Rails - Jan 2006 - Getting the current Action in the Model

Is it possible to get the current Controller''s action from within the 
Model?  I have a situation where I want a piece of validation to run on 
edits, but not on new creates.

Thanks,

- Mark

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

On Jan 7, 2006, at 9:49 PM, Mark Haliday wrote:
> Is it possible to get the current Controller''s action from within
the
> Model?  I have a situation where I want a piece of validation to  
> run on
> edits, but not on new creates.
>
> Thanks,
>
> - Mark
>
You could hack things up to work that way, but there may be a better  
way: use conditional validations.

For example:

class Donut < ActiveRecord::Base
   attr_accessor :glazed

   def glazed?
     @glazed
   end

   validates_numericality_of :holes, :if => :glazed?
end


Then in your controller:

def update
   @donut.glazed = false
   if @donut.save
     ...
   end
end

def create
   @donut.glazed = true
   if @donut.save
     ...
   end
end

This approach keeps the control on the Controller side, rather than  
requiring your Model to know about controller names and actions.

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

On Sun, Jan 08, 2006 at 05:49:54AM +0100, Mark Haliday
wrote:
> Is it possible to get the current Controller''s action from within
the
> Model?  I have a situation where I want a piece of validation to run on 
> edits, but not on new creates.
This functionality is build into the validation framework. By default
validations are run always, but you can pass the :on option with either
:update or :create as its value.

validate_acceptance_of :terms_of_service, :on => :create

Aside from validations, active record objects also have a new_record? method.

t = Thing.new
t.new_record? # => true
t.save
t.new_record? # => false
Thing.find(t.id).new_record? # => false

marcel
-- 
Marcel Molina Jr. <marcel@vernix.org>

On 1/7/06, Duane Johnson <duane.johnson@gmail.com>
wrote:
>
> On Jan 7, 2006, at 9:49 PM, Mark Haliday wrote:
>
> > Is it possible to get the current Controller''s action from
within the
> > Model?  I have a situation where I want a piece of validation to
> > run on
> > edits, but not on new creates.
> >
> > Thanks,
> >
> > - Mark
> >
> You could hack things up to work that way, but there may be a better
> way: use conditional validations.
>
> For example:
>
> class Donut < ActiveRecord::Base
>    attr_accessor :glazed
>
>    def glazed?
>      @glazed
>    end
>
>    validates_numericality_of :holes, :if => :glazed?
> end
>
>
> Then in your controller:
>
> def update
>    @donut.glazed = false
>    if @donut.save
>      ...
>    end
> end
>
> def create
>    @donut.glazed = true
>    if @donut.save
>      ...
>    end
> end
Goddamn it, now you made me hungry.  :-(