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# frozen_string_literal: true
module Gitlab
module Graphql
module Present
class Instrumentation
def instrument(type, field)
return field unless field.metadata[:type_class]
presented_in = field.metadata[:type_class].owner
return field unless presented_in.respond_to?(:presenter_class)
return field unless presented_in.presenter_class
old_resolver = field.resolve_proc
resolve_with_presenter = -> (presented_type, args, context) do
# We need to wrap the original presentation type into a type that
# uses the presenter as an object.
object = presented_type.object
if object.is_a?(presented_in.presenter_class)
next old_resolver.call(presented_type, args, context)
end
presenter = presented_in.presenter_class.new(object, **context.to_h)
wrapped = presented_type.class.new(presenter, context)
old_resolver.call(wrapped, args, context)
end
field.redefine do
resolve(resolve_with_presenter)
end
end
end
end
end
end
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