title: how to add string to primary key in django model
body: <p>i want my id to be &quot;ssid&quot;+ (autoimcrement id)
  example: ssid001</p>
  <blockquote>
  <p>this is my user model</p>
  </blockquote>
  <pre><code>class User(models.Model):
      id = models.AutoField(primary_key=True, editable=False, unique=True, max_length=99999) 
      phone = models.CharField(max_length=12, unique=True,default=&quot;&quot;) 
      name = models.CharField(max_length=50,default=&quot;&quot;)
      email = models.EmailField(max_length=50,default=&quot;&quot;)
  </code></pre>