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# frozen_string_literal: true
module GraphQL
class Schema
class Union < GraphQL::Schema::Member
extend GraphQL::Schema::Member::HasUnresolvedTypeError
class << self
def inherited(child_class)
add_unresolved_type_error(child_class)
super
end
def possible_types(*types, context: GraphQL::Query::NullContext.instance, **options)
if types.any?
types.each do |t|
assert_valid_union_member(t)
type_memberships << type_membership_class.new(self, t, **options)
end
else
visible_types = []
warden = Warden.from_context(context)
type_memberships.each do |type_membership|
if warden.visible_type_membership?(type_membership, context)
visible_types << type_membership.object_type
end
end
visible_types
end
end
def all_possible_types
type_memberships.map(&:object_type)
end
def type_membership_class(membership_class = nil)
if membership_class
@type_membership_class = membership_class
else
@type_membership_class || find_inherited_value(:type_membership_class, GraphQL::Schema::TypeMembership)
end
end
def kind
GraphQL::TypeKinds::UNION
end
def type_memberships
@type_memberships ||= []
end
# Update a type membership whose `.object_type` is a string or late-bound type
# so that the type membership's `.object_type` is the given `object_type`.
# (This is used for updating the union after the schema as lazily loaded the union member.)
# @api private
def assign_type_membership_object_type(object_type)
assert_valid_union_member(object_type)
type_memberships.each { |tm|
possible_type = tm.object_type
if possible_type.is_a?(String) && (possible_type == object_type.name)
# This is a match of Ruby class names, not graphql names,
# since strings are used to refer to constants.
tm.object_type = object_type
elsif possible_type.is_a?(LateBoundType) && possible_type.graphql_name == object_type.graphql_name
tm.object_type = object_type
end
}
nil
end
private
def assert_valid_union_member(type_defn)
case type_defn
when Class
if !type_defn.kind.object?
raise ArgumentError, "Union possible_types can only be object types (not #{type_defn.kind.name}, #{type_defn.inspect})"
end
when Module
# it's an interface type, defined as a module
raise ArgumentError, "Union possible_types can only be object types (not interface types), remove #{type_defn.graphql_name} (#{type_defn.inspect})"
when String, GraphQL::Schema::LateBoundType
# Ok - assume it will get checked later
else
raise ArgumentError, "Union possible_types can only be class-based GraphQL types (not #{type_defn.inspect} (#{type_defn.class.name}))."
end
end
end
end
end
end
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