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); } });
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