You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
1.8 KiB
34 lines
1.8 KiB
class AddCaseInsensitiveIndexToTags < ActiveRecord::Migration[5.2]
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disable_ddl_transaction!
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def up
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Tag.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM tags GROUP BY lower(name) HAVING count(*) > 1').to_ary.each do |row|
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canonical_tag_id = row['ids'].split(',').first
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redundant_tag_ids = row['ids'].split(',')[1..-1]
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safety_assured do
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execute "UPDATE accounts_tags AS t0 SET tag_id = #{canonical_tag_id} WHERE tag_id IN (#{redundant_tag_ids.join(', ')}) AND NOT EXISTS (SELECT t1.tag_id FROM accounts_tags AS t1 WHERE t1.tag_id = #{canonical_tag_id} AND t1.account_id = t0.account_id)"
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execute "UPDATE statuses_tags AS t0 SET tag_id = #{canonical_tag_id} WHERE tag_id IN (#{redundant_tag_ids.join(', ')}) AND NOT EXISTS (SELECT t1.tag_id FROM statuses_tags AS t1 WHERE t1.tag_id = #{canonical_tag_id} AND t1.status_id = t0.status_id)"
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execute "UPDATE featured_tags AS t0 SET tag_id = #{canonical_tag_id} WHERE tag_id IN (#{redundant_tag_ids.join(', ')}) AND NOT EXISTS (SELECT t1.tag_id FROM featured_tags AS t1 WHERE t1.tag_id = #{canonical_tag_id} AND t1.account_id = t0.account_id)"
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end
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Tag.where(id: redundant_tag_ids).in_batches.delete_all
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end
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begin
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safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower ON tags (lower(name))' }
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rescue ActiveRecord::StatementInvalid
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remove_index :tags, name: 'index_tags_on_name_lower'
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raise
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end
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remove_index :tags, name: 'index_tags_on_name'
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remove_index :tags, name: 'hashtag_search_index'
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end
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def down
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add_index :tags, :name, unique: true, algorithm: :concurrently
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safety_assured { execute 'CREATE INDEX CONCURRENTLY hashtag_search_index ON tags (name text_pattern_ops)' }
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remove_index :tags, name: 'index_tags_on_name_lower'
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end
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end
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