Rails - Feb 2006 - Can I protect access to a relationship?

Hi,

I have a class Match that looks like this (simplified)

class Match < ActiveRecord::Base

belongs_to :opp1, :class_name => "Player", :foreign_key =>
"opp1_id"
belongs_to :opp2, :class_name => "Player", :foreign_key =>
"opp2_id"
belongs_to :winner, :class_name => "Player", :foreign_key =>
"winner_id"

end

Can I prevent code from doing this?

@match.winner = @some_player

You can protect attributes from mass assignment, but that''s not good 
enough in this case..

Jeroen

Hi,

On 09/02/06, Jeroen Houben <jeroen@terena.nl>
wrote:
> I have a class Match that looks like this (simplified)
>
> class Match < ActiveRecord::Base
>   belongs_to :opp1, :class_name => "Player", :foreign_key
=> "opp1_id"
>   belongs_to :opp2, :class_name => "Player", :foreign_key
=> "opp2_id"
>   belongs_to :winner, :class_name => "Player", :foreign_key
=> "winner_id"
> end
>
> Can I prevent code from doing this?
>
> @match.winner = @some_player
You have several ways of preventing such behaviour:

* Write validation method for Match
(http://rails.outertrack.com/doc/modules/ActiveRecord%3A%3AValidations#validate)
* Overload winner= method and implement validation there (rather bad idea).
* Instead of saving winner id have a enum field indicating who won
(like: ''home'', ''guest'',
''draw'') and write your own accessor:

class Match < ActiveRecord::Base
  def winner
    case self.who_won
      when ''home'' then self.opp1
      when ''guest'' then self.opp2
      else nil
    end
  end
end

--
?ukasz Piestrzeniewicz

I am trying to validate a record without saving it. How can that be
accomplished?

Thanks,

Willi

use valid?

http://api.rubyonrails.com/classes/ActiveRecord/Validations.html

On Feb 9, 2006, at 4:39 PM, Willi Weichselbaumer wrote:
> I am trying to validate a record without saving it. How can that be
> accomplished?
>
> Thanks,
>
> Willi
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Valid? Gives me true or false, but I need the errors associated to each
column.

 	

-----Original Message-----
From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Eddie Hillenbrand
Sent: Thursday, February 09, 2006 4:02 PM
To: rails@lists.rubyonrails.org
Subject: Re: [Rails] How can I force the validation of a record without
savingit?

use valid?

http://api.rubyonrails.com/classes/ActiveRecord/Validations.html

On Feb 9, 2006, at 4:39 PM, Willi Weichselbaumer wrote:
> I am trying to validate a record without saving it. How can that be
> accomplished?
>
> Thanks,
>
> Willi
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
_______________________________________________
Rails mailing list
Rails@lists.rubyonrails.org
http://lists.rubyonrails.org/mailman/listinfo/rails

Once you''ve done object.valid? you can do object.errors to get the
validation errors, can''t you?

On 2/9/06, Willi Weichselbaumer <willi.weichselbaumer@mcomi.com>
wrote:
>
> Valid? Gives me true or false, but I need the errors associated to each
> column.
>
>
>
> -----Original Message-----
> From: rails-bounces@lists.rubyonrails.org
> [mailto:rails-bounces@lists.rubyonrails.org] On Behalf Of Eddie
> Hillenbrand
> Sent: Thursday, February 09, 2006 4:02 PM
> To: rails@lists.rubyonrails.org
> Subject: Re: [Rails] How can I force the validation of a record without
> savingit?
>
> use valid?
>
> http://api.rubyonrails.com/classes/ActiveRecord/Validations.html
>
> On Feb 9, 2006, at 4:39 PM, Willi Weichselbaumer wrote:
>
> > I am trying to validate a record without saving it. How can that be
> > accomplished?
> >
> > Thanks,
> >
> > Willi
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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Thanks,

 

That actually works, I somehow missed that.

 

Willi


Subject: Re: [Rails] How can I force the validation of a record
withoutsavingit?

 

Once you''ve done object.valid? you can do object.errors to get the
validation errors, can''t you?

On 2/9/06, Willi Weichselbaumer < willi.weichselbaumer@mcomi.com
<mailto:willi.weichselbaumer@mcomi.com> > wrote:

Valid? Gives me true or false, but I need the errors associated to each 
column.



-----Original Message-----
From: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org ] On Behalf Of Eddie Hillenbrand
Sent: Thursday, February 09, 2006 4:02 PM
To: rails@lists.rubyonrails.org
Subject: Re: [Rails] How can I force the validation of a record without 
savingit?

use valid?

http://api.rubyonrails.com/classes/ActiveRecord/Validations.html

On Feb 9, 2006, at 4:39 PM, Willi Weichselbaumer wrote: 
> I am trying to validate a record without saving it. How can that be
> accomplished?
>
> Thanks,
>
> Willi
>
> _______________________________________________
> Rails mailing list 
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
_______________________________________________ 
Rails mailing list
Rails@lists.rubyonrails.org
http://lists.rubyonrails.org/mailman/listinfo/rails 

_______________________________________________
Rails mailing list
Rails@lists.rubyonrails.org
http://lists.rubyonrails.org/mailman/listinfo/rails

 

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