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from django.db.models import fields
import recurrence
from recurrence import forms
from recurrence.compat import Creator
# Do not use SubfieldBase meta class because is removed in Django 1.10
class RecurrenceField(fields.Field):
"""Field that stores a `recurrence.base.Recurrence` to the database."""
def __init__(self, include_dtstart=True, **kwargs):
self.include_dtstart = include_dtstart
super(RecurrenceField, self).__init__(**kwargs)
def get_internal_type(self):
return 'TextField'
def to_python(self, value):
if value is None or isinstance(value, recurrence.Recurrence):
return value
value = super(RecurrenceField, self).to_python(value) or u''
return recurrence.deserialize(value, self.include_dtstart)
def from_db_value(self, value, *args, **kwargs):
return self.to_python(value)
def get_prep_value(self, value):
if not isinstance(value, str):
value = recurrence.serialize(value)
return value
def contribute_to_class(self, cls, *args, **kwargs):
super(RecurrenceField, self).contribute_to_class(cls, *args, **kwargs)
setattr(cls, self.name, Creator(self))
def value_to_string(self, obj):
return self.get_prep_value(self.value_from_object(obj))
def formfield(self, **kwargs):
defaults = {
'form_class': forms.RecurrenceField,
'widget': forms.RecurrenceWidget,
}
defaults.update(kwargs)
return super().formfield(**defaults)
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