我已经发现我可以克隆Ember数据记录并复制其属性,但是没有任何belongsTo / hasMany关系被克隆.如果我不知道什么样的关系可能会脱离现有的关系,我能以某种方式这样做吗？
作为参考,这里是我将克隆Ember数据记录的属性：
var attributeKeys = oldModel.get('constructor.attributes.keys.list');
var newRecord = this.get('store').createRecord(oldModel.constructor.typeKey);
newRecord.setProperties(oldModel.getProperties(attributeKeys));
解决方法
Daniel’s
answer的一些改进允许提供覆盖,并清除新记录的id,以确保安全.此外,我不想在克隆方法中调用save,而是将其留给调用者.
DS.Model.reopen({
clone: function(overrides) {
var model = this,attrs = model.toJSON(),class_type = model.constructor;
var root = Ember.String.decamelize(class_type.toString().split('.')[1]);
/*
* Need to replace the belongsTo association ( id ) with the
* actual model instance.
*
* For example if belongsTo association is project,the
* json value for project will be: ( project: "project_id_1" )
* and this needs to be converted to ( project: [projectInstance] )
*/
this.eachRelationship(function(key,relationship) {
if (relationship.kind == 'belongsTo') {
attrs[key] = model.get(key);
}
});
/*
* Need to dissociate the new record from the old.
*/
delete attrs.id;
/*
* Apply overrides if provided.
*/
if (Ember.typeOf(overrides) === 'object') {
Ember.setProperties(attrs,overrides);
}
return this.store.createRecord(root,attrs);
}
});
