Question

When adding :remote => true to my edit form in my rails app, submits work fine, but now my program does not show error messages. I have tried multiple solutions but none of them have worked. Can anyone point me in the correct direction to solve this problem? If the entry is successfully saved, a notice message is added to a div, something I wrote in edit.js.erb. I tried to also have the ‘error messages’ added to an error message div but @entry.errors.any? never returns true when I add :remote => true.

This is the edit div in my form I am trying to update.

<div id="errors">
  <% if @entry.errors.any? %>
      <h2><%= pluralize(@entry.errors.count, "error") %> prohibited this entry from being saved:</h2>

      <ul>
      <% @entry.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
  <% end %>
</div>

I also have its contents in a partial and my edit.js.erb tries to update the div with the newly rendered partial, but now @entry.errors.any? is not returning true here anymore.. Here is also my controller…

# GET /entries/1/edit
def edit
  @entry = Entry.find(params[:id])

  respond_to do |format|
    format.html
    format.js
  end
end


def update
  @entry = Entry.find(params[:id])

  respond_to do |format|
    if @entry.update_attributes(params[:entry])
      format.html { redirect_to edit_entry_path(@entry), notice: 'Entry was successfully updated.' }
      format.json { head :no_content }
    else
      format.html { render action: "edit" }
      format.json { render json: @entry.errors, status: :unprocessable_entity }
    end
  end
end

Answer 1

I created a partial, _errors.html.erb

<% if @entry.errors.any? %>
    <h2><%= pluralize(@entry.errors.count, "error") %> prohibited this entry from being saved:</h2>
    <ul>
    <% @entry.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
<% end %>

I created update.js.erb

$("#errorlist").html("<%= escape_javascript(render('errors')) %>");

where #errors refers to a in my form, and the errors partial. Finally my controller is like this now.
# PUT /entries/1
# PUT /entries/1.json
def update
@entry = Entry.find(params[:id])

def update
  @entry = Entry.find(params[:id])

  respond_to do |format|
    if @entry.update_attributes(params[:entry])
      format.html { redirect_to edit_entry_path(@entry), notice: 'Entry was successfully updated.' }
      format.json { head :no_content }
    else
      format.html
      format.js
    end
  end
end

Also, since I only want ajax on my edit form, and not my create form (adding :remote => true to _form.html.erb effects both) I also changed this line in _form.html.erb from

<%= form_for @entry, :remote => true, :html => {:id => "editform", :multipart => true} do |f| %>

to

<%= form_for @entry, :remote => current_page?(:controller => 'entries', :action => 'new') ? false : true, :html => {:id => "editform", :multipart => true} do |f| %>

Thank you for the help, those who helped me achieve my solution.