old_contents: import os
  from django.db import models
  from core.models import PlCoreBase
  from core.models import Site
  from core.models import DeploymentNetwork
  
  # Create your models here.
  
  class ServiceClass(PlCoreBase):
      name = models.CharField(max_length=32)
      description = models.CharField(max_length=255)
      commitment = models.IntegerField(default=365)
      membershipFee = models.IntegerField(default=0)
      membershipFeeMonths = models.IntegerField(default=12)
      upgradeRequiresApproval = models.BooleanField(default=False)
      upgradeFrom = models.ManyToManyField('self', blank=True, null=True)
  
      def __unicode__(self):  return u'%s' % (self.name)
  
  
new_contents: import os
  from django.db import models
  from core.models import PlCoreBase
  from core.models import Site
  from core.models import DeploymentNetwork
  
  # Create your models here.
  
  class ServiceClass(PlCoreBase):
      name = models.CharField(max_length=32)
      description = models.CharField(max_length=255)
      commitment = models.IntegerField(default=365)
      membershipFee = models.IntegerField(default=0)
      membershipFeeMonths = models.IntegerField(default=12)
      upgradeRequiresApproval = models.BooleanField(default=False)
      upgradeFrom = models.ManyToManyField('self', blank=True, null=True)
  
      class Meta(PlCoreBase.Meta):
         verbose_name_plural = "Service classes"
  
      def __unicode__(self):  return u'%s' % (self.name)
  
  
subject: correct plural spelling of service classes