Django的模型查詢行爲strangly

Question

這是很奇怪的，這個查詢

originator = User.objects.get(Q(emailaddress__email__exact=fromfield) | Q(phonenumber__exact=fromfield)) 

返回兩個對象，當我單獨查詢，然後我得到的只有一個對象。我不明白爲什麼會出現這種情況:(

>>> originator = User.objects.get(emailaddress__email__exact=fromfield) 
Traceback (most recent call last): 
    File "<console>", line 1, in <module> 
    File "/usr/site/gruppe/lib/python2.7/site-packages/django/db/models/manager.py", line 143, in get 
    return self.get_query_set().get(*args, **kwargs) 
    File "/usr/site/gruppe/lib/python2.7/site-packages/django/db/models/query.py", line 401, in get 
    (self.model._meta.object_name, kwargs)) 
DoesNotExist: GruppUser matching query does not exist. Lookup parameters were {'emailaddress__email__exact': 9135261967L} 
>>> originator = User.objects.get(phonenumber__exact=fromfield) 
>>> originator 
<GruppUser: jorge> 
>>> originator = User.objects.get(Q(emailaddress__email__exact=fromfield) | Q(phonenumber__exact=fromfield)) 
Traceback (most recent call last): 
    File "<console>", line 1, in <module> 
    File "/usr/site/gruppe/lib/python2.7/site-packages/django/db/models/manager.py", line 143, in get 
    return self.get_query_set().get(*args, **kwargs) 
    File "/usr/site/gruppe/lib/python2.7/site-packages/django/db/models/query.py", line 405, in get 
    (self.model._meta.object_name, num, kwargs)) 
MultipleObjectsReturned: get() returned more than one GruppUser -- it returned 2! Lookup parameters were {} 

而且這是在原始的查詢集的SQL：

(u'SELECT "gruppu_gruppuser"."password", "gruppu_gruppuser"."last_login", "gruppu_gruppuser"."is_superuser", "gruppu_gruppuser"."id", "gruppu_gruppuser"."username", "gruppu_gruppuser"."first_name", "gruppu_gruppuser"."last_name", "gruppu_gruppuser"."email", "gruppu_gruppuser"."is_staff", "gruppu_gruppuser"."is_active", "gruppu_gruppuser"."date_joined", "gruppu_gruppuser"."phonenumber", "gruppu_gruppuser"."mmsemail", "gruppu_gruppuser"."smsemail", "gruppu_gruppuser"."verified", "gruppu_gruppuser"."realname", "gruppu_gruppuser"."location", "gruppu_gruppuser"."website", "gruppu_gruppuser"."bio", "gruppu_gruppuser"."synctoFB" FROM "gruppu_gruppuser" LEFT OUTER JOIN "account_emailaddress" ON ("gruppu_gruppuser"."id" = "account_emailaddress"."user_id") WHERE ("account_emailaddress"."email" = %s OR "gruppu_gruppuser"."phonenumber" = %s)', (u'9135261967', u'9135261967')) 

的情況下選擇相同的用戶：

>>> queryset.all() 
[<GruppUser: jorge>, <GruppUser: jorge>] 

的SQL真的選擇兩個，這對我來說是黑魔法:(：

        password         |   last_login   | is_superuser | id | username | first_name | last_name |  email  | is_staff | is_active |  date_joined  | phonenumber |   mmsemail   |    smsemail    | verified | realname | location | website | bio | synctoFB 
-------------------------------------------------------------------------------+-------------------------------+--------------+----+----------+------------+-----------+------------------+----------+-----------+------------------------+-------------+--------------------------+------------------------------------+----------+----------+----------+---------+-----+---------- 
xxxx | 2014-02-09 08:49:06.225694+04 | f   | 2 | jorge | Jorge  | Sanchez | x@x.c| f  | t   | 2013-10-08 14:53:16+04 | 9135261967 | 9135261967@xx | 9135261967@xx | t  |   | Prague |   |  | t 
xxxx| 2014-02-09 08:49:06.225694+04 | f   | 2 | jorge | Jorge  | Sanchez | x@x.c | f  | t   | 2013-10-08 14:53:16+04 | 9135261967 | 9135261967@xx | 9135261967@xx | t  |   | Prague |   |  | t 
(2 rows) 

Answer 1

嘗試將.distinct（）添加到查詢的末尾。正如文檔中所述.all（）不會消除重複的行，但.distinct（）會。

這裏的相關文件： https://docs.djangoproject.com/en/dev/ref/models/querysets/#django.db.models.query.QuerySet.distinct