Ruby and Rails have many magic features like blocks/closures, duck typing/mix-ins/modules, method_missing, poetry mode.
One of the common tasks in programming web applications on Rails is finding a row in a table by several columns and creating a new row in case of row is missing.
Ruby is a dynamic language, that’s why you won’t get compile time type warnings/errors as you get in languages like C#.
Ruby has a lot of metaprogramming features allowing you to create your own custom methods on the fly which can be used the same as att_accessor.
sometimes in after_save callback it is needed to determine if a record was created or updated without the use of after_create callback.
The post describes what mean ‘attr_accessor’ and ‘attr_accessible’ in a Rails Model.
Ruby uses Perl-compatible regular expressions, so if you’re familiar with the preg_*functions in PHP, it will be easy to learn regular expressions in Ruby.