Rails：method =>：补丁不​​起作用

Question

So, I have this form declaration:

<%= form_for 'students_list', {:url => update_students_list_stream_url(@stream), :method=>:patch}  do |students_list_form| %>

Just as described in API docs, but this leads me to error:

No route matches [POST] "/streams/26/edit-students-list"

So it still tries to post, even though my HTML input has:

<input type="hidden" name="_method" value="patch" />

From Rails guide:

Rails works around this issue by emulating other methods over POST with a hidden input named "_method", which is set to reflect the desired method:

I'm quite confused

Answer 1

You'll be better doing this:

<%= form_for @stream do |student_form_list| %>

---

If you've set up your routes using the standard resources directive , you'll have the following routes:

Of these routes, the update path should just be students_list_stream_path -- not the update_students_list_stream_path you have now.

If you've set up the form_for to use the correct object, it will automatically set the path & method for update .

Answer 2

I was looking for an answer on why rails loaded method patch as post in the rendered form. If you ended up here looking for that like I did, this is the answer you are looking for:

https://stackoverflow.com/a/46699512/5750078

From https://guides.rubyonrails.org/form_helpers.html#how-do-forms-with-patch-put-or-delete-methods-work-questionmark :

Answer 3

Rails use Rack::MethodOverride middleware that tweaks the HTTP methods PUT/PATCH to POST for supporting old browsers.

This can happen on Rails API application to unload the middleware for performance. In some cases where you want to call a casual PUT/PATCH request using form_with tag in the views, simply add

# config/application.rb

config.middleware.insert_after Rack::Runtime, Rack::MethodOverride