我有嵌入式文档更新的问题.
我定义的方案：
var Talk = new Schema({
title:{type: String,required: true},content: {type: String,date: { type: Date,comments: { type: [Comments],required: false},Vote: { type: [VoteOptions],});
var VoteOptions = new Schema({
option: {type: String,required: true },count: {type: Number,required: false }
});
现在我想更新Vote.count,给定的Talk ID和VoteOption id.我有以下功能来完成这项工作：
function makeVote(req,res){
Talk.findOne(req.params.id,function(err,talk) {
for (var i=0; i <talk.Vote.length; i++){
if (talk.Vote[i]._id == req.body.Vote){
talk.Vote[i].count++;
}
}
talk.save(function(err){
if (err) {
req.flash('error','Error: ' + err);
res.send('false');
}
else
{
res.send('true');
}
});
});
}
一切执行,我得到res.send(‘true’),但是count的值不会改变.
当我做了一些console.log我看到它改变了价值,但talk.save不保存在db.
另外我很不高兴的循环只是找到_id的嵌入式文档.在mongoose文档中,我阅读了关于talk.Vote.id(my_id),但这给我没有id功能的错误.
解决方法
当更新混合类型(这似乎不是基本类型,也包括嵌入式文档)时,必须在文档上调用.markModified.在这种情况下,它将是：
talk.markModified("Vote"); // mention that `talk.Vote` has been modified
talk.save(function(err) {
// ...
});
希望这能帮助未来的人,因为我找不到答案很快.
Reference:
… Mongoose loses the ability to auto detect/save those changes. To “tell” Mongoose that the value of a Mixed type has changed,call the
.markModified(path)method of the document passing the path to the Mixed type you just changed.