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# frozen_string_literal: true module GraphQL class Schema class Directive < GraphQL::Schema::Member # An example directive to show how you might interact with the runtime. # # This directive takes the return value of the tagged part of the query, # and if the named transform is whitelisted and applies to the return value, # it's applied by calling a method with that name. # # @example Installing the directive # class MySchema < GraphQL::Schema # directive(GraphQL::Schema::Directive::Transform) # end # # @example Transforming strings # viewer { # username @transform(by: "upcase") # } class Transform < Schema::Directive description "Directs the executor to run named transform on the return value." locations( GraphQL::Schema::Directive::FIELD, ) argument :by, String, description: "The name of the transform to run if applicable" TRANSFORMS = [ "upcase", "downcase", # ?? ] # Implement the Directive API def self.resolve(object, arguments, context) path = context.namespace(:interpreter)[:current_path] return_value = yield transform_name = arguments[:by] if TRANSFORMS.include?(transform_name) && return_value.respond_to?(transform_name) return_value = return_value.public_send(transform_name) response = context.namespace(:interpreter_runtime)[:runtime].final_result *keys, last = path keys.each do |key| if response && (response = response[key]) next else break end end if response response[last] = return_value end nil end end end end end end
Version data entries
88 entries across 88 versions & 1 rubygems