Validating Through Relationships

[nich...@originalmachine.com]

In my application, a User has many Posts. I've setup the relation, to I can populate the User's Posts or get the User's information from a Post - but one question remains:

How can I ensure that the User doesn't create the same Post twice? For instance, the Post's title needs to be unique. But it shouldn't be globally unique, just unique to that User.

Any tips on how to implement this?

[Jason Crawford]

Mongoose has a whole validation subsystem, and you can write arbitrary validation functions:

http://mongoosejs.com/docs/validation.html

Hope that helps,

Jason

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[Nicholas Young]

Yeah, I'm familiar with the custom validation functions that Mongoose provides. I was just wondering if anyone had tips on implementing the validation case I described and could guide me with best practices. 

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[Joe Wagner]

You could potentially use a unique compound index.  Depending on what your schemas look like, you could do something like this:

var userSchema = {
    ...
};

var postSchema = {
    user: {type: mongoose.Schema.ObjectId, ref: 'User'},
    title: String,
    ...
};

postSchema.index({user: 1, title: 1}, {unique: true});