74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
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# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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from django.db.models.query import QuerySet
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from django.db.models.sql import Query
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from django.db.models.sql.compiler import SQLCompiler
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from django.db import connections
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'''
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models.py:
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-----------------------------------
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from ox.django.query import QuerySet
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class Manager(models.Manager):
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def get_query_set(self):
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return QuerySet(self.model)
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class Model(models.Model):
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...
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objects = Manager()
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'''
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class SQLCompiler(SQLCompiler):
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def get_ordering(self):
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result, group_by = super(SQLCompiler, self).get_ordering()
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if self.query.nulls_last and len(result):
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if self.connection.vendor == 'sqlite':
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_result = []
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for r in result:
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if r.endswith(' DESC'):
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_r = r[:-len(' DESC')]
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elif r.endswith(' ASC'):
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_r = r[:-len(' ASC')]
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_result.append(_r + ' IS NULL')
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_result.append(r)
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result = _result
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else:
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result = map(lambda e: e + ' NULLS LAST', result)
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return result, group_by
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class Query(Query):
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nulls_last = False
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def clone(self, *args, **kwargs):
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obj = super(Query, self).clone(*args, **kwargs)
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obj.nulls_last = self.nulls_last
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return obj
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def get_compiler(self, using=None, connection=None):
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if using is None and connection is None:
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raise ValueError("Need either using or connection")
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if using:
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connection = connections[using]
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# Check that the compiler will be able to execute the query
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for alias, aggregate in self.aggregate_select.items():
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connection.ops.check_aggregate_support(aggregate)
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return SQLCompiler(self, connection, using)
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class QuerySet(QuerySet):
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def __init__(self, model=None, query=None, using=None):
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super(QuerySet, self).__init__(model=model, query=query, using=None)
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self.query = query or Query(self.model)
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def order_by(self, *args, **kwargs):
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nulls_last = kwargs.pop('nulls_last', False)
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obj = super(QuerySet, self).order_by(*args, **kwargs)
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obj.query.nulls_last = nulls_last
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return obj
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