Method: GraphQL::Schema::Interface::DefinitionMethods#included

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

#included(child_class) ⇒ Object

Here's the tricky part. Make sure behavior keeps making its way down the inheritance chain.



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# File 'lib/graphql/schema/interface.rb', line 50

def included(child_class)
  if !child_class.is_a?(Class)
    # In this case, it's been included into another interface.
    # This is how interface inheritance is implemented

    # We need this before we can call `own_interfaces`
    child_class.extend(Schema::Interface::DefinitionMethods)

    child_class.type_membership_class(self.type_membership_class)
    child_class.ancestors.reverse_each do |ancestor|
      if ancestor.const_defined?(:DefinitionMethods) && ancestor != child_class
        child_class.extend(ancestor::DefinitionMethods)
      end
    end

    child_class.introspection(introspection)
    child_class.description(description)
    child_class.comment(nil)
    # If interfaces are mixed into each other, only define this class once
    if !child_class.const_defined?(:UnresolvedTypeError, false)
      add_unresolved_type_error(child_class)
    end
  elsif child_class < GraphQL::Schema::Object
    # This is being included into an object type, make sure it's using `implements(...)`
    backtrace_line = caller_locations(0, 10).find do |location|
      location.base_label == "implements" &&
        location.path.end_with?("schema/member/has_interfaces.rb")
    end

    if !backtrace_line
      raise "Attach interfaces using `implements(#{self})`, not `include(#{self})`"
    end
  end

  super
end