Add support for prefetching fields
This makes it possible to specify the fields that should be
prefetched as part of a getForFields query. Doing a prefetch on a
ReferenceProperty when it is known that the property will be
referenced in (almost all) entities is far more efficient than
doing the invididual fetches sequentially.
from django.core.management.base import NoArgsCommand, CommandError
class Command(NoArgsCommand):
help = "Runs the command-line client for the current DATABASE_ENGINE."
requires_model_validation = False
def handle_noargs(self, **options):
from django.db import connection
try:
connection.client.runshell()
except OSError:
# Note that we're assuming OSError means that the client program
# isn't installed. There's a possibility OSError would be raised
# for some other reason, in which case this error message would be
# inaccurate. Still, this message catches the common case.
raise CommandError('You appear not to have the %r program installed or on your path.' % \
connection.client.executable_name)