Module: GraphQL::Schema::Validation::Rules

Defined in:
lib/graphql/schema/validation.rb

Constant Summary collapse

FIELDS_ARE_VALID =
Rules.assert_named_items_are_valid("field", ->(type) { type.all_fields })
HAS_ONE_OR_MORE_POSSIBLE_TYPES =
->(type) {
  type.possible_types.length >= 1 ? nil : "must have at least one possible type"
}
NAME_IS_STRING =
Rules.assert_property(:name, String)
DESCRIPTION_IS_STRING_OR_NIL =
Rules.assert_property(:description, String, NilClass)
ARGUMENTS_ARE_STRING_TO_ARGUMENT =
Rules.assert_property_mapping(:arguments, String, GraphQL::Argument)
ARGUMENTS_ARE_VALID =
Rules.assert_named_items_are_valid("argument", ->(type) { type.arguments.values })
DEFAULT_VALUE_IS_VALID_FOR_TYPE =
->(type) {
  if !type.default_value.nil? && type.type.is_a?(NonNullType)
    return %Q(Variable #{type.name} of type "#{type.type}" is required and will not use the default value. Perhaps you meant to use type "#{type.type.of_type}".)
  end

  if !type.default_value.nil?
    coerced_value = begin
      type.type.coerce_isolated_result(type.default_value)
    rescue => ex
      ex
    end

    if coerced_value.nil? || coerced_value.is_a?(StandardError)
      msg = "default value #{type.default_value.inspect} is not valid for type #{type.type}"
      msg += " (#{coerced_value})" if coerced_value.is_a?(StandardError)
      msg
    end
  end
}
TYPE_IS_VALID_INPUT_TYPE =
->(type) {
  outer_type = type.type
  inner_type = outer_type.is_a?(GraphQL::BaseType) ? outer_type.unwrap : nil

  case inner_type
  when GraphQL::ScalarType, GraphQL::InputObjectType, GraphQL::EnumType
    # OK
  else
    "type must be a valid input type (Scalar or InputObject), not #{outer_type.class} (#{outer_type})"
  end
}
SCHEMA_CAN_RESOLVE_TYPES =
->(schema) {
  if schema.types.values.any? { |type| type.kind.resolves? } && schema.resolve_type_proc.nil?
    "schema contains Interfaces or Unions, so you must define a `resolve_type -> (obj, ctx) { ... }` function"
  else
    # :+1:
  end
}
SCHEMA_CAN_FETCH_IDS =
->(schema) {
  has_node_field = schema.query && schema.query.all_fields.any?(&:relay_node_field)
  if has_node_field && schema.object_from_id_proc.nil?
    "schema contains `node(id:...)` field, so you must define a `object_from_id -> (id, ctx) { ... }` function"
  else
    # :rocket:
  end
}
SCHEMA_CAN_GENERATE_IDS =
->(schema) {
  has_id_field = schema.types.values.any? { |t| t.kind.fields? && t.all_fields.any? { |f| f.resolve_proc.is_a?(GraphQL::Relay::GlobalIdResolve) } }
  if has_id_field && schema.id_from_object_proc.nil?
    "schema contains `global_id_field`, so you must define a `id_from_object -> (obj, type, ctx) { ... }` function"
  else
    # :ok_hand:
  end
}
SCHEMA_INSTRUMENTERS_ARE_VALID =
->(schema) {
  errs = []
  schema.instrumenters[:query].each do |inst|
    if !inst.respond_to?(:before_query) || !inst.respond_to?(:after_query)
      errs << "`instrument(:query, #{inst})` is invalid: must respond to `before_query(query)` and `after_query(query)` "
    end
  end

  schema.instrumenters[:field].each do |inst|
    if !inst.respond_to?(:instrument)
      errs << "`instrument(:field, #{inst})` is invalid: must respond to `instrument(type, field)`"
    end
  end

  if errs.any?
    errs.join("Invalid instrumenters:\n" + errs.join("\n"))
  else
    nil
  end
}
RESERVED_TYPE_NAME =
->(type) {
  if type.name.start_with?('__') && !type.introspection?
    # TODO: make this a hard failure in a later version
    warn("Name #{type.name.inspect} must not begin with \"__\", which is reserved by GraphQL introspection.")
    nil
  else
    # ok name
  end
}
RESERVED_NAME =
->(named_thing) {
  if named_thing.name.start_with?('__')
    # TODO: make this a hard failure in a later version
    warn("Name #{named_thing.name.inspect} must not begin with \"__\", which is reserved by GraphQL introspection.")
    nil
  else
    # no worries
  end
}
INTERFACES_ARE_IMPLEMENTED =
->(obj_type) {
  field_errors = []
  obj_type.interfaces.each do |interface_type|
    interface_type.fields.each do |field_name, field_defn|
      object_field = obj_type.get_field(field_name)
      if object_field.nil?
        field_errors << %|"#{field_name}" is required by #{interface_type.name} but not implemented by #{obj_type.name}|
      elsif !GraphQL::Execution::Typecast.subtype?(field_defn.type, object_field.type)
        field_errors << %|"#{field_name}" is required by #{interface_type.name} to return #{field_defn.type} but #{obj_type.name}.#{field_name} returns #{object_field.type}|
      else
        field_defn.arguments.each do |arg_name, arg_defn|
          object_field_arg = object_field.arguments[arg_name]
          if object_field_arg.nil?
            field_errors << %|"#{arg_name}" argument is required by #{interface_type.name}.#{field_name} but not accepted by #{obj_type.name}.#{field_name}|
          elsif arg_defn.type != object_field_arg.type
            field_errors << %|"#{arg_name}" is required by #{interface_type.name}.#{field_defn.name} to accept #{arg_defn.type} but #{obj_type.name}.#{field_name} accepts #{object_field_arg.type} for "#{arg_name}"|
          end
        end

