mirror of
https://github.com/netbox-community/netbox.git
synced 2024-05-10 07:54:54 +00:00
35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
from __future__ import unicode_literals
|
|
|
|
from django.db import connections, models
|
|
from django.db.models.sql.compiler import SQLCompiler
|
|
|
|
|
|
class NullsFirstSQLCompiler(SQLCompiler):
|
|
|
|
def get_order_by(self):
|
|
result = super(NullsFirstSQLCompiler, self).get_order_by()
|
|
if result:
|
|
return [(expr, (sql + ' NULLS FIRST', params, is_ref)) for (expr, (sql, params, is_ref)) in result]
|
|
return result
|
|
|
|
|
|
class NullsFirstQuery(models.sql.query.Query):
|
|
|
|
def get_compiler(self, using=None, connection=None):
|
|
if using is None and connection is None:
|
|
raise ValueError("Need either using or connection")
|
|
if using:
|
|
connection = connections[using]
|
|
return NullsFirstSQLCompiler(self, connection, using)
|
|
|
|
|
|
class NullsFirstQuerySet(models.QuerySet):
|
|
"""
|
|
Override PostgreSQL's default behavior of ordering NULLs last. This is needed e.g. to order Prefixes in the global
|
|
table before those assigned to a VRF.
|
|
"""
|
|
|
|
def __init__(self, model=None, query=None, using=None, hints=None):
|
|
super(NullsFirstQuerySet, self).__init__(model, query, using, hints)
|
|
self.query = query or NullsFirstQuery(self.model)
|