google.appengine.ext.db.DateProperty

A date property, which stores a date without a time.

Inherits From: DateTimeProperty, Property, expected_type

google.appengine.ext.db.DateProperty(
    verbose_name=None, auto_now=False, auto_now_add=False, **kwds
)

verbose_name Verbose name is always first parameter.
auto_now Date/time property is updated with the current time every time it is saved to the datastore. Useful for properties that want to track the modification time of an instance.
auto_now_add Date/time is set to the when its instance is created. Useful for properties that record the creation time of an entity.

Child Classes

class data_type

Methods

datastore_type

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datastore_type()

Deprecated backwards-compatible accessor method for self.data_type.

default_value

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default_value()

Default value for datetime.

Returns
value of now() as appropriate to the date-time instance if auto_now or auto_now_add is set, else user configured default value implementation.

empty

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empty(
    value
)

Determine if value is empty in the context of this property.

For most kinds, this is equivalent to "not value", but for kinds like bool, the test is more subtle, so subclasses can override this method if necessary.

Args
value Value to validate against this Property.

Returns
True if this value is considered empty in the context of this Property type, otherwise False.

get_updated_value_for_datastore

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get_updated_value_for_datastore(
    model_instance
)

Get new value for property to send to datastore.

Returns
now() as appropriate to the date instance in the odd case where auto_now is set to True, else AUTO_UPDATE_UNCHANGED.

get_value_for_datastore

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get_value_for_datastore(
    model_instance
)

Get value from property to send to datastore.

We retrieve a datetime.date from the model instance and return a datetime.datetime instance with the time set to zero.

See base class method documentation for details.

make_value_from_datastore

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make_value_from_datastore(
    value
)

Native representation of this property.

We receive a datetime.datetime retrieved from the entity and return a datetime.date instance representing its date portion.

See base class method documentation for details.

make_value_from_datastore_index_value

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make_value_from_datastore_index_value(
    index_value
)

now

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@staticmethod
now()

Get now as a date datetime value.

Returns
'date' part of 'now' only.

validate

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validate(
    value
)

Validate date.

Returns
A valid value.

Raises
BadValueError if property is not instance of 'date', or if it is an instance of 'datetime' (which is a subclass of 'date', but for all practical purposes a different type).

creation_counter 2