Tom Lieber on 6 Feb 2006 17:49:13 -0000

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Re: [PhillyOnRails] Simple Form Validation Example

On 2/5/06, Jason Lenhart <> wrote:
> I have a form being populated and have used the
> following:
> <%= text_field("user", "name", "class" => "field") %>
> Note that my user model class is not going to a
> database via scaffold - just a class in my models
> directory.
> When the form is submitted I cannot find a way to get
> a handle on the populated user model object.  I dug
> through my Rails book to no avail - did not see any
> straightforward ways of doing this.

Typically, in your controller, for the action to which the form is
submitted, you will have a line like this:

    @user =[:user])

When you write text_field("user", "name"), what you're saying is
"display a field for the parameter 'name' of the object @user". Thus,
by creating the object this way, the object @user will have the data
from the last form submission at all times. This is how, when you use
a scaffold, forms retain all of your entered values when there is an
error and the form is redisplayed. When there is no @user created in
this way, the form will be cleared after every request.

> Also - should I be declaring the instance varialbles
> in my user object any special way?

Instance variables in models can be used normally, and without being
too careful, you can avoid conflicting with any of the ActiveRecord

> Thanks for any help that can be offered,
> Jason


Tom Lieber
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