Rails - Apr 2007 - How to: programmatically choose a partial to render

I have a scenario where after updating a section on a page with a
partial, I then need to update that same area with a new partial.  This
is easy, however, at this stage I need to display partial A if the user
is logged in, and B if the user is not logged in.

How do I programmatically decide which partial to render?

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On Apr 5, 2007, at 05:28 , Arch Stanton wrote:
> I have a scenario where after updating a section on a page with a
> partial, I then need to update that same area with a new partial.   
> This
> is easy, however, at this stage I need to display partial A if the  
> user
> is logged in, and B if the user is not logged in.
>
> How do I programmatically decide which partial to render?
render(:partial => (user.logged_in? ? ''foo'' :
''bar''))

and there''s also some more readable but more verbose variants, I  
imagine.

--
Jakob Skjerning - http://mentalized.net



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Jakob Skjerning wrote:
> On Apr 5, 2007, at 05:28 , Arch Stanton wrote:
> 
>> I have a scenario where after updating a section on a page with a
>> partial, I then need to update that same area with a new partial.   
>> This
>> is easy, however, at this stage I need to display partial A if the  
>> user
>> is logged in, and B if the user is not logged in.
>>
>> How do I programmatically decide which partial to render?
> 
> render(:partial => (user.logged_in? ? ''foo'' :
''bar''))
> 
> and there''s also some more readable but more verbose variants, I
> imagine.
> 
> --
> Jakob Skjerning - http://mentalized.net
I have the action "logged_in?" defined in my User class, but when I
call
user.logged_in? I get an error:

ActionView::TemplateError (undefined method `logged_in?'' for
User:Class)



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Arch Stanton wrote:
> I have the action "logged_in?" defined in my User class, but when
I call
> user.logged_in? I get an error:
> 
> ActionView::TemplateError (undefined method `logged_in?'' for
User:Class)
So the question really is "How to check if a user is logged in"? It 
looks like you''re trying to call logged_in? on the User class. For that
to work your logged_in? method needs to be a class method. Ie it has to 
be defined with def self.logged_in? or something to that effect.

http://www.rubycentral.com/book/tut_classes.html has more information.

-- 
Jakob Skjerning - http://mentalized.net

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Jakob Skjerning wrote:
> Arch Stanton wrote:
>> I have the action "logged_in?" defined in my User class, but
when I call
>> user.logged_in? I get an error:
>> 
>> ActionView::TemplateError (undefined method `logged_in?'' for
User:Class)
> 
> So the question really is "How to check if a user is logged in"?
It
> looks like you''re trying to call logged_in? on the User class. For
that
> to work your logged_in? method needs to be a class method. Ie it has to
> be defined with def self.logged_in? or something to that effect.
> 
> http://www.rubycentral.com/book/tut_classes.html has more information.
> 
> --
> Jakob Skjerning - http://mentalized.net
Ya this question has opened a whole can of worms actually ;)

I did create a class method, but I made the mistake of checking the 
session, which  the model does not have access to.

So I''m trying to rethink the entire problem.

What is the better route here:

Create a class method User.logged_in? and pass the session, or create a 
controller action . . . but then I wonder, can I call a controller 
action from the template.  Still trying to understand the framework.


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I am specifying layout based on login, which is similar to what you
are doing...

I have this method in my ApplicationController
def logged_in_user
  @logged_in_user ||= User.find session[:user]
end

To check if someone is logged in I write "if logged_in_user" but you
can add a method to ApplicationController like this...

def logged_in?
  logged_in_user ? true : false
end

On Apr 6, 7:41 am, Arch Stanton
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Jakob Skjerning wrote:
> > Arch Stanton wrote:
> >> I have the action "logged_in?" defined in my User class,
but when I call
> >> user.logged_in? I get an error:
>
> >> ActionView::TemplateError (undefined method `logged_in?''
for User:Class)
>
> > So the question really is "How to check if a user is logged
in"? It
> > looks like you''re trying to call logged_in? on the User
class. For that
> > to work your logged_in? method needs to be a class method. Ie it has
to
> > be defined with def self.logged_in? or something to that effect.
>
> >http://www.rubycentral.com/book/tut_classes.htmlhas more information.
>
> > --
> > Jakob Skjerning -http://mentalized.net
>
> Ya this question has opened a whole can of worms actually ;)
>
> I did create a class method, but I made the mistake of checking the
> session, which  the model does not have access to.
>
> So I''m trying to rethink the entire problem.
>
> What is the better route here:
>
> Create a class method User.logged_in? and pass the session, or create a
> controller action . . . but then I wonder, can I call a controller
> action from the template.  Still trying to understand the framework.
>
> --
> Posted viahttp://www.ruby-forum.com/.

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reed wrote:
> I am specifying layout based on login, which is similar to what you
> are doing...
> 
> I have this method in my ApplicationController
> def logged_in_user
>   @logged_in_user ||= User.find session[:user]
> end
> 
> To check if someone is logged in I write "if logged_in_user" but
you
> can add a method to ApplicationController like this...
> 
> def logged_in?
>   logged_in_user ? true : false
> end
> 
> On Apr 6, 7:41 am, Arch Stanton
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
I must have some confusion around how to access controller methods from 
a view.

I''m calling

4: <% if logged_in? -%>

From an rhtml, but I get the error: ActionView::TemplateError (undefined 
method `logged_in?'' for #<#<Class:0x48d2c60>:0x48d2c38>)

I have that method defined in my Application Controller.

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On Apr 6, 2007, at 00:21 , Arch Stanton wrote:
> From an rhtml, but I get the error: ActionView::TemplateError  
> (undefined
> method `logged_in?'' for
#<#<Class:0x48d2c60>:0x48d2c38>)
>
> I have that method defined in my Application Controller.
You need to expose the controller method to your view by using  
helper_method <http://api.rubyonrails.org/classes/ActionController/ 
Helpers/ClassMethods.html#M000165>.

--
Jakob Skjerning - http://mentalized.net



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