我发现我可以克隆 Ember 数据记录并复制其属性,但没有任何 belongsTo
/hasMany
关系被克隆。如果我不知道可能存在什么关系,脱离现有的关系,我可以以某种方式做到这一点吗?
作为引用,以下是我将克隆 Ember 数据记录属性的内容:
var attributeKeys = oldModel.get('constructor.attributes.keys.list');
var newRecord = this.get('store').createRecord(oldModel.constructor.typeKey);
newRecord.setProperties(oldModel.getProperties(attributeKeys));
最佳答案
对 Daniel 的 answer 进行了一些改进为了安全起见,它允许提供覆盖并清除新记录的 ID。另外,我不喜欢在克隆方法中调用 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);
}
});
关于ember.js - 如何克隆 Ember 数据记录,包括关系?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20007049/