Rails - Oct 2006 - Setting a variable for view

I''d like to set a value somewhere to let the view know if it is in
"add
new" mode or "Update" mode. Depending on the mode, one line of
text in
the view is to be presented differently (e.g. <% if updateMode == true 
%>).

This brings up a couple of questions:
Where is the best place to store that value?
What is the proper way to set the value in the controller and to 
retrieve it in the view?

Thanks in advance
---Michael

-- 
Posted via http://www.ruby-forum.com/.

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Hi --

On Sun, 22 Oct 2006, Michael Satterwhite wrote:
>
> I''d like to set a value somewhere to let the view know if it is in
"add
> new" mode or "Update" mode. Depending on the mode, one line
of text in
> the view is to be presented differently (e.g. <% if updateMode == true
> %>).
>
> This brings up a couple of questions:
> Where is the best place to store that value?
> What is the proper way to set the value in the controller and to
> retrieve it in the view?
Instance variables set in the controller are visible in the view.  So
you would want to do:

   # Controller:

   def my_action
     @update_mode = true
     ...
   end

   # View:

   <% if @update_mode %>
     ...
   <% end %>

(Note that you don''t need "== true".)

Mind you, if you find yourself doing this a lot, it''s probably a sign
that you should reorganize your actions and views, perhaps by
splitting off an update sequence.  I''ve run into situations like that
with @admin_session and other such flags: I realize eventually that
I''m really trying to squeeze two separate use cases into one view,
where it might be better, and scale better, to have a separate suite
of admin tools.


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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Hi Michael,

Michael Satterwhite wrote:
>
> I''d like to set a value somewhere to let the view
> know if it is in "add new" mode or "Update" mode.
> Depending on the mode, one line of text in the view
> is to be presented differently (e.g. <% if updateMode == true
> %>).
The simplest approach might be to set an instance variable (e.g., 
@updateMode) in your controller and then do a check (e.g.,<% if 
!@updateMode.nil? %>) in the view to figure out where you are.

hth,
Bill 

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If this specific issue as what you''re addressing, how about:

if @my_model_object.new_record?
   # do new code
else
   # do edit code
end

of if you are just changing the button names, use something like:

<%= submit_button(my_model_object.new_record? ? ''add new'' :
''update
now'') %>

Yes?

On Oct 22, 2006, at 12:53 PM, Michael Satterwhite wrote:
>
> I''d like to set a value somewhere to let the view know if it is in
> "add
> new" mode or "Update" mode. Depending on the mode, one line
of text in
> the view is to be presented differently (e.g. <% if updateMode == true
> %>).
>
> This brings up a couple of questions:
> Where is the best place to store that value?
> What is the proper way to set the value in the controller and to
> retrieve it in the view?
>
> Thanks in advance
> ---Michael
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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