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Dark Ambient

2006-Oct-08 16:00 UTC

Passing instance variables in REST

Preface - I''ve had a number of posts regarding my bigger issue but
trying to
break it down into smaller parts.

Here is what I''m not understanding regarding REST -  why I''m
having a hard
time passing an instance variable to another action.
First I added another resource into my routes.
map.resources :searches, :collection => {:userchoices => :get}
In the userchoices I hard coded some conditions on the find(:all).  I want
to make it dynamic though based on the users choice
which is getting saved in the create function as @search = Search.new

 After the save I have { redirect_to userchoices_searches_url(@search)}
but no luck in getting the @search params over to the userchoices actions.

I guess my real question here is why ? and is there anything I could do to
change it.

TIA
Stuart

-- 
http://en.wikipedia.org/wiki/Dark_ambient


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dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org

2006-Oct-08 16:15 UTC

head link

Re: Passing instance variables in REST

Hi --

On Sun, 8 Oct 2006, Dark Ambient wrote:
> Preface - I''ve had a number of posts regarding my bigger issue but
trying to
> break it down into smaller parts.
>
> Here is what I''m not understanding regarding REST -  why
I''m having a hard
> time passing an instance variable to another action.
> First I added another resource into my routes.
> map.resources :searches, :collection => {:userchoices => :get}
> In the userchoices I hard coded some conditions on the find(:all).  I want
> to make it dynamic though based on the users choice
> which is getting saved in the create function as @search = Search.new
>
> After the save I have { redirect_to userchoices_searches_url(@search)}
> but no luck in getting the @search params over to the userchoices actions.
>
> I guess my real question here is why ? and is there anything I could do to
> change it.
This isn''t a REST-related thing; it''s true for all actions.  A
new
action, which includes a redirect, starts with a new instance of the
controller, which means that its instance variables are not
initialized.

It''s like doing this:

   class C
     def an_action
       @x = 1
     end

     def other_action
       puts @x
     end
   end

   C.new.an_action
   C.new.other_action  # nil, not 1

They''re two different instances of C, so they don''t share
instance
variables.  That''s what''s happening with your controller:
it''s being
instantiated (UserController.new, or equivalent) once for each action.

A common technique is to store the id of the result in the session,
and then retrieve it on the next action.


David

-- 
                   David A. Black |
dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org
Author of "Ruby for Rails"   [1] | Ruby/Rails training &
consultancy [3]
DABlog (DAB''s Weblog)        [2] | Co-director, Ruby Central, Inc.  
[4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org

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Dark Ambient

2006-Oct-08 16:27 UTC

head link

Re: Passing instance variables in REST

On 10/8/06, dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org
<dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org>
wrote:>
>
> Hi --
>
> On Sun, 8 Oct 2006, Dark Ambient wrote:
>
> > Preface - I''ve had a number of posts regarding my bigger
issue but
> trying to
> > break it down into smaller parts.
> >
> > Here is what I''m not understanding regarding REST -  why
I''m having a
> hard
> > time passing an instance variable to another action.
> > First I added another resource into my routes.
> > map.resources :searches, :collection => {:userchoices => :get}
> > In the userchoices I hard coded some conditions on the find(:all).  I
> want
> > to make it dynamic though based on the users choice
> > which is getting saved in the create function as @search = Search.new
> >
> > After the save I have { redirect_to userchoices_searches_url(@search)}
> > but no luck in getting the @search params over to the userchoices
> actions.
> >
> > I guess my real question here is why ? and is there anything I could
do
> to
> > change it.
>
> This isn''t a REST-related thing; it''s true for all
actions.  A new
> action, which includes a redirect, starts with a new instance of the
> controller, which means that its instance variables are not
> initialized.
>
> It''s like doing this:
>
>    class C
>      def an_action
>        @x = 1
>      end
>
>      def other_action
>        puts @x
>      end
>    end
>
>    C.new.an_action
>    C.new.other_action  # nil, not 1
>
> They''re two different instances of C, so they don''t share
instance
> variables.  That''s what''s happening with your controller:
it''s being
> instantiated (UserController.new, or equivalent) once for each action.
>
> A common technique is to store the id of the result in the session,
> and then retrieve it on the next action.
>
>
> David

The session sounds like a good way to go.  I understand the explanation BUT
then
if I''m going from the create action to the show action
{ redirect_to search_url(@search)}
that seems to work fine with the id carried over.  So how does that get
explained ?

Stuart


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Dark Ambient

2006-Oct-08 18:08 UTC

head link

Passing instance variables in REST

Preface - I''ve had a number of posts regarding my bigger issue but
trying to
break it down into smaller parts.

Here is what I''m not understanding regarding REST -  why I''m
having a hard
time passing an instance variable to another action.
First I added another resource into my routes.
map.resources :searches, :collection => {:userchoices => :get}
In the userchoices I hard coded some conditions on the find(:all).  I want
to make it dynamic though based on the users choice
which is getting saved in the create function as @search = Search.new

 After the save I have { redirect_to userchoices_searches_url(@search)}
but no luck in getting the @search params over to the userchoices actions.

I guess my real question here is why ? and is there anything I could do to
change it.

TIA
Stuart

-- 
http://en.wikipedia.org/wiki/Dark_ambient


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Rails - Oct 2006 - Passing instance variables in REST

Passing instance variables in REST

Re: Passing instance variables in REST

Re: Passing instance variables in REST

Passing instance variables in REST