Including Rails path helper causes exception in initializer

[Jan Hecking]

I've mounted my Grape API(s) under Rails and would like to use Rails' path helpers. I followed the how-to at https://github.com/intridea/grape/wiki/Grape-and-Rails-Path-Helpers and copied the code into an initializer verbatim. However when I start Rails I get the following exception:

railties-3.2.12/lib/rails/railtie/configuration.rb:85:in `method_missing': undefined method `routes' for #<Rails::Application::Configuration:0x007fac57fb80f0> (NoMethodError)

from config/initializers/grape.rb:22:in `<class:Endpoint>'

from config/initializers/grape.rb:20:in `<module:Grape>'

from config/initializers/grape.rb:19:in `<top (required)>'

from activesupport-3.2.12/lib/active_support/dependencies.rb:245:in `load'

        ...

Including Rails.application.routes.url_helpers directly in my Grape::API subclass does work. But when I want to use a method such as root_url it still throws an unknown method error:

NameError - undefined local variable or method `root_url' for API::Partner:Class:

  app/api/partner.rb:9:in `<class:Partner>'

  app/api/partner.rb:2:in `<module:API>'

  app/api/partner.rb:1:in `<top (required)>'

Any tips for how to get the url_helpers working in Grape? We're running Rails 3.2.12 in case that's relevant. 

Jan

[Daniel Doubrovkine]

This is a total guess, but I think it's a bug and was introduced in https://github.com/intridea/grape/pull/269.

Can you please write this up as an issue? A test reproducing the problem would be awesome, too.

Jan

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[Marcus Geißler]

I'm facing the same error for the grape 0.4 used in a rails 3.2.12 app.

[a...@substantial.com]

I was able to fix this with the following code:

module Grape

  class Endpoint

    include Rails.application.routes.url_helpers

    default_url_options[:host] = ::Rails.application.routes.default_url_options[:host] || "www.example.com"

  end

end

I think the key is that Rails.application.config.routes should be Rails.application.routes

[Jan Hecking]

Thanks! So it was just a simple typo... Good job catching this - I started at this code for dont-know-how-long and didn't notice the default_url_options call was plain wrong.

I've updated the Grape wiki to fix this error as well.

Cheers,

Jan

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