Rails - Nov 2010 - Devise: binding 'resource' (aka general error reporting)

The much maligned but otherwise innocent "devise_error_messages!"
method
in the DeviseHelper module starts out with:

def devise_error_messages!
    return "" if resource.errors.empty?
    ...
end

My question: where is ''resource'' set up?  I''d like to
replicate its
functionality, but my naive approach (creating a FooHelper module in
app/helpers) fails because ''resource'' isn''t bound.

Another way to ask the question: rather than creating specific error
handlers for User, Topic, Profile, etc, I''d like to write a single
error
handling helper that can be used for any model.

Right now each of my _form.html.erb files start with something like:

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

... but it''s clearly unDRY to replicate that for @user, @topic,
@profile.  How can I write a helper that will generalize to the current
resource?

- ff

P.S.: Anyone looking to eliminate the "DEPRECATION WARNING:
f.error_messages was removed from Rails" warning might be interested in
the answer to this thread.  Now it will turn up in a search...

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I figured out the answer to my own question, and I''m embarrassed by how
trivial it is: create a helper function that takes @user, @topic,
@profile etc as an argument.  For example:

# app/helpers/my_helper.rb
module MyHelper
  def my_error_message(obj)
    return unless obj.errors.any?
    summary = "#{pluralize(obj.errors.count, "error")} prevented
this
#{obj.class} from being saved:"
    msgs = obj.errors.full_messages.map { |msg| content_tag(:li, msg)
}.join
    "<div
id=\"error_explanation\"><h3>#{summary}</h3><ul>#{msgs}</ul></div>".html_safe
  end
end

Now you can sprinkle <%= my_error_message(@user) %> in the top of
user/_form.html.erb, etc.  Works like a champ.

- ff

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Much obliged for this answer!



On Nov 12, 3:48 pm, Fearless Fool
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> I figured out the answer to my own question, and I''m embarrassed
by how
> trivial it is: create a helper function that takes @user, @topic,
> @profile etc as an argument.  For example:
>
> # app/helpers/my_helper.rb
> module MyHelper
>   def my_error_message(obj)
>     return unless obj.errors.any?
>     summary = "#{pluralize(obj.errors.count, "error")}
prevented this
> #{obj.class} from being saved:"
>     msgs = obj.errors.full_messages.map { |msg| content_tag(:li, msg)}.join
>
>     "<div
>
id=\"error_explanation\"><h3>#{summary}</h3><ul>#{msgs}</ul></div>".html_sa
fe
>   end
> end
>
> Now you can sprinkle <%= my_error_message(@user) %> in the top of
> user/_form.html.erb, etc.  Works like a champ.
>
> - ff
>
> --
> Posted viahttp://www.ruby-forum.com/.
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