Grape Swagger UI - Uncaught TypeError: Cannot read property 'definitions' of null

Question

So I came to this error when using Swagger UI and trying to hit the API.

Uncaught TypeError: Cannot read property 'definitions' of null

I'm using the gem grape-swagger and the UI says is trying to retrieve the records.

Answer 1

Issue was, another member of the team had commented the line

add_swagger_documentation api_version: 'v1', mount_path: '/docs'

that must be placed in the class AFTER all the mounted APIs

class Root < Grape::API
  blah blah blah...
  mount BLAH::BLAH
  mount FOO::BAR
  add_swagger_documentation api_version: 'v1', mount_path: '/docs'
end

After putting it there again it worked!