Read, Write and Upsert in mongoid, run: RACK_ENV=development ruby doc.rb

doc.rb

require 'mongoid'
Mongoid.load!("./mongoid.yml")
Mongoid.raise_not_found_error = false

class Doc
  include Mongoid::Document
  store_in collection: "testing123"
  field :name, type: Integer
  field :_id, type: Integer, default: ->{ name }

  field :somehash, :type => Hash
end

$counter = 0
def printme
  entry = Doc.collection.find({:name => 123}).first
  p "Found Elem #{$counter = $counter+1}: #{entry.inspect}"
  p "Found Hash #{$counter}: #{entry.fetch("somehash", :NoFound)}"
end

#1- Find or Modufy first hash
Doc.collection.find({:name => 123}).remove
a = Doc.find_and_modify({:_id => 123, :name => 123, :somehash => {c: 1} },{upsert: true, new: true})
printme

#2- Create the first entry in the internal hash
a = Doc.collection.find({:name => 123})
a.upsert("$set" => {"somehash.b" => 1})
printme

#3- Update the first entry in the internal hash
a = Doc.collection.find({:name => 123})
a.upsert("$set" => {"somehash.b" => 2})
printme

#4- Add a second entry to somehash
a = Doc.collection.find({:name => 123})
a.upsert("$set" => {"somehash.c" => 1})
printme

mongoid.yml

development:
  sessions:
    default:
      database: mongoid_dev
      hosts:
        - localhost:27017