From: John Griffiths <indiehead@...>
Date: 2007-09-20T06:00:24+09:00
Subject: Re: deleting an item with ajax

sorted...

  def destroy_item
    Item.find(params[:id]).destroy

    @list = List.find(params[:list])
    render :partial => 'item_list', :object => @list
  end


<% for @item in @list.items %>
  <li id="item_<%= @item.id %>"><%= @item.body %>
  <%= link_to_remote "[Destroy]", :update => "items",
      :url => { :action => "destroy_item", :id => @item.id, :list => 
@item.list_id } %>
<% end %>



little did i know in rails you can actually send more than one parameter 
on an action.

so here, the first is the :id of the item you want to delete, and the 
:list is the list it's connected to, which you'll use to regenerate in 
the show action / page.

enjoy!


John Griffiths wrote:
> Thanks Shai, I spent a bit last night going through all my rails books 
> trying to piece together in my mind how the form_remote_tag works, 
> learnt a lot.
> 
> Understand what your saying and see where I'm going wrong, will try 
> changing it.
> 
> And yes, i'll post in the appropriate forum in the future.
> 
> Thanks, your a pal.
> 
> 
> John.
> 
> Shai Rosenfeld wrote:
>> John Griffiths wrote:
>>> hi again, I managed to work out how to create a new item via ajax and
>>> the form_remote_tag, however don't know how to delete an item from the
>>> table.
>>> 
>>> here's the code so far, doesn't work, keeps on popping up saying null.id
>>> 
>>>   <ul id='item_list'>
>>>     <%= render :partial=>'item_list' %>
>>>   </ul>
>>> 
>>> 
>>> _item_list.rhtml
>>> 
>>>   <% for item in @list.items %>
>>> ....
>>>   <% end %>
>>> 
>>>   def destroy_item
>>>     Item.find(params[:id]).destroy
>>>     render :partial=>'list'
>>>   end
>> 
>>> found (e.g. it doesn't know which item to destroy).
>> ..no, the item was destroyed, but when it tried rendering the partial 
>> again (via ajax Update) there was no item defined, as yo didn't add a 
>> @list variable, therefore there is no item in the loop, when it is 
>> rendered secondly.
>> 
>> add a @list variable to the destroy_item action and u should be ok.
>> btw, better to post on the ruby on rails forum (forum#3 rather than 
>> forum#4)

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