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|
# frozen_string_literal: true
module Resolvers
class BaseResolver < GraphQL::Schema::Resolver
extend ::Gitlab::Utils::Override
include ::Gitlab::Utils::StrongMemoize
include ::Gitlab::Graphql::GlobalIDCompatibility
argument_class ::Types::BaseArgument
def self.requires_argument!
@requires_argument = true
end
def self.calls_gitaly!
@calls_gitaly = true
end
def self.field_options
extra_options = {
requires_argument: @requires_argument,
calls_gitaly: @calls_gitaly
}.compact
super.merge(extra_options)
end
def self.singular_type
return unless type
unwrapped = type.unwrap
%i[node_type relay_node_type of_type itself].reduce(nil) do |t, m|
t || unwrapped.try(m)
end
end
def self.when_single(&block)
as_single << block
# Have we been called after defining the single version of this resolver?
@single.instance_exec(&block) if @single.present?
end
def self.as_single
@as_single ||= []
end
def self.single_definition_blocks
ancestors.flat_map { |klass| klass.try(:as_single) || [] }
end
def self.single
@single ||= begin
parent = self
klass = Class.new(self) do
type parent.singular_type, null: true
def ready?(**args)
ready, early_return = super
[ready, select_result(early_return)]
end
def resolve(**args)
select_result(super)
end
def single?
true
end
def select_result(results)
results&.first
end
define_singleton_method :to_s do
"#{parent}.single"
end
end
single_definition_blocks.each do |definition|
klass.instance_exec(&definition)
end
klass
end
end
def self.last
parent = self
@last ||= Class.new(single) do
type parent.singular_type, null: true
def select_result(results)
results&.last
end
define_singleton_method :to_s do
"#{parent}.last"
end
end
end
def self.complexity
0
end
def self.resolver_complexity(args, child_complexity:)
complexity = 1
complexity += 1 if args[:sort]
complexity += 5 if args[:search]
complexity
end
def self.complexity_multiplier(args)
# When fetching many items, additional complexity is added to the field
# depending on how many items is fetched. For each item we add 1% of the
# original complexity - this means that loading 100 items (our default
# maxp_age_size limit) doubles the original complexity.
#
# Complexity is not increased when searching by specific ID(s), because
# complexity difference is minimal in this case.
[args[:iid], args[:iids]].any? ? 0 : 0.01
end
def offset_pagination(relation)
::Gitlab::Graphql::Pagination::OffsetPaginatedRelation.new(relation)
end
override :object
def object
super.tap do |obj|
# If the field this resolver is used in is wrapped in a presenter, unwrap its subject
break obj.subject if obj.is_a?(Gitlab::View::Presenter::Base)
end
end
def single?
false
end
def current_user
context[:current_user]
end
# Overridden in sub-classes (see .single, .last)
def select_result(results)
results
end
def self.authorization
@authorization ||= ::Gitlab::Graphql::Authorize::ObjectAuthorization.new(try(:required_permissions))
end
def self.authorized?(object, context)
authorization.ok?(object, context[:current_user])
end
end
end
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