Changing already added documents in mongodb with ruby

Changing already added documents in mongodb with ruby

References

Reference NO 1

http://docs.mongodb.org/manual/tutorial/modify-documents

Reference NO 2

http://docs.mongodb.org/manual/reference/method/db.collection.update

Reference NO 3

http://www.packtpub.com/article/ruby-mongodb-web-developement

Reference NO 4

http://stackoverflow.com/questions/7150552/how-do-i-embed-multiple-documents-in-mongodb-using-ruby-api

Reference NO 5

http://stackoverflow.com/questions/11254565/mongodb-issue-deleting-documents

Reference NO 6

https://devcenter.heroku.com/articles/mongolab

Reference NO 7

http://mongoid.org/en/mongoid/docs/documents.html

Reference NO 8

https://blog.serverdensity.com/does-everyone-hate-mongodb/