From: David Madden <moose56@...>
Date: 2007-02-16T02:29:38+09:00
Subject: Re: Rials varable becomes nill on a render.

Thank you.

On 15 Feb 2007, at 16:57, Harris Reynolds wrote:

> This happens because you are calling the render method instead of  
> redirect_to.  Calling render causes the invocation to "render" the  
> new view and the new action (method) is never invoked.  If you  
> change that to redirect_to it will call the action you want.
>
> The net/net is the... render basically passed control to the view,  
> redirect_to passes control to the actual action method.
>
> hope that helps,
>
> ~harris
>
>
>> First off apologies for a rails question on the ruby list, but the
>> rails mailing list sign-on page seems to be down at the moment so I
>> thought I would look for help here.
>
> Bearing in mind I am very new to Rails... I have a create action:
>
> def create
>      @post = Post.new(params[:post])
>      if @post.save
>        @post.tag_with(params[:tag_list])
>        flash[:notice] = 'Post was successfully created.'
>        redirect_to :action => 'list'
>      else
>        @tag_list = params[:tag_list]
>        render :action => 'new'
>      end
>    end
>
> if the @post.save returns false the user is presented with the new
> view again:
>
> def new
>      @tags = Tag.find(:all)
>      @post = Post.new
>    end
>
> On the initial call to new the new view displays a list of tags from
> the array @tags. If the create action fails and the render :action =>
> 'new' line is executed the @tags variable becomes nill
>
> How come this happens? and is there a 'clean' was of keeping the
> @tags variable as it should be no matter how many times the create
> action fails??
>
> Any help will be gratefully received.
>
> David.
>
>
>
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