[Rails] Re: polymorphic reference deeper ?

Thanks Matt,

Now i just have to figure out how to do the "calling more methods on
the object".
I havent seen or used "#{item.class.name.underscore}" so i guess the
key are in that - hopefully i dig into this.

/Niklas.

On 21 Maj, 17:00, Matt Jones <al2o...@gmail.com> wrote:
> On May 20, 11:48 am, Niklas Nson <niklasn...@meantime.se> wrote:
>
>
>
>
>
> > I have made myself a small activity model like this =>
>
> > # == Schema Information
> > # Schema version: 20110519174324
> > #
> > # Table name: activities
> > #
> > #  id         :integer         not null, primary key
> > #  account_id :integer
> > #  action     :string(255)
> > #  item_id    :integer
> > #  item_type  :string(255)
> > #  created_at :datetime
> > #  updated_at :datetime
>
> > belongs_to :account
> > belongs_to :item, :polymorphic => true
>
> > from this i can get a nice timeline/actions/userfeed or what we want
> > to call it from =>
>
> > def self.get_items(account)
> >   item_list = []
> >    items = where(:account_id => account.id).order("created_at
> > DESC").limit(30)
> >    items.each do |i|
> >      item_list << i.item_type.constantize.find(i.item_id)
>
> Quick note here - this can be more effectively replaced by:
>
> item_list << i.item
>
> since that's the whole point of the :polymorphic => true
> declaration...
>
> > it works like a charm for objects not refering to others - like if a
> > user uploads a new image i can
> > get the image nice and tidy. But for comments => then i want to get
> > the original post info, can i get
> > that in get_items directly ? Someone got tips for me ?
>
> I suspect you'll likely be doing that farther up in the code, where
> the results of get_items are used. For instance, one might do
> something like this:
>
> <%= Activity.get_items(some_account).do |item| %>
>   <%= render :partial => "#{item.class.name.underscore}", :locals =>
> { :item => item } %>
> <% end -%>
>
> then the individual item partials can deal with calling more methods
> on the object.
>
> --Matt Jones

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