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Kad Kerforn

2007-Dec-22 14:56 UTC

Rails 2.0 rescue_from

I am trying to use the new Rails 2.0 macro :  rescue_from


class PostsController < ApplicationController
 rescue_from ActiveRecord::RecordNotFound, :with => :deny_access
 ...
 def show
    @post = Post.find_by_id(params[:id])
    raise ActiveRecord::RecordNotFound if @post.nil?   #illegal access
.....
end

  def deny_access
    respond_to do |format|
      format.html
    end
 end


but the exception is not raised ...  did I miss something ?

thanks

kad
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Xavier Noria

2007-Dec-22 16:22 UTC

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Re: Rails 2.0 rescue_from

On Dec 22, 2007, at 3:56 PM, Kad Kerforn wrote:
> class PostsController < ApplicationController
> rescue_from ActiveRecord::RecordNotFound, :with => :deny_access
> ...
> def show
>    @post = Post.find_by_id(params[:id])
>    raise ActiveRecord::RecordNotFound if @post.nil?   #illegal access
That can be rewritten in a single line, since AR::Base.find precisely  
raises ActiveRecord::RecordNotFound if the record is not found:

   @post = Post.find(params[:id])
>  def deny_access
>    respond_to do |format|
>      format.html
>    end
> end
>
>
> but the exception is not raised ...  did I miss something ?
It should work, please debug this a little more.

-- fxn


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Kad Kerforn

2007-Dec-22 16:44 UTC

head link

Re: Rails 2.0 rescue_from

Xavier Noria wrote:> On Dec 22, 2007, at 3:56 PM, Kad Kerforn wrote:
> 
>> class PostsController < ApplicationController
>> rescue_from ActiveRecord::RecordNotFound, :with => :deny_access
>> ...
>> def show
>>    @post = Post.find_by_id(params[:id])
>>    raise ActiveRecord::RecordNotFound if @post.nil?   #illegal access
> 
> That can be rewritten in a single line, since AR::Base.find precisely
> raises ActiveRecord::RecordNotFound if the record is not found:
> 
>    @post = Post.find(params[:id])
> 
>>  def deny_access
>>    respond_to do |format|
>>      format.html
>>    end
>> end
>>
>>
>> but the exception is not raised ...  did I miss something ?
> 
> It should work, please debug this a little more.
> 
> -- fxn
thanks, it should work but it doesn''t  ...

NoMethodError (You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.post_type):
    /app/controllers/posts_controller.rb:181:in `show''

  def show
    @post = Post.find_by_id(params[:id])
    @type = @post.post_type


the @type is evaluated... despote the fact that @post = nil
 the exception should be raised but it''s not...

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Xavier Noria

2007-Dec-22 17:49 UTC

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Re: Rails 2.0 rescue_from

On Dec 22, 2007, at 5:44 PM, Kad Kerforn wrote:
> thanks, it should work but it doesn''t  ...
>
> NoMethodError (You have a nil object when you didn''t expect it!
> The error occurred while evaluating nil.post_type):
>    /app/controllers/posts_controller.rb:181:in `show''
>
>  def show
>    @post = Post.find_by_id(params[:id])
>    @type = @post.post_type
>
>
> the @type is evaluated... despote the fact that @post = nil
> the exception should be raised but it''s not...
Note that is neither your original code, nor the one I suggested.

Dynamic finders do no raise ActiveRecord::RecordNotFound, use  
AR::Base.find instead.

-- fxn


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Nathan Esquenazi

2007-Dec-22 19:07 UTC

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Re: Rails 2.0 rescue_from

@post = Post.find_by_id(params[:id])

Yeah...that doesn''t raise the ActiveRecord::RecordNotFound. The special
"by" finders just return nil. You need to use the base find as the guy
above suggested.
-- 
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Kad Kerforn

