Why Mongoose doesn't validate on update?
mongoose
Solution
You're not doing anything wrong, `validation` is implemented as internal middleware within Mongoose and middleware doesn't get executed during an `update` as that's basically a pass-through to the native driver.
If you want your client update validated you'll need to `find` the object to update, apply the new property values to it (see underscore's `extend` method), and then call `save` on it.
Mongoose 4.0 Update
As noted in the comments and victorkohl's answer, Mongoose now support the validation of the fields of `$set` and `$unset` operators when you include the `runValidators: true` option in the `update` call.
Problem
I have this code ``` var ClientSchema = new Schema({ name: {type: String, required: true, trim: true} }); var Client = mongoose.model('Client', ClientSchema); ``` Using express, I create a new client with this code ``` var client = new Client(req.body); client.save(function(err, data) { .... }); ``` If I leave the name field empty on the form, mongoose doesn't allow to create the client because I set it as required on the schema. Also, if I leave spaces before and after the name, mongoose delete that spaces before save. Now, I try to update a client with this code ``` var id = req.params.id; var client = req.body; Client.update({_id: id}, client, function(err) { .... }); ``` It let me to change the name, but if I leave it empty on the form, mongoose doesn't validate and save an empty name. If I add empty spaces before and after the name, it save the name with spaces. Why mongoose validate on save but not on update? I'm doing it in the wrong way? mongodb: 2.4.0 mongoose: 3.6.0 express: 3.1.0 node: 0.10.1