67 lines
1.9 KiB
Ruby
67 lines
1.9 KiB
Ruby
class GradesPresenter
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def initialize(enrollments)
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@enrollments = enrollments
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end
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def student_enrollments
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@student_enrollments ||= begin
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current_enrollments.select { |e| e.student? }.index_by { |e| e.course }
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end
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end
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def observed_enrollments
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@observed_enrollments ||= begin
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observer_enrollments.map { |e|
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e.shard.activate do
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StudentEnrollment.active.where(user_id: e.associated_user_id, course_id: e.course_id).first
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end
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}.uniq.compact
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end
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end
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def course_grade_summaries
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@course_grade_summaries ||= begin
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teacher_enrollments.each_with_object({}) do |e, hash|
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hash[e.course_id] = e.shard.activate do
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Rails.cache.fetch(['computed_avg_grade_for', e.course].cache_key) do
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current_scores = e.course.student_enrollments.not_fake.group(:user_id).maximum(:computed_current_score).values.compact
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score = (current_scores.sum.to_f * 100.0 / current_scores.length.to_f).round.to_f / 100.0 rescue nil
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{:score => score, :students => current_scores.length }
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end
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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 teacher_enrollments
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@teacher_enrollments ||= current_enrollments.select { |e| e.instructor? }.index_by { |e| e.course }.values
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end
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def prior_enrollments
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[]
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end
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def has_single_enrollment?
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student_enrollments.length + teacher_enrollments.length + observed_enrollments.length == 1
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end
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def single_enrollment
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student_enrollments.values.first || teacher_enrollments.first || observed_enrollments.first
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end
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private
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def observer_enrollments
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@observer_enrollments ||= begin
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current_enrollments.select { |e| e.is_a?(ObserverEnrollment) && e.associated_user_id }
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end
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end
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def current_enrollments
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@current_enrollments ||= begin
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@enrollments.select { |e| e.state_based_on_date == :active }
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end
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end
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end
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