Question

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I’m getting a bit confuse with the rails console.
I’m trying to connect to my database to explore the way it works.

It’s all fine when I connect and do basic things like

#get Day database

Day.first
Day.last
Day.find('4f272afce096a47ccd000002')

But when I try queries like those:

http://mongoid.org/docs/querying/criteria.html

This is what I get:

Day.where(name: "monday")
 => #<Mongoid::Criteria
  selector: {:name=>"monday"},
  options:  {},
  class:    Day,
  embedded: false>

And that’s when I’m lucky

Answer 1

You’re getting a cursor-like “criteria” back. Criteria are lazily evaluated, so you can chain operations off of them. Try Day.where(name: "monday").first. More specifically,

“All queries in Mongoid are Criteria, which is a chainable and lazily evaluated wrapper to a MongoDB dynamic query. Criteria only touch the database when they need to, for example on iteration of the results, and when executed wrap a cursor in order to keep memory management and performance predictable.” link