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Contents
# frozen_string_literal: true
module GraphQL
class Schema
# 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]
class PossibleTypes
def initialize(schema)
@object_types = schema.types.values.select { |type| type.kind.object? }
@interface_implementers = Hash.new do |hash, key|
hash[key] = @object_types.select { |type| type.interfaces.include?(key) }.sort_by(&:name)
end
end
def possible_types(type_defn)
case type_defn
when GraphQL::UnionType
type_defn.possible_types
when GraphQL::InterfaceType
@interface_implementers[type_defn]
when GraphQL::BaseType
[type_defn]
else
raise "Unexpected possible_types object: #{type_defn}"
end
end
end
end
end
Version data entries
52 entries across 52 versions & 1 rubygems