31 lines
1.2 KiB
Ruby
31 lines
1.2 KiB
Ruby
#
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# Copyright (C) 2016 - 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 AddGeneratedQuizQuestionUniquenessIndex < ActiveRecord::Migration[4.2]
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tag :predeploy
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disable_ddl_transaction!
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def change
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add_column :quiz_questions, :duplicate_index, :integer
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add_index :quiz_questions, [:assessment_question_id, :quiz_group_id, :duplicate_index],
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name: "index_generated_quiz_questions",
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where: "assessment_question_id IS NOT NULL AND quiz_group_id IS NOT NULL AND workflow_state='generated'",
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unique: true,
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algorithm: :concurrently
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end
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end
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