class GraphQL::Schema::PossibleTypes
Find the members of a union or interface within a given schema.
(Although its members never change, unions are handled this way to simplify execution code.)
Internally, the calculation is cached. It's assumed that schema members _don't_ change after creating the schema!
@example Get an interface's possible types
possible_types = GraphQL::Schema::PossibleTypes(MySchema) possible_types.possible_types(MyInterface) # => [MyObjectType, MyOtherObjectType]
Public Class Methods
new(schema)
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# File lib/graphql/schema/possible_types.rb, line 15 def initialize(schema) @object_types = schema.types.values.select { |type| type.kind.object? } @interface_implementers = Hash.new do |h1, ctx| h1[ctx] = Hash.new do |h2, int_type| h2[int_type] = @object_types.select { |type| type.interfaces(ctx).include?(int_type) }.sort_by(&:name) end end end
Public Instance Methods
interface_implementers(ctx, type_defn)
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# File lib/graphql/schema/possible_types.rb, line 39 def interface_implementers(ctx, type_defn) @interface_implementers[ctx][type_defn] end
possible_types(type_defn, ctx)
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# File lib/graphql/schema/possible_types.rb, line 24 def possible_types(type_defn, ctx) case type_defn when Module possible_types(type_defn.graphql_definition, ctx) when GraphQL::UnionType type_defn.possible_types(ctx) when GraphQL::InterfaceType interface_implementers(ctx, type_defn) when GraphQL::BaseType [type_defn] else raise "Unexpected possible_types object: #{type_defn.inspect}" end end