Running native mongodb commands in rails

Question

I'm using Mongoid, but all I need to do is increment a field which is an integer. Would it be worth it for me to skip using Mongoid's methods, and just run the mongodb ruby drivers method to increment a value?

How would I do that?

Tyler Brock · Accepted Answer · 2012-03-22 14:30:34Z

2

Mu is too short is correct, you could either use the built in mongoid #inc method:

Model.inc(:field, integer)

Or you could access the collection directly via the collection attribute:

Model.collection.update(
  { query document },
  { "$inc" => { :field => value } }
)

answered Mar 22, 2012 at 14:30

Tyler Brock

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mu is too short · Accepted Answer · 2012-03-22 06:10:09Z

2

Why not use Mongoid's inc method?

Model#inc

Performs MongoDB's $inc modifier which increments it's value by the supplied amount or initializes it to that value. If the field is not numeric an error will be raised.

So doing model.inc(:a, 11) should send an { $inc: { a: 11 } } update straight into MongoDB.

answered Mar 22, 2012 at 6:10

mu is too short

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