Rails - Dec 2005 - Instance variables don''t persist between actions?

Following a simple example of the Rails book and using scaffolding I got a 
simple application to manage a user database.

the controller is like:

  def new
    @user = User.new
    @text = "Hello World"
  end

  def create
    @user = User.new(params[:user])
    if @user.save
      flash[:notice] = ''User was successfully created.''
      redirect_to :action => ''list''
    else
      render :action => ''new''
    end
  end

Note the @text var I create on the new action.. The view is the scaffold 
generated one with a little addition at the end to print the @text instance 
var I create in the "new" action.

very simple stuff and it works. 

If I add validation to the model like "validates_presence_of   :name"
and
press the create button without filling the name field in the form the
''new''
action is rendered with the error box at the top indicating error (this is 
ok)  but the @text var dissappears.  Making some tests I find that @text is 
nil when this page is rendered and there are error_messages_for user. 

If I want the @text var to be displayed in the form when creating a new user 
and when there are errors, I have to create that var in both actions
"new"
and "create" . I think this is a violation of the DRY principle.

Am I doing something wrong??


regards,
Horacio

When you hit the create button on your form, the create action is  
called, not the new action.  When you get an error on your save, the  
new form is rendered, but the new action isn''t called so the @test  
won''t be set.

You can do "new" before you do your render of new as one workaround.

Chris Nolan.ca
http://kekova.ca/

On Dec 28, 2005, at 11:37, Horacio Sanson wrote:
>
> Following a simple example of the Rails book and using scaffolding  
> I got a
> simple application to manage a user database.
>
> the controller is like:
>
>   def new
>     @user = User.new
>     @text = "Hello World"
>   end
>
>   def create
>     @user = User.new(params[:user])
>     if @user.save
>       flash[:notice] = ''User was successfully created.''
>       redirect_to :action => ''list''
>     else
>       render :action => ''new''
>     end
>   end
>
> Note the @text var I create on the new action.. The view is the  
> scaffold
> generated one with a little addition at the end to print the @text  
> instance
> var I create in the "new" action.
>
> very simple stuff and it works.
>
> If I add validation to the model like  
> "validates_presence_of   :name" and
> press the create button without filling the name field in the form  
> the ''new''
> action is rendered with the error box at the top indicating error  
> (this is
> ok)  but the @text var dissappears.  Making some tests I find that  
> @text is
> nil when this page is rendered and there are error_messages_for user.
>
> If I want the @text var to be displayed in the form when creating a  
> new user
> and when there are errors, I have to create that var in both  
> actions "new"
> and "create" . I think this is a violation of the DRY principle.
>
> Am I doing something wrong??
>
>
> regards,
> Horacio
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