Question

Here’s what I have in my users/edit.html/erb

<%= form_for(resource, :as => resource_name, :url => user_path(resource_name), :html => { :method => :put }) do |f| %>

My routes for user:

           edit_user GET    /users/:id/edit(.:format)      users#edit
                user GET    /users/:id(.:format)           users#show
                     PUT    /users/:id(.:format)           users#update

method => put, so using the routes info, I am expecting the HTML action to be /users/:id

This being users/edit.html.erb, I am expecting the HTML for from id to be edit_user_id, and class to be edit_user

Here’s what I’m actually getting in HTML (using firebug) when the form is displayed:

<form id="new_user" class="new_user" method="post" action="/users/user" accept-charset="UTF-8">

Shouldn’t the HTML have been (assuming a user id of 1):

<form id="edit_user_1" class="edit_user" method="post" action="/users/1" accept-charset="UTF-8">

In my routes.rb file, I have:

resources :users, only: [:show, :edit, :update]
devise_for :users, :controllers => { :registrations => 'registrations', :confirmations => 'confirmations' }, :path => '', :path_names => { :sign_in => "login", :sign_up => "request_invite" }

Edit – response to Viktor’s comment:

I did change the User help to:

def resource
  @resource ||= User.find(params[:id])
end

So, per the API docs, this should also have picked up /users/:id as an action, so, the HTML should now look like this:

<form id="edit_user_1" class="edit_user" method="post" action="/users/1" accept-charset="UTF-8">

Instead, it is:

<form id="edit_user" class="edit_user" method="post" action="/users/user" accept-charset="UTF-8">

So, when the User controller steps into action, the following code is hit:

def update
  @user = User.find(params[:id])

and it thinks that (fron the form’s action), that the id I’m passing is the word user, so I’m expecting to get the following error message when I click on update:

Couldn’t find User with id=user

and that’s exactly what I’m getting as an error. Any additional insight?

Final Answer:

In users_helper.rb:

def resource
  @resource ||= User.find(params[:id])
end

and in users/edit.html.erb

resource_name, :html => { :method => :put }) do |f| %>

Answer 1

short answer is: it depends on the value of resource in your view.

http://apidock.com/rails/v3.2.3/ActionView/Helpers/FormHelper/apply_form_for_options!
the ids and classes for form are generated by the dom_id and dom_class helpers, the ‘action’ prefix being ‘edit’ and not ‘new’ if and only if:

object.respond_to?(:persisted?) && object.persisted?

for an activerecord object, this evaluates to true if and only if the object has ever been saved to db.