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class MigrateSettings < ActiveRecord::Migration[4.2]
def up
remove_index :settings, [:target_type, :target_id, :var]
rename_column :settings, :target_id, :thing_id
rename_column :settings, :target_type, :thing_type
change_column :settings, :thing_id, :integer, null: true, default: nil
change_column :settings, :thing_type, :string, null: true, default: nil
add_index :settings, [:thing_type, :thing_id, :var], unique: true
end
def down
remove_index :settings, [:thing_type, :thing_id, :var]
rename_column :settings, :thing_id, :target_id
rename_column :settings, :thing_type, :target_type
change_column :settings, :target_id, :integer, null: false
change_column :settings, :target_type, :string, null: false, default: ''
add_index :settings, [:target_type, :target_id, :var], unique: true
end
end
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