Rails - Apr 2008 - Best way to pass ID variable to partials - global var??

I have several orders that are being updated in an internal data entry
app.  I start by going from an order to pop-up form that allows a user
to select items to add to a field in the order.  The pop-up form
contains 2 partials for drag and drop functionality from AWD.  The user
starts by selecting a category in a drop down list.  Then on select, the
first partial is filled with the list of options.  The user can then
drag and drop from the first partial to the second.

Now, my question is how to keep the original order id available to the
partials at all times.

Right now I have a global variable set in the action when the page
loads, but I''m guessing that this might not be the best way to do this.
The first partial needs the order id so that it can look up which items
have already been selected so it doesn''t include those in the option to
select.  The second partial displays all of the items that have been
selected.

Hope this makes sense.

Thanks.
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Becca Girl wrote:
> Right now I have a global variable set in the action when the page
> loads, but I''m guessing that this might not be the best way to do
this.
> The first partial needs the order id so that it can look up which items
> have already been selected so it doesn''t include those in the
option to
> select.  The second partial displays all of the items that have been
> selected.
Use render :partial => ''foo'', :locals => { :@bar =>
bar }.

You can call that from Ajax handlers, and ViewTests, too.

The :0 is a trick that allows _foo.rhtml to check if the variable exists at all:

   if @bar ...

Without that, no element of :locals would be optional, because an if bar on a 
non-existent bar is a syntax error, and checking defined? all the time is
odious!

-- 
   Phlip
   http://www.oreillynet.com/onlamp/blog/2007/07/assert_latest_and_greatest.html


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Phlip wrote:
> Use render :partial => ''foo'', :locals => { :@bar
=> bar }.
> 
> You can call that from Ajax handlers, and ViewTests, too.
> 
> The :0 is a trick that allows _foo.rhtml to check if the variable exists 
> at all:
> 
>    if @bar ...
> 
> Without that, no element of :locals would be optional, because an if bar 
> on a
> non-existent bar is a syntax error, and checking defined? all the time 
> is odious!
> 
I''m not able to make that work.

The id of the order is selected in action 1 which then calls a partial. 
Once the partial is rendered, that partial calls action 2 - this creates 
the drag and drop.  Action 2 needs to be aware of the order id to make 
it available to action 3 when the partials are refreshed with the new 
lists for drag and drop.  I think that I''m missing something to make 
this happen or I have the locals set incorrectly.

I also need to keep in mind that multiple orders will be updated 
throughout the process so it''s not a situation where I can set it and 
forget it.

Are locals still the best way to pass the id to the other actions or do 
I need to set up a method in the model that somehow retains the order 
id?

Thanks.
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>  Are locals still the best way to pass the id to the other actions or do
>  I need to set up a method in the model that somehow retains the order
>  id?
Fix locals or pass things around as instance variables
@id = x

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Roger Pack wrote:
> Fix locals or pass things around as instance variables
> @id = x

I''m still new at this so I apologize for asking such an elementary 
question.

This is what I have and maybe someone can help me figure out where I''m 
going wrong with passing variables.

For this example, let''s say I''m adding fruit to an order.  The
user will
start on an order page, click on a link that opens a pop-up for fruit. 
The pop up gets the order ID from the page the opened the pop up.  The 
pop up contains a select box and 2 partials with drag and drop 
functionality. Let''s say the select box let''s you select by
color of
fruit.  I left off some of the code to shorten the post, but I explained 
what I''m looking for in the actions.


#controller

def get_order
  @order = Order.find(params[:id])
end

def get_fruit_list
  @fruit_list = Items.find_all_by_color(params[:color])

  render :update do |page|
    page.replace_html ''fruit_list'', :partial =>
''fruit_list'', :locals =>
    {:order_id => @order.id }
  end
end


get_fruit_selected
  #order number needed to add the fruit to the order
  @order = Order.find(params[:order_id])

  #code here --> fruit is saved to the order list
  #code here --> both partials are rendered to reflect the added fruit
end


So what I''m missing here is how to pass that ID number from get_order
to
get_fruit selected.

THANKS!
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store it in the session or pass it as a parameter to your popup, I''d
guess.
-R

On Mon, Apr 28, 2008 at 5:47 PM, Becca Girl
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
>  Roger Pack wrote:
>
>  > Fix locals or pass things around as instance variables
>  > @id = x
>
>
>  I''m still new at this so I apologize for asking such an
elementary
>  question.
>
>  This is what I have and maybe someone can help me figure out where
I''m
>  going wrong with passing variables.
>
>  For this example, let''s say I''m adding fruit to an
order.  The user will
>  start on an order page, click on a link that opens a pop-up for fruit.
>  The pop up gets the order ID from the page the opened the pop up.  The
>  pop up contains a select box and 2 partials with drag and drop
>  functionality. Let''s say the select box let''s you select
by color of
>  fruit.  I left off some of the code to shorten the post, but I explained
>  what I''m looking for in the actions.
>
>
>  #controller
>
>  def get_order
>   @order = Order.find(params[:id])
>  end
>
>  def get_fruit_list
>   @fruit_list = Items.find_all_by_color(params[:color])
>
>   render :update do |page|
>     page.replace_html ''fruit_list'', :partial =>
''fruit_list'', :locals =>
>     {:order_id => @order.id }
>   end
>  end
>
>
>  get_fruit_selected
>   #order number needed to add the fruit to the order
>   @order = Order.find(params[:order_id])
>
>   #code here --> fruit is saved to the order list
>   #code here --> both partials are rendered to reflect the added fruit
>  end
>
>
>  So what I''m missing here is how to pass that ID number from
get_order to
>  get_fruit selected.
>
>  THANKS!
>
>
> --
>  Posted via http://www.ruby-forum.com/.
>
>  >
>
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