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comp.lang.ruby

deleting an item with ajax

John Griffiths

9/8/2007 9:33:00 PM

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
found (e.g. it doesn't know which item to destroy).

show.rhtml

<ul id='item_list'>
<%= render :partial=>'item_list' %>
</ul>


_item_list.rhtml

<% for item in @list.items %>
<li id="item_<%= item.id %>"><%= item.body %>
<%= link_to_remote "delete", :update => "item_list",
:url => { :action => "destroy", :id => item.id }
<%= link_to_remote 'delete', { :action => 'destroy_item', :id =>
item.id }, :confirm => 'Are you sure?', :method => :post %>
</li>
<% end %>



item.rb (model)

class Item < ActiveRecord::Base
#validates_presence_of :body

belongs_to :list

acts_as_list :scope => :list
end


list.rb (controller)

def destroy_item
Item.find(params[:id]).destroy
render :partial=>'list'
end


any ideas?

think i'm nearly there, just don't know where i'm going wrong?

appreciate it
--
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3 Answers

Shai Rosenfeld

9/9/2007 9:04:00 AM

0

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)
--
Posted via http://www.ruby-....

John Griffiths

9/9/2007 11:32:00 AM

0

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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John Griffiths

9/19/2007 9:00:00 PM

0

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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