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