Rails - Nov 2009 - Wrong number of arguments (0 for 1) in callback method

I was creating this simple rail application. my controller method looks
like this:
-------
def create()
    @simple = Simple.new(params[:simple]) ##params coming from view
    @simple.save
end
-------

And my model class "Simple" as below:

-------
class Simple < ActiveRecord::Base
  set_table_name "name_desc_table"
  set_primary_key "name"

  before_create :init_name

  private
  def init_name(cname)
    self.name = cname
  end
end
-------

When I run this in browser, it throws error "Wrong number of arguments
(0 for 1)". Obviously, my method "init_name" expects one
parameter and
it doesn''t find any while called(by controller??). Basically I want to
send this ''cname'' variable from controller to model. Can
anybody tell me
what can I do in controller method so that ''cname'' variable is
passed
when callback method is called?

Thanks,
-Kalpesh
-- 
Posted via http://www.ruby-forum.com/.

On Nov 13, 9:00 am, Kalpesh1 Patel
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> When I run this in browser, it throws error "Wrong number of arguments
> (0 for 1)". Obviously, my method "init_name" expects one
parameter and
> it doesn''t find any while called(by controller??). Basically I
want to
> send this ''cname'' variable from controller to model. Can
anybody tell me
> what can I do in controller method so that ''cname''
variable is passed
> when callback method is called?
Callbacks like before_create can''t take any arguments

Fred
>
> Thanks,
> -Kalpesh
> --
> Posted viahttp://www.ruby-forum.com/.

Frederick Cheung wrote:
> On Nov 13, 9:00�am, Kalpesh1 Patel <rails-mailing-l...@andreas-s.net>
> wrote:
> 
>> When I run this in browser, it throws error "Wrong number of
arguments
>> (0 for 1)". Obviously, my method "init_name" expects one
parameter and
>> it doesn''t find any while called(by controller??). Basically I
want to
>> send this ''cname'' variable from controller to model.
Can anybody tell me
>> what can I do in controller method so that ''cname''
variable is passed
>> when callback method is called?
> 
> Callbacks like before_create can''t take any arguments
> 
> Fred
So isn''t there any way I can pass some value from controller to model?
-- 
Posted via http://www.ruby-forum.com/.

Hi Kalpesh1 Patel
> So isn''t there any way I can pass some value from controller to
model?
    You can define cname as n attr_writer in model and can set its value 
from controller like @simple.cname = ''namehere''


Sijo

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

On Fri, Nov 13, 2009 at 10:39 AM, Kalpesh1 Patel
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
> Frederick Cheung wrote:
>> On Nov 13, 9:00�am, Kalpesh1 Patel
<rails-mailing-l...@andreas-s.net>
>> wrote:
>>
>>> When I run this in browser, it throws error "Wrong number of
arguments
>>> (0 for 1)". Obviously, my method "init_name" expects
one parameter and
>>> it doesn''t find any while called(by controller??).
Basically I want to
>>> send this ''cname'' variable from controller to
model. Can anybody tell me
>>> what can I do in controller method so that
''cname'' variable is passed
>>> when callback method is called?
>>
>> Callbacks like before_create can''t take any arguments
>>
>> Fred
>
> So isn''t there any way I can pass some value from controller to
model?
What do you mean? Of course you can pass values, in fact, you''re
passing a value there.
I don''t see the need of doing something like the before_create hook.
Why don''t you just pass the value to the constructor? Simple.new(:name
=> params[:simple])


-- 
Leonardo Mateo.
There''s no place like ~

Sijo k g wrote:
> Hi Kalpesh1 Patel
> 
>> So isn''t there any way I can pass some value from controller
to model?
> 
>     You can define cname as n attr_writer in model and can set its value 
> from controller like @simple.cname = ''namehere''
> 
> 
> Sijo
Thanks sijo! I am able to get/set it using attr_accessor now :)
-- 
Posted via http://www.ruby-forum.com/.

