Using the pluck method, we can extract an array of attributes from each model in a Backbone collection.
var idsInCollection = collection.pluck('id'); // returns ["id1","id2"...]
I am curious to know if there is a method that can assign an attribute to each model in the collection.
var urlArray = ["https://url1", "https://url1" ...];
collection.WHAT_IS_THIS_METHOD({"urls": urlArray});
There isn't a direct method available, but using the invoke function allows you to achieve a similar result in a concise manner:
collection.invoke('set', {"urls": urlArray});
For a more reusable approach, you can implement a custom set method for all your collections like so:
var YourCollection = Backbone.Collection.extend({
set: function(attributes) {
this.invoke('set', attributes);
// Please note that this may require additional modifications to support set(key, value) syntax
}
});
* UPDATE *
It's worth mentioning that Backbone has introduced its own set method, and overriding it can potentially disrupt the functionality of your Collection. Therefore, it's advisable to rename the custom method to something like setModelAttributes to avoid conflicts.
There might not be a specific technique for achieving this, but you could experiment with the following approach:
collection.forEach(function(item, position) {
item.update(link, linkArray[position]);
});
Building upon the previous response from David, a convenient way to incorporate this functionality is by creating a custom method within the collection itself. Below is an example of how I would implement this using CoffeeScript:
class CustomCollection extends Backbone.Collection
setAll: () ->
_args = arguments
@models.forEach (model) -> model.set _args...
class AnotherCollection extends CustomCollection
url: '/another-endpoint.json'
myCustomCollection = new AnotherCollection()
myCustomCollection.fetch
success: (collection, response) ->
collection.setAll someProperty: true
collection.setAll anotherProperty, 'example'
If you prefer to achieve the same result in vanilla JavaScript without utilizing classes or splats, you can write it as follows:
var CustomCollection = Backbone.Collection.extend({
setAll: function () {
var _args = arguments;
this.models.forEach(function (model) {
model.set.apply(model, _args);
});
}
});
After reviewing machineghost's version, I decided to share my slightly modified approach. In this method, I have utilized lodash's invokeMap function instead of underscore's invoke. It follows the same syntax as the standard model.set method, allowing for ('prop', 'val') or ({prop: 'val', prop: 'val'}) inputs, as well as accepting and passing an options object.
var CustomCollection = Backbone.Collection.extend({
setModels: function(key, val, options) {
var attrs;
if (typeof key === 'object') {
attrs = key;
options = val;
} else {
(attrs = {})[key] = val;
}
if (attrs) {
_.invokeMap(this, 'set', attrs, options);
}
return this;
}
});
If you follow the syntax suggested on the underscore site, you should use _.invoke(list, methodName, *arguments) http://underscorejs.org/#invoke
Therefore, the function provided by machineghost should be
collection.invoke({'url': someURL},'set');
I hope this information is helpful :)
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