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YuruToot/db/migrate/20181207011115_downcase_custom_emoji_domains.rb

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# frozen_string_literal: true
class DowncaseCustomEmojiDomains < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
duplicates = CustomEmoji.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM custom_emojis GROUP BY shortcode, lower(domain) HAVING count(*) > 1').to_ary
duplicates.each do |row|
CustomEmoji.where(id: row['ids'].split(',')[0...-1]).destroy_all
end
CustomEmoji.in_batches.update_all('domain = lower(domain)')
end
def down; end
end