def get_prepared_db_value(connection, instance, field, raw=False):
value = (
getattr(instance, field.attname)
if raw else field.pre_save(instance, instance._state.adding)
)
# If value is None, but there is a default, and the field is
# not nullable then we should populate it
# Otherwise thing get hairy when you add new fields to models
if value is None and field.has_default() and not field.null:
value = field.get_default()
if isinstance(value, BaseExpression):
from djangae.db.backends.appengine.expressions import evaluate_expression
# We can't actually support F expressions on the datastore, but we can simulate
# them, evaluating the expression in place.
# TODO: For saves and updates we should raise a Warning. When evaluated in a filter
# we should raise an Error
value = evaluate_expression(value, instance, connection)
if hasattr(value, "prepare_database_save"):
value = value.prepare_database_save(field)
else:
value = field.get_db_prep_save(
value,
connection=connection
)
value = connection.ops.value_for_db(value, field)
return value
def get_prepared_db_value(connection, instance, field, raw=False):
value = getattr(instance, field.attname) if raw else field.pre_save(instance, instance._state.adding)
if isinstance(value, BaseExpression):
from djangae.db.backends.appengine.expressions import evaluate_expression
# We can't actually support F expressions on the datastore, but we can simulate
# them, evaluating the expression in place.
# TODO: For saves and updates we should raise a Warning. When evaluated in a filter
# we should raise an Error
value = evaluate_expression(value, instance, connection)
if hasattr(value, "prepare_database_save"):
value = value.prepare_database_save(field)
else:
value = field.get_db_prep_save(value, connection=connection)
value = connection.ops.value_for_db(value, field)
return value
def get_prepared_db_value(connection, instance, field, raw=False):
value = getattr(instance, field.attname) if raw else field.pre_save(
instance, instance._state.adding)
if isinstance(value, BaseExpression):
from djangae.db.backends.appengine.expressions import evaluate_expression
# We can't actually support F expressions on the datastore, but we can simulate
# them, evaluating the expression in place.
#TODO: For saves and updates we should raise a Warning. When evaluated in a filter
# we should raise an Error
value = evaluate_expression(value, instance, connection)
if hasattr(value, "prepare_database_save"):
value = value.prepare_database_save(field)
else:
value = field.get_db_prep_save(value, connection=connection)
value = connection.ops.value_for_db(value, field)
return value