old_contents: import os
  from django.db import models
  from core.models import PlCoreBase
  from core.models import User,Site,Slice,Controller
  from core.models.plcorebase import StrippedCharField
  from encrypted_fields import EncryptedCharField
  from core.models import Controller,ControllerLinkManager,ControllerLinkDeletionManager
  
  class UserCredential(PlCoreBase):
      user = models.ForeignKey(User, related_name='usercredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = StrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class SiteCredential(PlCoreBase):
      site = models.ForeignKey(Site, related_name='sitecredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = SrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class SliceCredential(PlCoreBase):
      slice = models.ForeignKey(Slice, related_name='slicecredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = StrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class ControllerCredential(PlCoreBase):
      objects = ControllerLinkManager()
      deleted_objects = ControllerLinkDeletionManager()
      controller = models.ForeignKey(Controller, related_name='controllercredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = models.CharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
new_contents: import os
  from django.db import models
  from core.models import PlCoreBase
  from core.models import User,Site,Slice,Controller
  from core.models.plcorebase import StrippedCharField
  from encrypted_fields import EncryptedCharField
  from core.models import Controller,ControllerLinkManager,ControllerLinkDeletionManager
  
  class UserCredential(PlCoreBase):
      user = models.ForeignKey(User, related_name='usercredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = StrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class SiteCredential(PlCoreBase):
      site = models.ForeignKey(Site, related_name='sitecredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = StrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class SliceCredential(PlCoreBase):
      slice = models.ForeignKey(Slice, related_name='slicecredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = StrippedCharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
  class ControllerCredential(PlCoreBase):
      objects = ControllerLinkManager()
      deleted_objects = ControllerLinkDeletionManager()
      controller = models.ForeignKey(Controller, related_name='controllercredentials', help_text="The User this credential is associated with")
  
      name = models.SlugField(help_text="The credential type, e.g. ec2", max_length=128)
      key_id = models.CharField(help_text="The backend id of this credential", max_length=1024)
      enc_value = EncryptedCharField(help_text="The key value of this credential", max_length=1024)
  
  
      def __unicode__(self):
          return self.name
  
subject: fix typo