Leonardo Mateo wrote:
> On Fri, Nov 13, 2009 at 10:39 AM, Kalpesh1 Patel
> <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>>>> when callback method is called?
>>>
>>> Callbacks like before_create can''t take any arguments
>>>
>>> Fred
>>
>> So isn''t there any way I can pass some value from controller
to model?
> What do you mean? Of course you can pass values, in fact, you''re
> passing a value there.
> I don''t see the need of doing something like the before_create
hook.
> Why don''t you just pass the value to the constructor?
Simple.new(:name
> => params[:simple])
> 
> 
> --
> Leonardo Mateo.
> There''s no place like ~
I need before_create because I want to do some preprocessing everytime i 
save my ''Simple'' state in the DB. For example, authentication,
logging
or similar stuff I will perform just before ''save''(this might
raise
another question, is this right approach? but this can be a separate 
discussion). I thought of passing the value in the callback method 
itself but now I am able to do it through attr_accessor. Thanks Leo for 
the suggestion :)

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

Somewhat unrelated, but if you''re creating a new, "simple"
Rails app,
why are you tangling with set_table_name and a noninteger primary key?
Working against the Rails conventions will cause no end of trouble,
especially if you''re just starting out...

--Matt Jones

On Nov 13, 4:00 am, Kalpesh1 Patel
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> I was creating this simple rail application. my controller method looks
> like this:
> -------
> def create()
>     @simple = Simple.new(params[:simple]) ##params coming from view
>     @simple.save
> end
> -------
>
> And my model class "Simple" as below:
>
> -------
> class Simple < ActiveRecord::Base
>   set_table_name "name_desc_table"
>   set_primary_key "name"
>
>   before_create :init_name
>
>   private
>   def init_name(cname)
>     self.name = cname
>   end
> end
> -------
>
> When I run this in browser, it throws error "Wrong number of arguments
> (0 for 1)". Obviously, my method "init_name" expects one
parameter and
> it doesn''t find any while called(by controller??). Basically I
want to
> send this ''cname'' variable from controller to model. Can
anybody tell me
> what can I do in controller method so that ''cname''
variable is passed
> when callback method is called?
>
> Thanks,
> -Kalpesh
> --
> Posted viahttp://www.ruby-forum.com/.

Hi Matt,
Actually I am trying to connect to already existing DB where mentioned
table is readily available. I just need to read it all the time or
occasionally write it but I do not create it from my app. The primary
key of the table is varchar. I can do nothing about that and if i do
not declare it into my model, it will assume a primary key
''id'' in the
table. Is there any better way here?

PS: i cannot see your posting on ruby-forum. Will it take LOTS of time
for that to appear on the site or something else?

-Kalpesh

On Sat, Nov 14, 2009 at 10:54 PM, Matt Jones
<al2o3cr-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Somewhat unrelated, but if you''re creating a new,
"simple" Rails app,
> why are you tangling with set_table_name and a noninteger primary key?
> Working against the Rails conventions will cause no end of trouble,
> especially if you''re just starting out...
>
> --Matt Jones
>
> On Nov 13, 4:00 am, Kalpesh1 Patel
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> I was creating this simple rail application. my controller method looks
>> like this:
>> -------
>> def create()
>>     @simple = Simple.new(params[:simple]) ##params coming from view
>>     @simple.save
>> end
>> -------
>>
>> And my model class "Simple" as below:
>>
>> -------
>> class Simple < ActiveRecord::Base
>>   set_table_name "name_desc_table"
>>   set_primary_key "name"
>>
>>   before_create :init_name
>>
>>   private
>>   def init_name(cname)
>>     self.name = cname
>>   end
>> end
>> -------
>>
>> When I run this in browser, it throws error "Wrong number of
arguments
>> (0 for 1)". Obviously, my method "init_name" expects one
parameter and
>> it doesn''t find any while called(by controller??). Basically I
want to
>> send this ''cname'' variable from controller to model.
Can anybody tell me
>> what can I do in controller method so that ''cname''
variable is passed
>> when callback method is called?
>>
>> Thanks,
>> -Kalpesh
>> --
>> Posted viahttp://www.ruby-forum.com/.
> >
>


-- 
Why so serious?