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PORails -- self vs. @
 

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    <p>I am following Michael Hartl's RoR tutorial, and it is covering the basics of password encryption. This is the User model as it currently stands:</p> <pre><code>class User &lt; ActiveRecord::Base attr_accessor :password attr_accessible :name, :email,: password, :password_confirmation email_regex = /^[A-Za-z0-9._+-]+@[A-Za-z0-9._-]+\.[A-Za-z0-9._-]+[A-Za-z]$/ #tests for valid email addresses. validates :name, :presence =&gt; true, :length =&gt; {:maximum =&gt; 50} validates :email, :presence =&gt; true, :format =&gt; {:with =&gt; email_regex}, :uniqueness =&gt; {:case_sensitive =&gt; false} validates :password, :presence =&gt; true, :length =&gt; {:maximum =&gt; 20, :minimum =&gt; 6}, :confirmation =&gt; true before_save :encrypt_password private def encrypt_password self.encrypted_password = encrypt(password) end def encrypt(string) string end end </code></pre> <p>I posted a previous question about <code>before_save</code> not working, and it turns out that what I had accidentally done is written my encrypt_password as:</p> <pre><code>def encrypt_password @encrypted_password = encrypt(password) end </code></pre> <p>I understand that if self.encrypted_password sets the encrypted_password attribute, but why does @encrypted_password not do that as well? In the response to the previous post about <code>before_save</code> not working someone said that the instance variable was "forgotten" after the method ended with the way I had originally coded it -- why was this the case? Can someone please explain how self and @ work differently <strong>in the context of the code above?</strong></p> <p>NOTE: I already took a look at the posts <a href="https://stackoverflow.com/questions/1693243/instance-variable-self-vs">here</a> and <a href="https://stackoverflow.com/questions/4639271/ruby-self-vs">here</a>, but they both say that "self" is calling the <code>attribute =</code> method, and I don't even understand how that method could exist here since I never created it or declared the encrypted_password w/ <code>attr_accessor</code>. So I am still confused, and <strong>this is not a re-posting of those questions.</strong></p>
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    1. CORelated: [Ruby: self vs @](http://stackoverflow.com/questions/4639271/ruby-self-vs)
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