Rails - Jan 2006 - Problems with error_messages_for

I have a model Area which has_many Streets.  The Area has a couple of 
attributes of its own but mostly I want to be able to add/delete/update 
Streets for a particular Area, but all on one page rather than having a 
separate view for editing a Street.  I''ve managed to get a form 
displayed with a row for each Street already assigned to the Area by 
using form fields with street[id][name], street[id][num_houses] etc. 
But when I send the form I don''t know how to get any validation errors 
reported.  Errors on Area are nicely displayed with the red outlines - I 
think this is thanks to <%= error_messages_for ''area'' %>
being included
in the view.  Can I get this to work for the multiple Street input 
fields as well?
I''ve tried <%= error_messages_for ''street'' %>
(You have a nil object
when you didn''t expect it! You might have expected an instance of 
ActiveRecord::Base. The error occured while evaluating nil.errors)
and <%= error_messages_for ''street[]'' %> 
(`@street[]'' is not allowed as
an instance variable name)

  def update_area
    @area = Area.find(params[:id])
    @streets = @area.streets

    unless params[:street].nil?
      Street.update(params[:street].keys, params[:street].values)
    end

    if @area.update_attributes(params[:area])
      flash[:notice] = ''Area was successfully updated.''
      redirect_to :action => ''edit_area'', :id => @area
    else
      render :action => ''edit_area''
    end
  end


Thanks so much in advance for any suggestions.

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Posted via http://www.ruby-forum.com/.

On Jan 23, 2006, at 6:39 AM, Michael Bannister wrote:
> I have a model Area which has_many Streets.  The Area has a couple of
> attributes of its own but mostly I want to be able to add/delete/ 
> update
> Streets for a particular Area, but all on one page rather than  
> having a
> separate view for editing a Street.  I''ve managed to get a form
> displayed with a row for each Street already assigned to the Area by
> using form fields with street[id][name], street[id][num_houses] etc.
> But when I send the form I don''t know how to get any validation
errors
> reported.  Errors on Area are nicely displayed with the red  
> outlines - I
> think this is thanks to <%= error_messages_for ''area''
%> being
> included
> in the view.  Can I get this to work for the multiple Street input
> fields as well?
error_ messages_for is not responsible for adding the red outlines-- 
its sole purpose is to dump out the error messages associated with an  
ActiveRecord object.  In fact, it is highly recommended that you use  
your own method or replace error_messages_for because it is so ugly  
(imho).

To answer your question, though, see http://www.ruby-forum.com/topic/ 
52143.  The topic is closely related, and then goes off-topic a bit  
towards your direction, so keep reading.


Duane Johnson
(canadaduane)
http://blog.inquirylabs.com/


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> To answer your question, though, see http://www.ruby-forum.com/topic/
> 52143.  The topic is closely related, and then goes off-topic a bit
> towards your direction, so keep reading.
Many thanks - looks like what I''m after, and I''ll read it more
thoroughly tomorrow! :-)

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