Mongoid gives uninitialized constant Mongo

问题

I'm trying to use mongoid but it outputs this error:

uninitialized constant 'Mongo'

Here is my code:

require "mongoid"

Mongoid.configure do |config|
    config.master = Mongo::Connection.new("localhost",27017).db("arthist")
end

class Artist
    include Mongoid::Document
    field :name, type: String
end 

a = Artist.create(name: "hoge")

Do you have any idea?

回答1:

include gem mongo in your Gemfile and restart the server it should do the trick.

来源：https://stackoverflow.com/questions/12188219/mongoid-gives-uninitialized-constant-mongo