graphql_controller_mixin.rb

module DevmakerRailsSdk
  module GraphqlControllerMixin
    def execute
      result = params[:_json] ? multiplex_execution(params) : single_execution(params)
      render json: result
    rescue => e
      raise e unless Rails.env.development?
      handle_error_in_development e
    end

    def variables
      ensure_hash(params[:variables])
    end

    def context
      {}
    end

    def schema
      nil
    end

    protected

    def single_execution(params)
      schema.execute(params[:query], variables: variables, context: context, operation_name: params[:operationName])
    end

    def multiplex_execution(params)
      queries = params[:_json].map do |param|
        {
          query: param[:query],
          operation_name: param[:operationName],
          variables: variables,
          context: context,
        }
      end

      schema.multiplex(queries)
    end

    # Handle form data, JSON body, or a blank value
    def ensure_hash(ambiguous_param)
      case ambiguous_param
      when String
        if ambiguous_param.present?
          ensure_hash(JSON.parse(ambiguous_param))
        else
          {}
        end
      when Hash, ActionController::Parameters
        ambiguous_param
      when nil
        {}
      else
        raise ArgumentError, "Unexpected parameter: #{ambiguous_param}"
      end
    end

    def handle_error_in_development(e)
      logger.error e.message
      logger.error e.backtrace.join("\n")

      render json: { error: { message: e.message, backtrace: e.backtrace }, data: {} }, status: 500
    end
  end
end