Rails - Oct 2006 - diff between redirect_to :action and calling action/render?

I''ve seen these two constructs used in different places and was 
wondering if someone could explain the differences in use, ie why one or 
the other in specific situations...

def index
 redirect_to :action => ''list''
end

or

def index
 list
 render :action => ''list''
end


thanks.
c.

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redirect sends back a response to the browser telling it to load a new 
url instead of the one requested, whereas render doesn''t(since it just 
changes the template used

Fred

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Thanks for the quick response, Frederick.


soooo...

In first case the URL in the browser will say:

  http://site.com/controller/list

and in the second it will say:

  http://site.com/controller/index?


But otherwise the net result of what code is processed and what content 
is displayed is the same?

Thanks.
c.


Frederick Cheung wrote:
> redirect sends back a response to the browser telling it to load a new 
> url instead of the one requested, whereas render doesn''t(since it
just
> changes the template used
> 
> Fred

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Some of the consequences of using render is that the browser''s url  
remains whatever what was used to generate the request. redirect,  
since it asks the browser to generate a new request, has the side  
effect of changing the browser''s url. This allows you to do things  
that are more resilient to users using the back button or hitting  
reload. The pattern is called "Redirect after Post" and you can  
google it to find out more details.

In short, if you''ve done some kind of operation that changes the  
state of the system, such as updating or creating a model object, you  
should redirect to different page. Thus, hitting reload on the  
browser won''t try to update the system again.

Hope it helps,

-Anthony

On Oct 12, 2006, at 9:04 AM, Frederick Cheung wrote:
>
> redirect sends back a response to the browser telling it to load a new
> url instead of the one requested, whereas render doesn''t(since it
just
> changes the template used
>
> Fred
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
> 
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Cayce Balara wrote:
> Thanks for the quick response, Frederick.
> 
> 
> soooo...
> 
> In first case the URL in the browser will say:
> 
>   http://site.com/controller/list
> 
> and in the second it will say:
> 
>   http://site.com/controller/index?
> 
that is correct.
> 
> But otherwise the net result of what code is processed and what content 
> is displayed is the same?
That should normally be the case.
An example of when you would want to do a redirect rather than a render 
would be if you had an an action that added something to your list: if 
you do a render then if the user does a refresh then they will call your 
add action, whereas if you redirect to the list action in the add action 
then refreshing the page will just show the list again, rather than 
calling add again.

Fred

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Cayce Balara wrote:
> Thanks for the quick response, Frederick.
>
>
> soooo...
>
> In first case the URL in the browser will say:
>
>   http://site.com/controller/list
>
> and in the second it will say:
>
>   http://site.com/controller/index?
>
>
> But otherwise the net result of what code is processed and what content
> is displayed is the same?
>
> Thanks.
> c.
....uhm... not exactly.

- redirect_to makes the browser load a new page, and the result is the
same as if the user manually nagivated to this URL or entered it in the
address field of his browser.
so to stick to your example: once the browser has requested the new
page he has been redirected to (controller/list), the "list" action
will be executed, and then the corresponding view will be parsed and
filled with the data made available to it in the action.

- render will only render the view of the "list" action (list.rhtml)
without calling the "list" action first. So you would have to make
some
data availabe in the index action that can be parsed in the "list"
view
file, which would not be very DRY (Don''t repeat Yourself)


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Things are coming very clear - thanks to everyone for input.

c.

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