Rails 3.2中form_tag的路由错误

Question

This question probably has been asked many time. An custom action mass_onboard_result was declared in routes.rb for engine_config :

collection do
  put :mass_onboard_result
end

In controller for engine configs, there is definition for mass_onboard_result :

def mass_onboard_result
   code here
end

Here is the view which starts with form_tag :

<%= form_tag mass_onboard_result_engine_configs_path do %>
  .......
  <%=submit_tag 'Save' %>
<% end %>

When clicking Save on the form, there is an routing error:

No route matches [POST] "/onboard_data_upload/engine_configs/mass_onboard_result"

Try running rake routes for more information on available routes.

In output of rake routes , there is:

mass_onboard_result_engine_configs PUT    /engine_configs/mass_onboard_result(.:format)

What could cause the error. Is it the declaration in routes.rb? Many thanks.

Answer 1

You have defined your route as a put route, but your form is creating a post request.

If you add method: :put into the form_tag options, is the problem resolved?

Answer 2

The error is written here:

No route matches [POST]...

A typical problem for Rails devs (especially ones starting out), is to overlook the importance of the HTTP verb in the routes structure.

--

Fix

When you use a form , it will default to sending the data via the POST verb. However, your routes have clearly defined your route as using the PUT verb:

collection do
  put :mass_onboard_result
end

To fix this, you either need to change the route to accept POST responses, or your form to send a PUT request:

#config/routes.rb
collection do
   match :mass_onboard_result, via [:post, :put]
end

-or-

#view
<%= form_tag your_path, method: :put %>