NoMethodError: undefined method in routes_with_grape - ruby-on-rails

Question

I am trying to set up a rails grape api with the below structure.
app
api
api
V1
user.rb
app.rb
I am getting this error when i run routes_with_grape
rake aborted!
NoMethodError: undefined method `ast' for "/api/ping(.json)":String
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/actionpack-4.2.1/lib/action_dispatch/journey/path/pattern.rb:14:in `initialize'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:9:in `new'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:9:in `block (3 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:8:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:8:in `block (2 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:6:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/grape-rails-routes-1.0/lib/rails/tasks/routes_with_grape.rake:6:in `block in <top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p551/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-1.9.3-p551/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => routes_with_grape
(See full trace by running task with --trace)
here is my code
user.rb
module V1
class User < Grape::API
desc 'Returns pong.'
get :ping do
{ ping: params[:pong] || 'pong' }
end
end
end
app.rb
class API < Grape::API
prefix 'api'
format :json
mount ::V1::User
end
Thanks!

Answer 1

Ditch that gem and use this code (copied from here):
namespace :grape do
desc "Grape API Routes"
task :routes => :environment do
mapped_prefix = '/api' # where mounted API in routes.rb
params_str = ' params:'
desc_limit = 45
route_info = API.routes.map {|r| [r, r.instance_variable_get(:#options)] }
max_desc_size = route_info.map{|_,info| (info[:description] || '')[0..desc_limit].size }.max
max_method_size = route_info.map{|_,info| info[:method].size }.max
max_version_size = route_info.map{|_,info| info[:version].size }.max
max_path_size = route_info.map{|_,info| info[:path].sub(':version', info[:version]).size }.max
max_params_digits = route_info.map{|_,info| info[:params].size.to_s.size }.max
format_str = format(
'%%%ds %%%ds %%%ds %%%ds%%-%ds | %%%ds%%%ds %%s',
max_desc_size + 1,
max_version_size,
max_method_size,
mapped_prefix.size,
max_path_size,
max_params_digits,
params_str.size)
route_info.each do |_,info|
fields = [
info[:description] ? info[:description][0..desc_limit] : '',
info[:version],
info[:method],
mapped_prefix,
info[:path].sub(':version', info[:version]),
info[:params].size.to_s,
params_str,
info[:params].first.inspect,
]
puts format(format_str, *fields)
info[:params].drop(1).each do |param|
puts format(format_str, *([''] * (fields.size-1)) + [param.inspect])
end
end
end
end
paste it into Rakefile and modify:
route_info = API.routes.map
with your API mounting point in my case:
under app/api/web/api.rb I have
module Web
class API < Grape::API
prefix 'api'
mount Web::V1::Root
# mount API::V2::Root (next version)
end
end
So I replaced API.routes by Web::API.routes