在填充显然有效的嵌套ObjectId引用(值CastError
)时,在Mongoose中运行{}
,以至于当它们未被阻止时保存到架构。
有兴趣在服务器端解决此问题,以防止将来出现格式错误的数据,但是,我知道不从客户端保存这些值是个好主意。将空对象 保存到具有type: mongoose.Schema.Types.ObjectId
的Mongoose模式并稍后使用填充CastError
的事实是我的主要关注点。
示例数据:
// representation of data in model
{
"_id": /* ObjectId */,
"refA": {} // empty object,
"refB": /* ObjectId */,
"refC": /* ObjectId */
}
示例方法:
// mongoose query with population
function populator(id, cb) {
// find by string or object id
var query = Schema.findById(id);
// population of query
query.populate({
// string of fields to expand
path: 'refA refB refC',
// option to include virtuals
options: {toJSON: {virtuals: true}}
});
// return executed query,
// optional callback
return _.isFunction(cb) ? query.exec(cb) : query.exec();
}
结果错误:
// error in console
{ [CastError: Cast to ObjectId failed for value "[object Object]" at path "_id"]
message: 'Cast to ObjectId failed for value "[object Object]" at path "_id"',
name: 'CastError',
type: 'ObjectId',
value: {},
path: '_id' }
这可能被认为是Mongoose中的一个错误吗?
Mongoose允许将{}
保存到上述架构中。
示例模式:
var schema = mongoose.Schema(mongoose.Schema{
"refA": {type: mongoose.Schema.Types.ObjectId, ref: 'ReferenceA'},
"refB": {type: mongoose.Schema.Types.ObjectId, ref: 'ReferenceB'},
"refC": {type: mongoose.Schema.Types.ObjectId, ref: 'ReferenceC'}
});
方法处理PUT:
var id = /* existing document */,
body = {"refA": {}};
query = Table.findByIdAndUpdate(id, {$set: body}).lean();
query.exec(function(err, record) { /* ... */ });
确定Mongoose不允许将{}
保存为ObjectId类型。在保存新文档/处理POST时,Haven没有经过测试。