Class: GraphQL::Schema::Validation

Inherits:

Object

• Object
• GraphQL::Schema::Validation

Defined in:

lib/graphql/schema/validation.rb

Overview

This module provides a function for validating GraphQL types.

Its RULES contain objects that respond to ‘#call(type)`. Rules are looked up for given types (by class ancestry), then applied to the object until an error is returned.

Defined Under Namespace

Modules: Rules

Constant Summary

RULES =

A mapping of ‘=> [Proc, Proc…]` pairs. To validate an instance, find entries where `object.is_a?(key)` is true. Then apply each rule from the matching values.

{
  GraphQL::Field => [
    Rules::NAME_IS_STRING,
    Rules::DESCRIPTION_IS_STRING_OR_NIL,
    Rules.assert_property(:deprecation_reason, String, NilClass),
    Rules.assert_property(:type, GraphQL::BaseType),
    Rules.assert_property(:property, Symbol, NilClass),
    Rules::ARGUMENTS_ARE_STRING_TO_ARGUMENT,
    Rules::ARGUMENTS_ARE_VALID,
  ],
  GraphQL::Argument => [
    Rules::NAME_IS_STRING,
    Rules::DESCRIPTION_IS_STRING_OR_NIL,
    Rules::TYPE_IS_VALID_INPUT_TYPE,
    Rules::DEFAULT_VALUE_IS_VALID_FOR_TYPE,
  ],
  GraphQL::BaseType => [
    Rules::NAME_IS_STRING,
    Rules::DESCRIPTION_IS_STRING_OR_NIL,
  ],
  GraphQL::ObjectType => [
    Rules.assert_property_list_of(:interfaces, GraphQL::InterfaceType),
    Rules::FIELDS_ARE_VALID,
  ],
  GraphQL::InputObjectType => [
    Rules::ARGUMENTS_ARE_STRING_TO_ARGUMENT,
    Rules::ARGUMENTS_ARE_VALID,
  ],
  GraphQL::UnionType => [
    Rules.assert_property_list_of(:possible_types, GraphQL::ObjectType),
    Rules::HAS_ONE_OR_MORE_POSSIBLE_TYPES,
  ],
  GraphQL::InterfaceType => [
    Rules::FIELDS_ARE_VALID,
  ],
  GraphQL::Schema => [
    Rules::SCHEMA_CAN_RESOLVE_TYPES,
    Rules::SCHEMA_CAN_FETCH_IDS,
    Rules::SCHEMA_CAN_GENERATE_IDS,
  ],
}

Class Method Summary

• .validate(object) ⇒ String, Nil

  Lookup the rules for ‘object` based on its class, Then returns an error message or `nil`.

Class Method Details

.validate(object) ⇒ String, Nil

Lookup the rules for ‘object` based on its class, Then returns an error message or `nil`

Parameters:

• object (Object) —

  something to be validated

Returns:

• (String, Nil) —

  error message, if there was one

# File 'lib/graphql/schema/validation.rb', line 13

def self.validate(object)
  rules = RULES.reduce([]) do |memo, (parent_class, validations)|
    memo + (object.is_a?(parent_class) ? validations : [])
  end
  # Stops after the first error
  rules.reduce(nil) { |memo, rule| memo || rule.call(object) }
end