number of fields generated by this separator is consistent for all lines,
|
|
# we should be able to assume it's a valid delimiter for this file
|
|
field_counts[separator] = field_count_by_row.first if field_count_by_row.uniq.size == 1
|
|
rescue CSV::MalformedCSVError => e
|
|
end
|
|
end
|
|
|
|
field_counts[';'] > field_counts[','] ? :semicolon : :comma
|
|
end
|
|
|
|
def semicolon_delimited?(csv_file)
|
|
first_lines = []
|
|
File.open(csv_file.path) do |csv|
|
|
while !csv.eof? && first_lines.size < 3
|
|
first_lines << csv.readline
|
|
end
|
|
end
|
|
|
|
return false if first_lines.blank?
|
|
|
|
identify_delimiter(first_lines) == :semicolon
|
|
end
|
|
|
|
def check_for_non_student_row(row)
|
|
# check if this is the first row, a header row
|
|
if @assignments.nil?
|
|
@assignments = process_header(row)
|
|
return true
|
|
end
|
|
|
|
|
|
if row[0] =~ /Points Possible/
|
|
# this row is describing the assignment, has no student data
|
|
row.shift(@student_columns)
|
|
process_pp(row)
|
|
return true
|
|
end
|
|
|
|
if row.compact.all? { |c| c.strip =~ /^(Muted|)$/i }
|
|
# this row is muted or empty and should not be processed at all
|
|
return true
|
|
end
|
|
|
|
false # nothing unusual, signal to process as a student row
|
|
end
|
|
|
|
def csv_stream
|
|
csv_file = attachment.open(need_local_file: true)
|
|
is_semicolon_delimited = semicolon_delimited?(csv_file)
|
|
csv_parse_options = {
|
|
converters: %i(nil),
|
|
skip_lines: /^[;, ]*$/,
|
|
col_sep: is_semicolon_delimited ? ";" : ","
|
|
}
|
|
|
|
if is_semicolon_delimited
|
|
csv_parse_options[:converters] << :decimal_comma_to_period
|
|
end
|
|
|
|
# using "foreach" rather than "parse" processes a chunk of the
|
|
# file at a time rather than loading the whole file into memory
|
|
# at once, a boon for memory consumption
|
|
CSV.foreach(csv_file.path, csv_parse_options) do |row|
|
|
yield row
|
|
end
|
|
end
|
|
|
|
def add_root_account_to_pseudonym_cache(root_account)
|
|
pseudonyms = root_account.shard.activate do
|
|
root_account.pseudonyms
|
|
.active
|
|
.select([:id, :unique_id, :sis_user_id, :user_id])
|
|
.where(:user_id => @all_students.values).to_a
|
|
end
|
|
pseudonyms.each do |pseudonym|
|
|
@pseudonyms_by_sis_id[[root_account.id, pseudonym.sis_user_id]] = pseudonym
|
|
@pseudonyms_by_login_id[[root_account.id, pseudonym.unique_id]] = pseudonym
|
|
end
|
|
end
|
|
|
|
def custom_columns_to_hash(cc)
|
|
{
|
|
id: cc.id,
|
|
title: cc.title,
|
|
read_only: cc.read_only,
|
|
}
|
|
end
|
|
|
|
def student_to_hash(student)
|
|
{
|
|
:last_name_first => student.last_name_first,
|
|
:name => student.name,
|
|
:previous_id => student.previous_id,
|
|
:id => student.id,
|
|
:submissions => @gradebook_importer_assignments[student.id],
|
|
:custom_column_data => @gradebook_importer_custom_columns[student.id]&.values
|
|
}
|
|
end
|
|
|
|
def assignment_to_hash(assignment)
|
|
{
|
|
:id => assignment.id,
|
|
:previous_id => assignment.previous_id,
|
|
:title => assignment.title,
|
|
:points_possible => assignment.points_possible,
|
|
:grading_type => assignment.grading_type
|
|
}
|
|
end
|
|
|
|
def valid_context?(context=nil)
|
|
context && [
|
|
:students,
|
|
:assignments,
|
|
:submissions,
|
|
:students=,
|
|
:assignments=,
|
|
:submissions=
|
|
].all?{ |m| context.respond_to?(m) }
|
|
end
|
|
|
|
def readonly_assignment?(index)
|
|
@pp_row[index] =~ /read\s+only/
|
|
end
|
|
|
|
private
|
|
|
|
def gradeable?(submission:, is_admin: false)
|
|
# `submission#grants_right?` will check if the user
|
|
# is an admin, but if we've pre-loaded that value already
|
|
# to avoid an N+1, check that first.
|
|
is_admin || submission.grants_right?(@user, :grade)
|
|
end
|
|
|
|
def no_change_to_column_values?(column_id:)
|
|
@students.all? do |student|
|
|
custom_column_datum = @gradebook_importer_custom_columns[student.id][column_id]
|
|
|
|
return true if custom_column_datum['current_content'].blank? && custom_column_datum['new_content'].blank?
|
|
custom_column_datum['current_content'] == custom_column_datum['new_content']
|
|
end
|
|
end
|
|
|
|
def exclude_custom_column_on_import(column:)
|
|
column.deleted? || column.read_only
|
|
end
|
|
end
|