hometown/db/migrate/20161006213403_rails_settin...

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MIGRATION_BASE_CLASS = if ActiveRecord::VERSION::MAJOR >= 5
ActiveRecord::Migration[5.0]
else
ActiveRecord::Migration
end
class RailsSettingsMigration < MIGRATION_BASE_CLASS
def self.up
create_table :settings do |t|
t.string :var, :null => false
t.text :value
t.references :target, :null => false, :polymorphic => true
t.timestamps :null => true
end
add_index :settings, [ :target_type, :target_id, :var ], :unique => true
end
def self.down
drop_table :settings
end
end