23 lines
1.1 KiB
Ruby
23 lines
1.1 KiB
Ruby
class FixSubmissionVersionsIndex < ActiveRecord::Migration
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tag :postdeploy
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disable_ddl_transaction!
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def self.up
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if connection.adapter_name == 'PostgreSQL' && connection.select_value("SELECT 1 FROM pg_index WHERE indexrelid='index_submission_versions'::regclass AND NOT indisunique")
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columns = [:context_id, :version_id, :user_id, :assignment_id]
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SubmissionVersion.select(columns).where(context_type: 'Course').group(columns).having("COUNT(*) > 1").find_each do |sv|
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scope = SubmissionVersion.where(Hash[columns.map { |c| [c, sv[c]]}]).where(context_type: 'Course')
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keeper = scope.first
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scope.where("id<>?", keeper).delete_all
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end
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add_index :submission_versions, columns,
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:name => 'index_submission_versions2',
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:where => { :context_type => 'Course' },
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:unique => true,
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:algorithm => :concurrently
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connection.execute("DROP INDEX IF EXISTS index_submission_versions")
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rename_index :submission_versions, 'index_submission_versions2', 'index_submission_versions'
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end
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end
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end
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