如何在Mongoid中运行MongoDB本机查询

Question

Ok, I'd like to query MongoID to check one parameter agains another. Imagine I have start_date and end_date as properties of my Model. I'd like to query Mongoid like so:

Model.where(start_date > end_date)

So how can I do that? If I were to use MongoDB console, I'd do something like (untested):

db.collection.find({$where: "this.end_date > this.start_date"}).count()

Any ideas?

Answer 1

You could try

Model.collection.find('$where' => 'this.end_date > this.start_date') 

or in Mongoid 3 as

Model.where('this.end_date > this.start_date')