old_contents: from django import template
  from isisdata.models import *
  
  register = template.Library()
  
  @register.filter()
  def get_dates(obj):
      attrs = Authority.objects.get(pk=obj['id']).attributes.all()
      if not attrs:
          return None
  
      return [a for a in attrs if a.value and type(a.value.get_child_class()) in [DateTimeValue, DateValue, ISODateValue, ISODateRangeValue]]
  
  @register.filter()
  def get_linkeddata(obj):
      return Authority.objects.get(pk=obj['id']).linkeddata_entries.all()
  
  @register.filter()
  def get_attributes(obj):
      attrs = Authority.objects.get(pk=obj['id']).attributes.all()
      if not attrs:
          return None
  
      return [a for a in attrs if type(a.value.get_child_class()) not in [DateTimeValue, DateValue, ISODateValue, ISODateRangeValue]]
  
  @register.filter()
  def get_acr_count(obj):
      return Authority.objects.get(pk=obj['id']).acrelations.count()
  
new_contents: from django import template
  from isisdata.models import *
  import logging
  
  register = template.Library()
  
  logger = logging.getLogger(__name__)
  
  @register.filter()
  def get_dates(obj):
      attrs = Authority.objects.get(pk=obj['id']).attributes.all()
      if not attrs:
          return None
  
      return [a for a in attrs if _get_attr_value(a)]
  
  def _get_attr_value(attr):
      try:
          return attr if attr.value and type(attr.value.get_child_class()) in [DateTimeValue, DateValue, ISODateValue, ISODateRangeValue] else None
      except Exception, e:
          print e
          return None
  
  @register.filter()
  def get_linkeddata(obj):
      return Authority.objects.get(pk=obj['id']).linkeddata_entries.all()
  
  @register.filter()
  def get_attributes(obj):
      attrs = Authority.objects.get(pk=obj['id']).attributes.all()
      if not attrs:
          return None
  
      return [a for a in attrs if type(a.value.get_child_class()) not in [DateTimeValue, DateValue, ISODateValue, ISODateRangeValue]]
  
  @register.filter()
  def get_acr_count(obj):
      return Authority.objects.get(pk=obj['id']).acrelations.count()
  
subject: fix exception