猫鼬无效的callback（）参数错误

Question

I have a collection like this (very simplified)...

var parentSchema = new mongoose.Schema({
    firstName: String,
    mobile: String
});

var familySchema = new mongoose.Schema({
    groupId: { type: mongoose.Schema.Types.ObjectId, index: true },
    parents: [parentSchema]
});

For a given group, I'd like to find all of the parents of families in that group who have a mobile value set (exists), and unset those mobile values.

I've been able to piece this much together by looking at other examples...

Family.update(
    { groupId: someGroupId, "parents.mobile": {"$exists":"true"} },
    { $unset : { "parents.$.mobile" : 1 } }, false, true
).then(function() {
    // do other stuff
});

Running generates the error:

Trace: [Error: Invalid callback() argument.]

I've tried several variations, but this one seems the most correct to me.

Answer 1

The .update() signature for mongoose models is:

Model.update(<{query}>,<{update}>,[<{options}>],[callback])

So when using promises, it's just the first two with the optional "third" options . The "fourth" would be a callback function, and hence the error:

Family.update(
    { "groupId": someGroupId, "parents.mobile": {"$exists": true } },
    { "$unset": { "parents.$.mobile" : "" } },
    { "multi": true }
).then(function() {

Too many people read the "shell" signature , even though the usage of:

.update(<{query}>,<{update}>,<upsert>,<multi>)

Has been deprecated in favour of the standard "options" arrangement for some time.

Always refer to the method that actually applies to your language API.