foreign_key_name

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 1266
      def foreign_key_name(table_name, options) # :nodoc:
        identifier = "#{table_name}_#{options.fetch(:column)}_fk"
        hashed_identifier = Digest::SHA256.hexdigest(identifier).first(10)
        options.fetch(:name) do
          "fk_rails_#{hashed_identifier}"
        end
      end