2007-Dec-22 21:40 UTC

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Re: Rails 2.0 rescue_from

Xavier Noria wrote:> On Dec 22, 2007, at 5:44 PM, Kad Kerforn wrote:
> 
>>
>> the @type is evaluated... despote the fact that @post = nil
>> the exception should be raised but it''s not...
> 
> Note that is neither your original code, nor the one I suggested.
> 
> Dynamic finders do no raise ActiveRecord::RecordNotFound, use
> AR::Base.find instead.
> 
> -- fxn
OK.. thanks
sorry, I did not use exceptions until now... so I did not notice it
I just tested in teh console :
>> Post.find(999)ActiveRecord::RecordNotFound: Couldn''t find Post with ID=999
        from 
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base.rb:1194:in
`find_one''
        from 
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base.rb:1177:in
`find_from_ids''
        from 
/usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base.rb:453:in
`find''
        from 
/Users/yves/Sites/presdemoi.net/TRY-yves-1.0/vendor/plugins/geokit/lib/geo_kit/acts_as_mappable.rb:109:in
`find''
        from (irb):1
>> Post.find_by_id(999)=> nil



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Kad Kerforn

2007-Dec-22 21:41 UTC

head link

Re: Rails 2.0 rescue_from

Nathan Esquenazi wrote:> @post = Post.find_by_id(params[:id])
> 
> Yeah...that doesn''t raise the ActiveRecord::RecordNotFound. The
special
> "by" finders just return nil. You need to use the base find as
the guy
> above suggested.
Thanks Nathan ;-))
-- 
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張衡華

2007-Dec-23 13:42 UTC

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Re: Rails 2.0 rescue_from

On Dec 23, 5:40 am, Kad Kerforn
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Xavier Noria wrote:
> > On Dec 22, 2007, at 5:44 PM, Kad Kerforn wrote:
>
> >> the @type is evaluated... despote the fact that @post = nil
> >> the exception should be raised but it''s not...
>
> > Note that is neither your original code, nor the one I suggested.
>
> > Dynamic finders do no raise ActiveRecord::RecordNotFound, use
> > AR::Base.find instead.
>
> > -- fxn
>
> OK.. thanks
> sorry, I did not use exceptions until now... so I did not notice it
> I just tested in teh console :
>
> >> Post.find(999)
>
> ActiveRecord::RecordNotFound: Couldn''t find Post with ID=999
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:1194:in
> `find_one''
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:1177:in
> `find_from_ids''
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:453:in
> `find''
>         from
> /Users/yves/Sites/presdemoi.net/TRY-yves-1.0/vendor/plugins/geokit/lib/geo_
kit/acts_as_mappable.rb:109:in
> `find''
>         from (irb):1
>
> >> Post.find_by_id(999)
>
> => nil
>
> --
> Posted viahttp://www.ruby-forum.com/.if you want find_by to raise, can overwrite your method:

def find_by_something(something)
    super || raise(ActiveRecord::RecordNotFound, ''your own error
message'')
end
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張衡華

2007-Dec-23 13:50 UTC

head link

Re: Rails 2.0 rescue_from

if you want find_by to raise, can overwrite your class method:

def self.find_by_something(something)
    super || raise(ActiveRecord::RecordNotFound, ''your own error
message'')
end


On Dec 23, 5:40 am, Kad Kerforn
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Xavier Noria wrote:
> > On Dec 22, 2007, at 5:44 PM, Kad Kerforn wrote:
>
> >> the @type is evaluated... despote the fact that @post = nil
> >> the exception should be raised but it''s not...
>
> > Note that is neither your original code, nor the one I suggested.
>
> > Dynamic finders do no raise ActiveRecord::RecordNotFound, use
> > AR::Base.find instead.
>
> > -- fxn
>
> OK.. thanks
> sorry, I did not use exceptions until now... so I did not notice it
> I just tested in teh console :
>
> >> Post.find(999)
>
> ActiveRecord::RecordNotFound: Couldn''t find Post with ID=999
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:1194:in
> `find_one''
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:1177:in
> `find_from_ids''
>         from
> /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.0.1/lib/active_record/base
.rb:453:in
> `find''
>         from
> /Users/yves/Sites/presdemoi.net/TRY-yves-1.0/vendor/plugins/geokit/lib/geo_
kit/acts_as_mappable.rb:109:in
> `find''
>         from (irb):1
>
> >> Post.find_by_id(999)
>
> => nil
>
> --
> Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~
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