50 lines
2.1 KiB
Ruby
50 lines
2.1 KiB
Ruby
#
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# Copyright (C) 2014 - 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 CleanupDuplicateExternalFeeds < ActiveRecord::Migration[4.2]
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disable_ddl_transaction!
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tag :postdeploy
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def up
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uniq_fields = %w(context_id context_type url header_match verbosity)
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scope = ExternalFeed.group(uniq_fields).select(uniq_fields).having("COUNT(*) > 1")
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scope.find_each do |baddie|
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duplicate_scope = ExternalFeed.where(baddie.attributes.slice(*uniq_fields))
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keeper = duplicate_scope.order(:id).first.id
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duplicate_scope.where('id != ?', keeper).find_ids_in_batches do |id_batch|
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DiscussionTopic.where(external_feed_id: id_batch).update_all(external_feed_id: keeper)
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ExternalFeedEntry.where(external_feed_id: id_batch).delete_all
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ExternalFeed.where(id: id_batch).delete_all
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end
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end
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ExternalFeed.find_ids_in_ranges do |start_id, end_id|
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ExternalFeed.where(id: start_id..end_id).where(verbosity: nil).
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update_all(verbosity: 'full')
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end
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uniq_fields_without_header = uniq_fields - %w(header_match)
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add_index :external_feeds, uniq_fields_without_header, unique: true, algorithm: :concurrently, where: "header_match IS NULL", name: 'index_external_feeds_uniquely_1'
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add_index :external_feeds, uniq_fields, unique: true, algorithm: :concurrently, where: "header_match IS NOT NULL", name: 'index_external_feeds_uniquely_2'
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end
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def down
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remove_index :external_feeds, name: 'index_external_feeds_uniquely_1'
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remove_index :external_feeds, name: 'index_external_feeds_uniquely_2'
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end
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end
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