ActionController::ParamsWrapper in Rails is responsible for wrapping the parameters hash into a nested hash.

ActiveRecord comes with a mechanism to track changes to your model with ActiveModel::Dirty. Lets put it to some use.

Observer pattern provides a simple mechanism for one object to inform a set of interested objects when its state changes.

All migration files in Rails are by default prefixed with the timestamp which serves as the version number for the migration file. For an instance a migration file with name 20160310141700_create_users.rb is prefixed with timestamp 20160310141700.

This is in continuation with the ArrayInquirer post. Lets see how to implement a Custom Inquirer for a Rails model similar to ActiveSupport StringInquirer and ArrayInquirer.

Rails 5 introduced ArrayInquirer as a new member to Inquirer family which initially consisted of well known StringInquirer.

In my previous post, I have explained how to extend ActiveRecord::Base. In this post, I will explain how to extend core ruby or rails classes in rails.

Very often, I have come accross the situation where I need ruby variables in javascript file. Recently, I got to know about a wonderful gem gon which does the work for you. Lets see with an example.

Database is considered an expensive resource, and while developing our application we should be particular about the number of DB queries made, in general fewer the DB queries executed, the better the performance.

In this post, lets see how to extend ActiveRecord::Base class to add custom methods.