title: assigning permissions to groups in django
body: <p>I'm making a bus app and in my models.py i'm having classes customer and company. To customer i want to assign permissions like customer can create account, modify it or delete it and to the company class i want to assign permissions like a company can add a bus detail, delete the bus detail, modify it as well as the permissions assigned to customer. So i'm writing my code like this.</p>
  
  <pre><code>from django.contrib.auth.models import User, Group, Permission
  fom django.contrib.contenttypes.models import ContentType
  
  companyRep = Group(name ='Company Permission')
  companyRep.save()
  customerPerm = Group(name = 'Customer Permission')
  customerPerm.save()
  
  userPerm = ContentType.objects.get(app_label='busapp', model = 'user')
  can_add_bus = Permission(name = 'AddBus', codename = 'can_add_bus', content_type =  'userPerm')
  can_add_bus.save()
  can_delete_bus = Permission(name = 'deleteBus', codename = 'can_delete_bus',  content_type = 'userPerm')
  can_delete_bus.save()
  can_create_profile = Permission(name = 'createProfile', codename =  'can_create_profile', content_type = 'userPerm')
  can_create_profile.save()
  can_delete_profile = Permission(name = 'deleteProfile', codename = 'can_delete_profile', content_type = 'userPerm')
  can_delete_profile.save()
  can_view_profile = Permission(name ='viewProfile', codename = 'can_view_profile', content_type = 'userPerm')
  can_view_profile.save()
  
  companyRep.permissions=[can_view_profile,can_delete_profile,can_create_profile,can_delete_bus, can_add_bus]
  customerPerm.permissions = [can_view_profile,can_delete_profile,can_create_profile]
  
  class Company(models.Model):
      #username associated to authenticate company
          user = models.OneToOneField(User)
      #name of the company
      name = models.CharField(max_length=20)
      #account identifier to carry our transaction handling
          account_number = models.CharField(max_length=10)
      #the phone number of the associated manager
      manager_phone = models.IntegerField()
  
      def __unicode__(self):
          return self.name
      class Customer(models.Model):
      #username associated with the customer
      user = models.OneToOneField(User)
      #first name
      fname = models.CharField(max_length=20)
      #last name
      lname = models.CharField(max_length=20)
      #phone number
      phone_number = models.IntegerField()
      #bank account
      account_number = models.CharField(max_length=10)
      #address
      address = models.TextField()
      #date of birth
      dob = models.DateField()
      #gender
      gender = models.CharField(max_length=6)
  </code></pre>
  
  <p>I'm getting an error IntegrityError: coloumn name is not unique. Can any one please help me with assigning permissions to these groups. am totally new to django</p>