core/db/migrate/20140213113405_create_grading_method_connectors_table.rb
class CreateGradingMethodConnectorsTable < ActiveRecord::Migration[4.2]
def change
create_table :gaku_grading_method_connectors do |t|
t.references :grading_method
t.references :gradable, polymorphic: true
t.integer :position
end
end
end