43 lines
1.5 KiB
Ruby
43 lines
1.5 KiB
Ruby
#
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# Copyright (C) 2012 - 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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class PurgeDuplicateDeletedSisEnrollments < ActiveRecord::Migration[4.2]
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tag :predeploy
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disable_ddl_transaction!
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def self.up
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while true
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pairs = Enrollment.connection.select_rows("
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SELECT user_id, course_section_id, type
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FROM #{Enrollment.quoted_table_name}
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WHERE workflow_state='deleted' AND sis_source_id IS NOT NULL
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GROUP BY user_id, course_section_id, type
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HAVING count(*) > 1 LIMIT 1000")
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break if pairs.empty?
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pairs.each do |(user_id, course_section_id, type)|
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scope = Enrollment.where("user_id=? AND course_section_id=? AND type=? AND sis_source_id IS NOT NULL AND workflow_state='deleted'", user_id.to_i, course_section_id.to_i, type)
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keeper = scope.limit(1).pluck(:id).first
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scope.where("id<>?", keeper).delete_all
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end
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end
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end
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def self.down
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end
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end
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