Question

I have to read an existing mongo database. Is mongoid suitable for this?

All the tutorials I found were about building a mongo database from scratch.

I have tried accessing the database using mongoid, and have no luck displaying existing information, this is what I tried.

mongoid.yml:

development:
  host: localhost
  database: managementdb

test:
  host: localhost
  database: managementdb

I did a scaffold (I don’t like how mongoid takes over scaffolding)

the model:

class GamerProfile
  include Mongoid::Document
  store_in :profile

  field :facebookId, :type => String
  field :playerName, :type => String
  field :locale, :type => String
  field :dateJoined, :type => Time
end

But the existing information in localhost:27017/managementdb/Profile isn’t displaying in the view.

I only need readonly access. Would mongomapper or mongomodel be more suited?

Answer 1

I’ve tried mongomapper after having tried mongoid, and it does exactly what it’s name implies.

Let say I have a collection called User in mongodb which relates to a user in a game but doesn’t necessarily relate to the User model for that application then I use set_collection_name "User" in a model called GameUser for example.

My initialiser is lifted straight from the mongodb docs; which use mongomapper for their example.

MongoMapper.connection = Mongo::Connection.new('localhost', 27017)
MongoMapper.database = "gamedb"

And my model looks like this:

class GameUser
  include MongoMapper::Document

  set_collection_name "User"
  key :playerName, :type => String
  ...
  key :dateJoined, :type => Time
end

And now my scaffold loads to data from the GameUser perfectly.