module ActiveRecord::Migration::JoinTable

def find_join_table_name(table_1, table_2, options = {})
  options.delete(:table_name) || join_table_name(table_1, table_2)
end

def join_table_name(table_1, table_2)
  ModelSchema.derive_join_table_name(table_1, table_2).to_sym
end