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Backbone: reverse collection order with comparator


Backbone: reverse collection order with comparator

By : Alex
Date : November 29 2020, 01:01 AM
this one helps. I'm building a Backbone app which displays a list of books, but when I add a new book, through the Edit view, he goes to the bottom of the list instead to the top. So basically I want to reverse the order of my collection with a Comparator but what I tried it's not working: , Why not a simple prepend instead of append
code :


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Backbone collection comparator

Backbone collection comparator


By : ESKrueger
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm using backbone and marionette, , The problem is that you're using a bound function as the comparator:
code :
comparator : (item) =>
if (_.isString(this.comparator) || this.comparator.length === 1) {
  this.models = this.sortBy(this.comparator, this);
} else {
  this.models.sort(_.bind(this.comparator, this));
}
class C
    m1: (x) -> x
    m2: (x) => x

c = new C
console.log(c.m1.length)
console.log(c.m2.length)
class C
    m: (x) => x
__bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
comparator: (item) -> item.id
Backbone Collection is Half-Sorted When Comparator is Used

Backbone Collection is Half-Sorted When Comparator is Used


By : hien beng
Date : March 29 2020, 07:55 AM
like below fixes the issue I am using backbone's collection model to display a sorted list of strings on a backbone view. Here is the model and the comparator: , Here is a working code.
code :
var MenuItems = Backbone.Collection.extend({
    comparator: function (a, b) {
        if (a.get('name') < b.get('name')) {
            return -1;
        } else if (a.get('name') > b.get('name')) {
            return 1;
        }
    }
});
Backbone.js collection comparator not sorting by number

Backbone.js collection comparator not sorting by number


By : P Frank
Date : March 29 2020, 07:55 AM
To fix this issue After much digging, it looks like the collection was actually sorting, it just wasn't doing a full re-render after each new fetch({remove: false}). I added a listener to the CompositeView like so:
code :
class MyClass extends Marionette.CompositeView
  ...
  initialize: ->
    @collection.on "sync", () => @render()
Backbone: reverse string comparator

Backbone: reverse string comparator


By : user3718688
Date : March 29 2020, 07:55 AM
hope this fix your issue Well, specifying .comparator really just delegates to _.sortBy as the docs specify which just calls _.property. So no, you can pass a function (a _.pluck with a - between the arguments in the reverse order) but I suspect you already know this.
Can Backbone render a collection in reverse order?

Can Backbone render a collection in reverse order?


By : xv6prob
Date : March 29 2020, 07:55 AM
I hope this helps . To go through collection in the reverse order I usually use a construction like this:
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