NoMethodError: undefined method inject for String (when upgrading to 6.1.0)

[0xtobit]

I've been working on upgrading my rails app from 4.2 to Rails 5.0. I also upgraded rspec_api_documentation from 4.9.0 to 6.1.0 but I got this stack bomb when running my test suite. (I've included only the gem specific lines of the backtrace):

     NoMethodError:
       undefined method `inject' for #<String:0x00007fcdf10a91e8>
       Did you mean?  inspect
     # /Users/tobit/.gem/ruby/2.4.4/gems/rspec_api_documentation-6.1.0/lib/rspec_api_documentation/dsl/endpoint.rb:170:in `extra_params'
     # /Users/tobit/.gem/ruby/2.4.4/gems/rspec_api_documentation-6.1.0/lib/rspec_api_documentation/dsl/endpoint.rb:107:in `extended_parameters'
     # /Users/tobit/.gem/ruby/2.4.4/gems/rspec_api_documentation-6.1.0/lib/rspec_api_documentation/dsl/endpoint.rb:41:in `do_request'

I rolled back to 4.9.0 and haven't had this issue.

[pauloancheta]

+1 I'm seeing this too. For now I'm resolving it as commenting out the "Accept" and "Content-Type". Just to make my tests pass. But my documentation is invalid.

[viktorianer]

I get the same error with rails (6.0.0) and rspec_api_documentation (6.1.0).

[Tmee]

I hit this today on a new project running rails 6.0.2 and rspec_api_documentation 6.1.0

We found one work around to define the raw_post variable and call to_json on it. (documentation)

let(:raw_post) {
    { 
        user: { first_name: 'test' }
    }.to_json
}

---

Further research found that the default request_body_formatter is a Proc (source).
Adding the following to our config resolved the issue without the need to define raw_post.

RspecApiDocumentation.configure do |config|
  config.request_body_formatter = :json
end

That configuration setting can take :xml or a Proc also:

  # Change how the post body is formatted by default, you can still override by `raw_post`
  # Can be :json, :xml, or a proc that will be passed the params
  config.request_body_formatter = Proc.new { |params| params }