Rails - Mar 2006 - Can anybody tell me step by step how validate data on form?

Hi,

I am new to ROR. I have created a form with foru fields in ROR. Now its 
working fine for all CRUD operations. But I want to validate data on 
form for "validates_presence_of" validation. How to do this?
  I tried it by putting line "validates_presence_of :description" .
But
its not working. Its throws error like  "undefined method `each''
for
nil:NilClass"
Also what is  ":description" in the "validates_presence_of
:description"
? Is it a database column name or name of the field (textbox) on my form 
that is responsible for holding value of description field?

Please help me.

Thanks in advaance.
Prash

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

hi there,

there''s a nice tutorial about validation somewhere on day 4 i think:

http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf

-david

Prashant Tiwari wrote:
> Hi,
> 
> I am new to ROR. I have created a form with foru fields in ROR. Now its 
> working fine for all CRUD operations. But I want to validate data on 
> form for "validates_presence_of" validation. How to do this?
>   I tried it by putting line "validates_presence_of :description"
. But
> its not working. Its throws error like  "undefined method
`each'' for
> nil:NilClass"
> Also what is  ":description" in the "validates_presence_of
:description"
> ? Is it a database column name or name of the field (textbox) on my form 
> that is responsible for holding value of description field?
> 
> Please help me.
> 
> Thanks in advaance.
> Prash

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

Hi,
I already tried the steps mentioned in the 
"http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf". But not 
working. I m getting above error. Please help me. I am trying from last 
2 days.
Thanx in advance.
Prash

David Ang wrote:
> hi there,
> 
> there''s a nice tutorial about validation somewhere on day 4 i
think:
> 
> http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf
> 
> -david
> 
> Prashant Tiwari wrote:
>> Hi,
>> 
>> I am new to ROR. I have created a form with foru fields in ROR. Now its
>> working fine for all CRUD operations. But I want to validate data on 
>> form for "validates_presence_of" validation. How to do this?
>>   I tried it by putting line "validates_presence_of
:description" . But
>> its not working. Its throws error like  "undefined method
`each'' for
>> nil:NilClass"
>> Also what is  ":description" in the
"validates_presence_of :description"
>> ? Is it a database column name or name of the field (textbox) on my
form
>> that is responsible for holding value of description field?
>> 
>> Please help me.
>> 
>> Thanks in advaance.
>> Prash

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

With "validates_presence_of :description", "description"
refers to a
field in your table.  It goes in the model for one of your tables; the
"description" field will be in that table.  When you go to create or
update a record in that table, the "description" field has to be
non-null.

The "undefined method ''each'' for nil::NilClass"
error is saying that
you''re trying to do an "each" iteration on an object that has
a nil
value - you can''t do an ''each'' on it because nil
objects don''t have
subcomponents.  Check for a typo in your code somewhere; if that
doesn''t help, use breakpoints to pause things at an appropriate spot
so you can check the values of your variables.

Regards

Dave M.

On 14/03/06, Prashant Tiwari <tiwari_p_k@yahoo.com>
wrote:
> Hi,
> I already tried the steps mentioned in the
> "http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf". But
not
> working. I m getting above error. Please help me. I am trying from last
> 2 days.
> Thanx in advance.
> Prash
>
> David Ang wrote:
> > hi there,
> >
> > there''s a nice tutorial about validation somewhere on day 4 i
think:
> >
> > http://www.rails4days.pwp.blueyonder.co.uk/Rails4Days.pdf
> >
> > -david
> >
> > Prashant Tiwari wrote:
> >> Hi,
> >>
> >> I am new to ROR. I have created a form with foru fields in ROR.
Now its
> >> working fine for all CRUD operations. But I want to validate data
on
> >> form for "validates_presence_of" validation. How to do
this?
> >>   I tried it by putting line "validates_presence_of
:description" . But
> >> its not working. Its throws error like  "undefined method
`each'' for
> >> nil:NilClass"
> >> Also what is  ":description" in the
"validates_presence_of :description"
> >> ? Is it a database column name or name of the field (textbox) on
my form
> >> that is responsible for holding value of description field?
> >>
> >> Please help me.
> >>
> >> Thanks in advaance.
> >> Prash
>
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>