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Feng Tien

2008-Mar-06 20:53 UTC

Validate 2 models in 1 form?

I have 2 models, an artist and song model

I have the validates_presence_of on each of the models (for checking
title, artist name, and etc). They validate fine when you add items on
their own controller (1 form for each model),

but my program doesn''t validate when I combine both models in 1 form.
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Visit Indonesia 2008

2008-Mar-06 21:42 UTC

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Re: Validate 2 models in 1 form?

1. Maybe There''s no attribute in one of your model, you can use 
attr_accessor.
2. Have you tried like this ?

------------
Controller :
------------
def new_song
#it uses Song Model
@bad_song = Artist.new

#it uses Artis Model
@bad_artist = Artist.new
end

def record_it
@bad_song = Song.new(params[:song])
@bad_artist = Artist.new(params[:artist])

if @bad_song.save
else
 flash[:notice] = "Error.."
end


if @bad_artist.save
else
 flash[:notice] = "Error.."
end


end


------------
View :
------------

<%#= comment your error_messages_for ''song'' %>
<%#= comment your error_messages_for ''artist'' %>
<%#= they will show you double tables error message %>

<% form_tag :action => ''record_it'' do %>
<%= text_field ''song'', ''title''  %>
<%= text_field ''artist'', ''artist_name'' 
%>
<%= submit_tag "save" %>
<% end %>


Have Nice Try and Good Luck. Would You mind to provide us your code so 
we can see your trouble location.


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Mike Garey

2008-Mar-06 21:47 UTC

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Re: Validate 2 models in 1 form?

are artists and songs related? (I assume they are). If so, how?  How
are you creating each model in your one form?  You may want something
similar to the following:

class Artist < AR::Base
  has_many :songs
  validates_presence_of :name
end

class Song < AR::Base
  belongs_to :artist
  validates_presence_of :title
end

class SomeController < ActionController
  def new
    @artist = Artist.new
    @song = @artist.songs.build
  end

  def create
    @artist = Artist.new(params[:artist])

    # append a new song to the list of songs for the artist
    # you may want to loop through a collection of songs passed from the form
    # if you want to provide the ability to add multiple songs at
once, or you could build
    # this into the model
    @song = @artist.songs.build(params[:songs])

   if @artist.save
     # both the artist and its related song objects are valid
   else
     # either artist was invalid or the song object was
   end
  end
end

and in your view:

views/artists/new.html.erb

<%= error_messages_for :artist, :song %>


Of course the above gets more complicated if you want to assign
multiple songs at a time, but this should at least get you started.

Mike



On Thu, Mar 6, 2008 at 3:53 PM, Feng Tien
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>  I have 2 models, an artist and song model
>
>  I have the validates_presence_of on each of the models (for checking
>  title, artist name, and etc). They validate fine when you add items on
>  their own controller (1 form for each model),
>
>  but my program doesn''t validate when I combine both models in 1
form.
>  --
>  Posted via http://www.ruby-forum.com/.
>
>  >
>
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Visit Indonesia 2008

2008-Mar-06 21:56 UTC

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Re: Validate 2 models in 1 form?

Yow... Mike, YOurs is more reasonable than me.
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Stephan Wehner

2008-Mar-06 23:17 UTC

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Re: Validate 2 models in 1 form?

Feng Tien wrote:> I have 2 models, an artist and song model
> 
> I have the validates_presence_of on each of the models (for checking
> title, artist name, and etc). They validate fine when you add items on
> their own controller (1 form for each model),
> 
> but my program doesn''t validate when I combine both models in 1
form.
Use

validates_associated :song # in artist model

validates_associated :artist # in song model

http://ar.rubyonrails.com/classes/ActiveRecord/Validations/ClassMethods.html#M000304



Stephan

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stephen.celis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2008-Mar-07 00:06 UTC

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Re: Validate 2 models in 1 form?

Stephan,

Please note in the API:
> class Book < ActiveRecord::Base
>   has_many :pages
>   validates_associated :pages
>
> Warning: If, after the above definition, you then wrote:
>
> class Page < ActiveRecord::Base
>   belongs_to :book
>   validates_associated :book
>
> ...this would specify a circular dependency and cause infinite recursion.
On Mar 6, 5:17 pm, Stephan Wehner
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Feng Tien wrote:
> > I have 2 models, an artist and song model
>
> > I have the validates_presence_of on each of the models (for checking
> > title, artist name, and etc). They validate fine when you add items on
> > their own controller (1 form for each model),
>
> > but my program doesn''t validate when I combine both models in
1 form.
>
> Use
>
> validates_associated :song # in artist model
>
> validates_associated :artist # in song model
>
> http://ar.rubyonrails.com/classes/ActiveRecord/Validations/ClassMetho...
>
> Stephan
>
> --
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Stephan Wehner

2008-Mar-07 00:20 UTC

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Re: Validate 2 models in 1 form?

stephen.celis-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:> Stephan,
> 
> Please note in the API:
> 
>> ...this would specify a circular dependency and cause infinite
recursion.
> On Mar 6, 5:17 pm, Stephan Wehner
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
I see, then can add a field like this

class Artist < ActiveRecord::Base

  :attr_accessor skip_validate_song
  validates_associated :song, :if => Proc.new { |record| 
!record.skip_validate_song }

end

(and / or equivalent to Song class)

Plus set that in the controller as the case may be.

Stephan
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Rails - Mar 2008 - Validate 2 models in 1 form?

Validate 2 models in 1 form?

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