Ember - 观察创建/删除记录 [英] Ember — observe for creation/deletion of records
问题描述
Dog
和 Cat
。 现在,每当我创建新的 Cat
记录(或删除现有的记录)时,我想要 Dog
控制器观察创建/删除记录,当新的 Cat
记录被创建时,我希望它触发一些动作(例如控制台.log('Bark!')
)。
我不想从 Cat
controller to
Dog
控制器直接在这种情况下;我想要 Dog
控制器自己负责。如果有可能,是否有任何方式可以从 Dog
控制器的角度来判断是创建还是删除记录?
任何想法如何做?
使用Ember数据
在狗/猫控制器上,您可以创建猫/狗集合的引用。
我们假设您正在创建狗控制器>
App.DogRoute = Em.Route.extend({
model:function(){
return this.store .find('dog');
},
setupController:function(controller,model){
this._super(controller,model);
controller.set('cats ',this.store.all('cat'));
}
});
App.DogController = Em.ArrayController.extend({
catsChanged:function(){
} .observes('cats')
} );
此外,您可以添加一个数组观察器,观察项目如何更改。
App.DogRoute = Em.Route.extend({
model:function(){
return this.store.find 'dog');
},
setupController:function(controller,model){
this._super(controller,model);
var all = this.store.all 'cat');
controller.set('cats',all);
all.addArrayObserver(controller);
}
});
App.DogController = Em.ArrayController.extend({
arrayWillChange:function(array,start,removeCount,addCount){
console.log(arguments);
},
arrayDidChange:function(array,start,removeCount,addCount){
console.log(arguments);
}
});
使用需求并观看控制器
App.CatsController = Em.ArrayController.extend({
需要:'dog',
dogs:Em.computed.alias('controllers.dogs'),
dogsChanged:function(){
console.log('dogs changed');
} .observes('dogs。[]')
});
App.DogsController = Em.ArrayController.extend({
需要:'cat',
cats:Em.computed.alias('controllers.cats' )
catsChanged:function(){
console.log('cats changed');
} .observes('cats。[]')
});
Let's say I have 2 independent set of controllers/models: Dog
and Cat
.
Now, whenever I create new Cat
record (or delete existing one) I want Dog
controller to observe for creation/deletion of the record and when new Cat
record is created I want it to fire some action (for example console.log('Bark!')
).
I don't want to send action from Cat
controller to Dog
controller directly in this case; I want Dog
controller to be responsible for itself. In case it is possible, is there any way to tell from the Dog
controllers point of view whether a record was created or deleted?
Any ideas how to do that?
Using Ember Data
On the dog/cat controller you can create a reference to the cat/dog collection.
let's assume you're creating the dog controller
App.DogRoute = Em.Route.extend({
model: function(){
return this.store.find('dog');
},
setupController: function(controller, model){
this._super(controller,model);
controller.set('cats', this.store.all('cat'));
}
});
App.DogController = Em.ArrayController.extend({
catsChanged: function(){
}.observes('cats')
});
Additionally you could add an array observer and watch how the items are changing.
App.DogRoute = Em.Route.extend({
model: function(){
return this.store.find('dog');
},
setupController: function(controller, model){
this._super(controller,model);
var all = this.store.all('cat');
controller.set('cats', all);
all.addArrayObserver(controller);
}
});
App.DogController = Em.ArrayController.extend({
arrayWillChange: function(array, start, removeCount, addCount) {
console.log(arguments);
},
arrayDidChange: function(array, start, removeCount, addCount) {
console.log(arguments);
}
});
Using needs and watching the controller
App.CatsController = Em.ArrayController.extend({
needs: 'dog',
dogs: Em.computed.alias('controllers.dogs'),
dogsChanged: function(){
console.log('dogs changed');
}.observes('dogs.[]')
});
App.DogsController = Em.ArrayController.extend({
needs: 'cat',
cats: Em.computed.alias('controllers.cats'),
catsChanged: function(){
console.log('cats changed');
}.observes('cats.[]')
});
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