ref: master
db/migrate/20140115190132_add_missing_unique_indices.acts_as_taggable_on_engine.rb
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# This migration comes from acts_as_taggable_on_engine (originally 2) class AddMissingUniqueIndices < ActiveRecord::Migration def self.up add_index :tags, :name, unique: true remove_index :taggings, :tag_id remove_index :taggings, [:taggable_id, :taggable_type, :context] add_index :taggings, [:tag_id, :taggable_id, :taggable_type, :context, :tagger_id, :tagger_type], unique: true, name: 'taggings_idx' end def self.down remove_index :tags, :name remove_index :taggings, name: 'taggings_idx' add_index :taggings, :tag_id add_index :taggings, [:taggable_id, :taggable_type, :context] end end |