        object_field.arguments.each do |arg_name, arg_defn|
          if field_defn.arguments[arg_name].nil? && arg_defn.type.is_a?(GraphQL::NonNullType)
            field_errors << %|"#{arg_name}" is not accepted by #{interface_type.name}.#{field_name} but required by #{obj_type.name}.#{field_name}|
          end
        end
      end
    end
  end
  if field_errors.any?
    "#{obj_type.name} failed to implement some interfaces: #{field_errors.join(", ")}"
  else
    nil
  end
}

Class Method Summary collapse

Class Method Details

.assert_named_items_are_valid(item_name, get_items_proc) ⇒ Object


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# File 'lib/graphql/schema/validation.rb', line 74

def self.assert_named_items_are_valid(item_name, get_items_proc)
  ->(type) {
    items = get_items_proc.call(type)
    error_message = nil
    items.each do |item|
      item_message = GraphQL::Schema::Validation.validate(item)
      if item_message
        error_message = "#{item_name} #{item.name.inspect} #{item_message}"
        break
      end
    end
    error_message
  }
end

.assert_property(property_name, *allowed_classes) ⇒ Proc

Returns A proc which will validate the input by calling property_name and asserting it is an instance of one of allowed_classes

Parameters:

  • property_name (Symbol)

    The method to validate

  • allowed_classes (Class)

    Classes which the return value may be an instance of

Returns:

  • (Proc)

    A proc which will validate the input by calling property_name and asserting it is an instance of one of allowed_classes


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# File 'lib/graphql/schema/validation.rb', line 26

def self.assert_property(property_name, *allowed_classes)
  allowed_classes_message = allowed_classes.map(&:name).join(" or ")
  ->(obj) {
    property_value = obj.public_send(property_name)
    is_valid_value = allowed_classes.any? { |allowed_class| property_value.is_a?(allowed_class) }
    is_valid_value ? nil : "#{property_name} must return #{allowed_classes_message}, not #{property_value.class.name} (#{property_value.inspect})"
  }
end

.assert_property_list_of(property_name, list_member_class) ⇒ Proc

Returns A proc to validate the input by calling property_name and asserting that the return is an Array of list_member_class instances

Parameters:

  • property_name (Symbol)

    The method whose return value will be validated

  • list_member_class (Class)

    The class which each member of the returned array should be an instance of

Returns:

  • (Proc)

    A proc to validate the input by calling property_name and asserting that the return is an Array of list_member_class instances


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# File 'lib/graphql/schema/validation.rb', line 58

def self.assert_property_list_of(property_name, list_member_class)
  ->(obj) {
    property_value = obj.public_send(property_name)
    if !property_value.is_a?(Array)
      "#{property_name} must be an Array of #{list_member_class.name}, not a #{property_value.class.name} (#{property_value.inspect})"
    else
      invalid_member = property_value.find { |value| !value.is_a?(list_member_class) }
      if invalid_member
        "#{property_name} must contain #{list_member_class.name}, not #{invalid_member.class.name} (#{invalid_member.inspect})"
      else
        nil # OK
      end
    end
  }
end

.assert_property_mapping(property_name, from_class, to_class) ⇒ Proc

Returns A proc to validate that validates the input by calling property_name and asserting that the return value is a Hash of {from_class => to_class} pairs

Parameters:

  • property_name (Symbol)

    The method whose return value will be validated

  • from_class (Class)

    The class for keys in the return value

  • to_class (Class)

    The class for values in the return value

Returns:

  • (Proc)

    A proc to validate that validates the input by calling property_name and asserting that the return value is a Hash of {from_class => to_class} pairs


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# File 'lib/graphql/schema/validation.rb', line 39

def self.assert_property_mapping(property_name, from_class, to_class)
  ->(obj) {
    property_value = obj.public_send(property_name)
    if !property_value.is_a?(Hash)
      "#{property_name} must be a hash of {#{from_class.name} => #{to_class.name}}, not a #{property_value.class.name} (#{property_value.inspect})"
    else
      invalid_key, invalid_value = property_value.find { |key, value| !key.is_a?(from_class) || !value.is_a?(to_class) }
      if invalid_key
        "#{property_name} must map #{from_class} => #{to_class}, not #{invalid_key.class.name} => #{invalid_value.class.name} (#{invalid_key.inspect} => #{invalid_value.inspect})"
      else
        nil # OK
      end
    end
  }
end