Re: Keep a collection sorted with sortBy

[Jonas Nicklas]

There isn't currently any great way of doing this that I know of, unfortunately. There are two options which we've used, one is to use a dependent property, like this:

class Post

  @hasMany "comments"

  @property "sortedComments", get: -> @comments.clone().sortBy("title")

The other is to keep the collection sorted through some kind of attached event, like this:

class Post

  @hasMany "comments"

  constructor: ->

    super

    @comments_property.one =>

      @comments.sortBy("title")

      @comments_property.one(arguments.callee)

The reason we're doing this in such a convoluted way, using `one` instead of just using `bind`, is because calling `sortBy` would usually trigger a change event, so it would inifitely recurse.

It's a bit painful at the moment, so I really want to find a better way.

/Jonas

 

On Tue, Apr 16, 2013 at 6:49 PM, <matteop...@gmail.com> wrote:

I would like to keep a collection sorted using sortBy with a specific  property of the model, for example I would like to make so it is always shown sorted in alphabetical orde based on the title property.

How can I achieve this?

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[matteop...@gmail.com]

Thanks for the answer, 

I had tried something like the first solution you posted but didn't work probably because I didn't used `clone`. Why it's necessary to use it?

[Jonas Nicklas]

The reason that `clone` is necessary, is that for some bizarre reason, `sort` is mutative in JavaScript. We kept this behaviour for Serenade Collections, so it's consistent with regular JS.

/Jonas