new_contents: from core.models import *
  
  def handle(slice):
  	site_deployments = SiteDeployments.objects.all()
  	site_deploy_lookup = defaultdict(list)
  	for site_deployment in site_deployments:
  		site_deploy_lookup[site_deployment.site].append(site_deployment.deployment)
  	
  	slice_deployments = SliceDeployments.objects.all()
  	slice_deploy_lookup = defaultdict(list)
  	for slice_deployment in slice_deployments:
  		slice_deploy_lookup[slice_deployment.slice].append(slice_deployment.deployment)
  	
  	all_deployments = Deployment.objects.all() 
  	# slices are added to all deployments for now
  	expected_deployments = all_deployments
  	#expected_deployments = site_deploy_lookup[slice.site]
  	for expected_deployment in expected_deployments:
  		if slice not in slice_deploy_lookup or \
  		   expected_deployment not in slice_deploy_lookup[slice]:
  			sd = SliceDeployments(slice=slice, deployment=expected_deployment)
  			sd.save()
  
  
subject: Add new slices to all deployments