[英]Check if backbone has been fetched, or changed?
I need to have two url
properties inside my Backbone.Collection.extend()
because if a collection is fetched
then I need to use a specific url
if the collection gets a new model then I want to change the url
我需要在
Backbone.Collection.extend()
包含两个url
属性,因为如果fetched
了一个集合,那么如果该集合获得了一个新模型,那么我需要使用一个特定的url
,那么我想更改该url
module.exports = MessagesCollection = Backbone.Collection.extend({
initialize: function(models, options) {
this.id = options.id;
},
url: function() {
if (fetch method is called) {
return '/api/messages/' + this.id;
} else {
// here if a model is being added?
return '/api/messages'
}
},
model: MessageModel
});
The reason for this is because I only want to pull down the models from the server based on the user. 这样做的原因是因为我只想根据用户从服务器下拉模型。
var me = new MeModel();
me.fetch({
success: function(response) {
App.data.me = me;
var messages = new MessagesCollection([], { id: response.get('user_id') });
messages.fetch({
success: function() {
App.data.messages = messages;
App.core.vent.trigger('app:start');
}
});
}
});
When the user creates a new model within the app I want it to go into the main collection? 当用户在应用程序中创建新模型时,我希望它进入主集合吗?
Does this mean I should create a sub collection based on the main collection somehow? 这是否意味着我应该以某种方式基于主集合创建一个子集合?
Edit: 编辑:
My create looks like this somewhere else in the app window.App.data.messages.create(Message);
我的创建在应用程序
window.App.data.messages.create(Message);
其他地方看起来像这样window.App.data.messages.create(Message);
I am thinking maybe I could write something like 我在想也许我可以写一些像
var me = new MeModel();
me.fetch({
success: function(response) {
App.data.me = me;
var messages = new MessagesCollection([], { id: response.get('user_id') });
var allMessages = new MessagesCollection();
messages.fetch({
success: function() {
App.data.messages = messages;
App.data.allMessages = allMessages;
App.core.vent.trigger('app:start');
}
});
}
});
Then create window.App.data.allMessages.create(Message);
然后创建
window.App.data.allMessages.create(Message);
> It sounds like it can cause problems IDK any ideas? >听起来IDK可能会引起问题吗?
Edit: 编辑:
The above worked but I had to create a new Backbone.Collection.extend()
passing the same model but just writing it like 上面的工作,但我不得不创建一个新的
Backbone.Collection.extend()
传递相同的模型,但只是像
var Backbone = require('backbone'),
MessageModel = require('../models/message');
module.exports = AllMessagesCollection = Backbone.Collection.extend({
model: MessageModel,
url: '/api/messages'
});
So let me really break this question down, is this solution problematic. 因此,让我真正分解这个问题,这个解决方案是否有问题。 What is the best way to do this?
做这个的最好方式是什么? The worst thing I can think of is bandwidth, using this method I would constantly be sending requests!
我能想到的最糟糕的事情是带宽,使用这种方法,我将不断发送请求!
If you need to use different url only when create new model you can override collection.create
method: 如果仅在创建新模型时需要使用其他url,则可以覆盖
collection.create
方法:
var MessagesCollection = Backbone.Collection.extend({
initialize: function(models, options) {
this.id = options.id;
},
url: function() {
return '/api/messages/' + this.id;
},
create: function(model, options){
var extendedOptions = _.extend(options || {}, {url: '/api/messages'});
return this.constructor.__super__.create.call(this, model, extendedOptions);
}
});
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