ember.js - 如何克隆 Ember 数据记录，包括关系？

Question

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));

Answer 1

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);
    }
});