diff options
Diffstat (limited to 'db')
| -rw-r--r-- | db/migrate/20190726175042_add_case_insensitive_index_to_tags.rb | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/db/migrate/20190726175042_add_case_insensitive_index_to_tags.rb b/db/migrate/20190726175042_add_case_insensitive_index_to_tags.rb index 6fa8c0ec4..057fc86ba 100644 --- a/db/migrate/20190726175042_add_case_insensitive_index_to_tags.rb +++ b/db/migrate/20190726175042_add_case_insensitive_index_to_tags.rb @@ -2,6 +2,19 @@ class AddCaseInsensitiveIndexToTags < ActiveRecord::Migration[5.2] disable_ddl_transaction! def up + Tag.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM tags GROUP BY lower(name) HAVING count(*) > 1').to_hash.each do |row| + canonical_tag_id = row['ids'].split(',').first + redundant_tag_ids = row['ids'].split(',')[1..-1] + + safety_assured do + 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)" + 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)" + 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)" + end + + Tag.where(id: redundant_tag_ids).in_batches.delete_all + end + safety_assured { execute 'CREATE UNIQUE INDEX CONCURRENTLY index_tags_on_name_lower ON tags (lower(name))' } remove_index :tags, name: 'index_tags_on_name' remove_index :tags, name: 'hashtag_search_index' |