Deleting an item with ajax

Ruby
1

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

    <%= render :partial=>'item_list' %>

_item_list.rhtml

<% for item in @list.items %>

  • <%= 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 %>
    • <% 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

    2

    John G. 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

      <%= render :partial=>'item_list' %>

    _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)

    3

    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 R. wrote:

    John G. 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

      <%= render :partial=>'item_list' %>

    _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)

    4

    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 %>

  • <%= @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 G. 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 R. wrote:

    John G. 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

      <%= render :partial=>'item_list' %>

    _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)