Skip to main content

What is attr_accessor in Rails?

What is attr_accessor in Rails?

attr_accessor is used to define an attribute for object of Model which is not mapped with any column in database. This answers question - What is attr_accessor in Rails.
1. attr_accessor Methods

attr_accessor creates two methods i.e. getter method and setter method.
getter method - it is used to retrieve value of the attribute
setter method - it is used to set value to the attribute
When to use attr_accessor in Rails?

Whenever you want to show certain attribute for particular form but you do not want to store it's value in the database then you use attr_accessor for that model as follows,
Suppose we have a Model called user in out database with following fields,


And we define attr_accessor :type_of_user as follows,

Class User < ActiveRecord::Base
   attr_accessor :type_of_user

Now, whenever you create a object of the class User then you can assign a value to it's attr_accessor.

new_user = => 'Albert', :age => 23, :city => 'Ports S.')

This will create new object of class User and assign given attribute values. You can assign value to attr_accessor variable as follows,

new_user.type_of_user = 'middle-aged'

This assigns 'middle-aged' value to the attribute type_of_user attr_accessor.
getter and setter in Action

For attribute type_of_user getter and setter methods are created as follows,

# getter
def type_of_user

# setter
def type_of_user=(val)
  @type_of_user = val

And these are used whenever we assign or retrieve values from the attr_accessor.
2. Lifetime of attr_accessor

attr_accessor is accessible throughout object's lifecycle. When object is saved using any of ActiveRecord method, save, update etc. all attributes of Model other than attr_accessor are saved in the database.
How to Access

Throughout lifecycle of object, you can access the value of attribute accessor as follows,


and can be used for any operation as you do with normal attribute value.


Popular posts from this blog

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).?

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails?

1)change the gemfile in mysql version
 gem 'mysql2'

2)Change to mysql2 version
 gem 'mysql2','0.3.20'

Get user accessing ip address in rails?

Get user accessing ip address rails?

request.ip ->returns the ip, whether is is a local proxy ip (localhost address) or not.
*request.remote_ip -> is smarter and gets the ip address of the client outside of local proxies.
3)If you are using apache in front of a mongrel, then remote_ip will return the source address of the request, which in this case will be local host because the Apache web server is making the request, so instead put this in your controller:

@remote_ip = request.env["HTTP_X_FORWARDED_FOR"]

PayUMoney Integration in Ruby on Rails

PayUMoney Integration in Ruby on Rails

Generating Cheksum in Payu
   Hash or Checksum
= sha512(key|txnid|amount|productinfo|firstname|email|u

Controller Code Will be
def payumoney
  @key = "gtKFFx"
  @salt =  "eCwWELxi"
  val = "#{key|txnid|amount|productinfo|firstname|email|u
 @checksum = Digest::SHA512.hexdigest("#{val}")

<form action="" method='post' id='sub'  >
    <input type="hidden" name="key" value="<%=@key%>">
    <input type="hidden" name="hash" value="<%=@checksum%>">
    <input type="hidden" name="txnid" value="TXN1234">
    <input type="hidden" name="amount" value="200">
    <input type="hidden" name="firstname" value=&quo…