old_contents: import logging
  
  from django import forms
  
  from readthedocs.builds.models import VersionAlias, Version
  from readthedocs.core.utils import trigger_build
  from readthedocs.projects.models import Project
  from readthedocs.projects.tasks import clear_artifacts
  
  
  log = logging.getLogger(__name__)
  
  
  class AliasForm(forms.ModelForm):
  
      class Meta:
          model = VersionAlias
          fields = (
              'project',
              'from_slug',
              'to_slug',
              'largest',
          )
  
      def __init__(self, instance=None, *args, **kwargs):
          super(AliasForm, self).__init__(instance=instance, *args, **kwargs)
          if instance:
              self.fields['project'].queryset = (Project.objects
                                                 .filter(pk=instance.project.pk))
  
  
  class VersionForm(forms.ModelForm):
  
      class Meta:
          model = Version
          fields = ['active', 'privacy_level', 'tags']
  
      def save(self, *args, **kwargs):
          obj = super(VersionForm, self).save(*args, **kwargs)
          if obj.active and not obj.built and not obj.uploaded:
              trigger_build(project=obj.project, version=obj)
  
new_contents: from django import forms
  
  from readthedocs.builds.models import VersionAlias, Version
  from readthedocs.projects.models import Project
  from readthedocs.core.utils import trigger_build
  
  
  class AliasForm(forms.ModelForm):
  
      class Meta:
          model = VersionAlias
          fields = (
              'project',
              'from_slug',
              'to_slug',
              'largest',
          )
  
      def __init__(self, instance=None, *args, **kwargs):
          super(AliasForm, self).__init__(instance=instance, *args, **kwargs)
          if instance:
              self.fields['project'].queryset = (Project.objects
                                                 .filter(pk=instance.project.pk))
  
  
  class VersionForm(forms.ModelForm):
  
      class Meta:
          model = Version
          fields = ['active', 'privacy_level', 'tags']
  
      def save(self, *args, **kwargs):
          obj = super(VersionForm, self).save(*args, **kwargs)
          if obj.active and not obj.built and not obj.uploaded:
              trigger_build(project=obj.project, version=obj)
  
subject: Clean up unused imports