Sinatra, Mongoid, Heroku, MongoHQ: connecting to Mongodb

Question

Trying to get Mongoid up and running with Sinatra on Heroku (MongoHQ). Previous experience with Rails but first time with the stack and Sinatra.

Started with one of the simple examples on the web (app.rb):

require 'rubygems'
require 'sinatra'
require 'mongo'
require 'mongoid'

configure do
  Mongoid.load!('mongoid.yml')

  Mongoid.configure do |config|
    if ENV['MONGOHQ_URL']
      conn = Mongo::Connection.from_uri(ENV['MONGOHQ_URL'])
      uri = URI.parse(ENV['MONGOHQ_URL'])

      # problem happens here 
      config.master = conn.db(uri.path.gsub(/^\//, ''))
    else
      config.master = Mongo::Connection.from_uri("mongodb://localhost:27017").db('test')
    end
  end
end


# Models
class Counter
  include Mongoid::Document

  field :count, :type => Integer

  def self.increment
    c = first || new({:count => 0})
    c.inc(:count, 1)
    c.save
    c.count
  end
end

# Controllers
get '/' do
  "Hello visitor n" + Counter.increment.to_s
end

For reference, mongoid.yml looks like:

development:
  sessions:
    default:
      database: localhost
production:
  sessions:
    default:
      uri: <%= ENV['MONGOHQ_URL'] %>

As per app.rb (# problem happens here), my logs say:

/app/app.rb:15:in `block (2 levels) in <top (required)>': undefined method `master=' for Mongoid::Config:Module (NoMethodError)
    from /app/vendor/bundle/ruby/1.9.1/gems/mongoid-3.0.3/lib/mongoid.rb:112:in `configure'
from /app/app.rb:11:in `block in <top (required)>'
from /app/vendor/bundle/ruby/1.9.1/gems/sinatra-1.3.2/lib/sinatra/base.rb:1273:in `configure'
from /app/app.rb:8:in `<top (required)>'

I have also tried variants, including:

config.master = Mongo::Connection.from_uri(ENV['MONGOHQ_URL']).db('appXXXXX')
Mongoid.database = Mongo::Connection.from_uri(ENV['MONGOHQ_URL']).db('appXXXXXXX')

But get the same error:

undefined method `master` for Mongoid::Config:Module (NoMethodError)

or:

undefined method `database=` for Mongoid::Config:Module (NoMethodError)

What am I missing?

iltempo · Accepted Answer · 2012-08-05 12:56:14Z

3

Shouldn't be

configure do
  Mongoid.load!('mongoid.yml')
end

enough?

That's what the mongid docs are saying. The MONGOHQ_URL environment variable already contains every information to initialize the connection to the db.

answered Aug 5, 2012 at 12:56

iltempo

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1 Comment

Daniel May Over a year ago

Thanks @iltempo :) I figured out the problem, just writing up the answer.

Daniel May · Accepted Answer · 2012-08-05 23:09:03Z

3

So was using Mongoid 3.x ... which:

Doesn't use 10gen driver: uses Moped
Doesn't use config.master

The canonical sample code above which is all over the web works out of the box with Mongoid 2.x so have dropped back to that for the time being.

Thanks!

answered Aug 5, 2012 at 23:09

Daniel May

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