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Grape 3.1.0 breaks compatibility w/ grape-swagger 2.1.3 #971
Description
Grape 3.1.0 breaks compatibility w/ grape-swagger
I.e.
NoMethodError (undefined method `success' for nil:NilClass):
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:158:in `produces_object'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:121:in `method_object'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:105:in `block in path_item'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:99:in `each'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:99:in `path_item'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:85:in `block in path_and_definition_objects'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:84:in `each_value'
grape-swagger (2.1.3) lib/grape-swagger/endpoint.rb:84:in `path_and_definition_objects'
grape-swagger (2.1.3) lib/grape-swagger/doc_methods.rb:52:in `output_path_definitions'
grape-swagger (2.1.3) lib/grape-swagger/doc_methods.rb:105:in `block in setup'
grape (3.1.0) lib/grape/endpoint.rb:202:in `bind_call'
grape (3.1.0) lib/grape/endpoint.rb:202:in `block in execute'
activesupport (7.2.3) lib/active_support/notifications.rb:210:in `block in instrument'
activesupport (7.2.3) lib/active_support/notifications/instrumenter.rb:58:in `instrument'
activesupport (7.2.3) lib/active_support/notifications.rb:210:in `instrument'
grape (3.1.0) lib/grape/endpoint.rb:201:in `execute'
grape (3.1.0) lib/grape/endpoint.rb:179:in `block in run'
activesupport (7.2.3) lib/active_support/notifications.rb:210:in `block in instrument'
activesupport (7.2.3) lib/active_support/notifications/instrumenter.rb:58:in `instrument'
activesupport (7.2.3) lib/active_support/notifications.rb:210:in `instrument'
grape (3.1.0) lib/grape/endpoint.rb:161:in `run'
grape (3.1.0) lib/grape/endpoint.rb:355:in `block in build_stack'
grape (3.1.0) lib/grape/middleware/base.rb:26:in `call!'
Whereas 3.0.1 works fine.
Reacted by Andrei Subbota
Activity
numbata commentedon Jan 27, 2026
Thanks for the report @wgwz, and for including the full stack trace and version details - very helpful!
I'll investigate the Grape 3.1.0 changes and get back with a fix.
wgwz commentedon Jan 27, 2026
I can add more context if helpful, it's a pretty minimal configuration I'm using.
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