Rails - Mar 2006 - Validation - How to pop up error messages

Hi,

I''m trying to "validate" the input provided in the login form
to see if
"username" is entered or not? How do i do this ?

In the model i have done like this

validates_presence_of username, :body, :message => "Missing required 
field"

But I''m not this message (Missing required field ) getting printed at 
all? How do i print this?

Do i need to add some thing in the "view" also ???
Meaning if the "username" field is blank, then i want to pop up this 
message. But i do not see this message getting poped up when i leave the 
username field blank.

Can somebody please help out?

Thank You



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Dinesh Umanath wrote:
> Hi,
> 
> I''m trying to "validate" the input provided in the login
form to see if
> "username" is entered or not? How do i do this ?
> 
> In the model i have done like this
> 
> validates_presence_of username, :body, :message => "Missing
required
> field"
It should probably be validates_presence_of :username (note the colon)

Assuming the model is called user, in the view I think you''ll need

<%= error_messages_for ''user'' %>

somewhere on the page

A.

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Alan Francis wrote:
> Dinesh Umanath wrote:
>> Hi,
>> 
>> I''m trying to "validate" the input provided in the
login form to see if
>> "username" is entered or not? How do i do this ?
>> 
>> In the model i have done like this
>> 
>> validates_presence_of username, :body, :message => "Missing
required
>> field"
> 
> It should probably be validates_presence_of :username (note the colon)
> 
> Assuming the model is called user, in the view I think you''ll need
> 
> <%= error_messages_for ''user'' %>
> 
> somewhere on the page
> 
> A.
Hi Franchis,

Thanks for your immediate reply. Yes that worked, i''m able to see the 
error message. In the final view i''m populating some values using a 
relationship, but some how that does not work if i keep the above code 
<%= error_messages_for ''user'' %>. The moment i remove
the "population -
<selection> tag" in the view, then the validation works. I will have
to
look into it, probably some problem with my code

And finally i think we should be able to change the color,font etc of 
the error message displayed on the view??

Again thanks for your reply

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Dinesh Umanath wrote:
> And finally i think we should be able to change the color,font etc of 
> the error message displayed on the view??
Hi Dinesh, can''t speak to the former problem without some concrete code
to look at, but on this second one the error_messages_for produces some 
xhtml which is styled from the scaffold.css (I think) it should be 
possible to style the box differently by looking at the XHTML source in 
the browser and noting down what classes and ids are mentioned.  The div 
by default is errorExplanation and the class on each mesage is again 
errorExplanation.  You can add options of the id and class to change 
them if you like.

If you need more control, you can write your own helper and go to the 
object.errors yourself.

See here: 
http://api.rubyonrails.com/classes/ActionView/Helpers/ActiveRecordHelper.html

(pop open the source to see how easy it is to do your own)

Alan

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