Created
April 5, 2017 18:23
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RescueInstrumentation
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| # This piggy-backs off RescueMiddleware by using the same exception handling | |
| # rules you've defined using rescue_from(), and applying them to lazy fields | |
| # (which would otherwise run after middleware has been run). | |
| # Add this to your schema: | |
| # | |
| # instrument(:field, RescueInstrumentation.new) | |
| # | |
| class RescueInstrumentation | |
| def instrument(type, field) | |
| old_lazy_resolve_proc = field.lazy_resolve_proc | |
| new_lazy_resolve_proc = ->(obj, args, ctx) { | |
| resolved = begin | |
| old_lazy_resolve_proc.call(obj, args, ctx) | |
| rescue StandardError => err | |
| attempt_rescue(err) | |
| end | |
| resolved | |
| } | |
| field.redefine do | |
| lazy_resolve(new_lazy_resolve_proc) | |
| end | |
| end | |
| private def attempt_rescue(err) | |
| handler = GraphSchema.send(:rescue_middleware).rescue_table[err.class] | |
| if handler | |
| message = handler.call(err) | |
| GraphQL::ExecutionError.new(message) | |
| else | |
| raise(err) | |
| end | |
| end | |
| end |
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