1
所以我想做一個查詢，其中一個字段等於for循環中的對象的屬性。這裏是工作示例/例子使用的SQLAlchemy：Python Django - 模型：for循環查詢/過濾器
you = session.query(Users).filter_by(id=login_session['userid']).first()
friends = session.query(Friends).filter_by(user_id=you.id).all()
dashboard = session.query(Markers).filter(Markers.owner.in_([f.friend_id for f in friends)]).all()
我怎麼會做在Django？
這裏是我的嘗試：
you = Accounts.objects.get(uname = request.session['username'])
following = Follows.objects.filter(userid=you.id)
POSTS = Posts.objects.filter(ownerid = [f.follow_id for f in following])
，這就是我得到：
Traceback:
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\core\handlers\base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\core\handlers\base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\utils\decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "C:\Users\waite-ryan-m\Desktop\epsity\webapp\views.py" in profileMain
102. POSTS = Posts.objects.filter(ownerid = [f.follow_id for f in following])
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\manager.py" in manager_method
122. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\query.py" in filter
790. return self._filter_or_exclude(False, *args, **kwargs)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\query.py" in _filter_or_exclude
808. clone.query.add_q(Q(*args, **kwargs))
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\sql\query.py" in add_q
1243. clause, _ = self._add_q(q_object, self.used_aliases)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\sql\query.py" in _add_q
1269. allow_joins=allow_joins, split_subq=split_subq,
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\sql\query.py" in build_filter
1203. condition = self.build_lookup(lookups, col, value)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\sql\query.py" in build_lookup
1099. return final_lookup(lhs, rhs)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\lookups.py" in __init__
19. self.rhs = self.get_prep_lookup()
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\lookups.py" in get_prep_lookup
57. return self.lhs.output_field.get_prep_lookup(self.lookup_name, self.rhs)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_lookup
1860. return super(IntegerField, self).get_prep_lookup(lookup_type, value)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_lookup
744. return self.get_prep_value(value)
File "C:\Users\waite-ryan-m\Desktop\WPython\WinPython-64bit-2.7.12.1Zero\python-2.7.12.amd64\lib\site-packages\django\db\models\fields\__init__.py" in get_prep_value
1854. return int(value)
Exception Type: TypeError at /main/
Exception Value: int() argument must be a string or a number, not 'list'
我的模型：
class Accounts(models.Model):
uname = models.CharField(max_length = 20, default = '')
displayname = models.CharField(max_length = 30, default = '')
email = models.CharField(max_length = 50, default = '')
pswrd = models.CharField(max_length = 50, default = '')
provider = models.CharField(max_length = 20, default = '')
provider_id = models.CharField(max_length = 100, default = '')
avi = models.CharField(max_length = 500, default = '/static/img/anon2.png')
background = models.CharField(max_length = 500, default = '/static/img/bg-default.jpg')
gender = models.CharField(max_length = 25, default = '')
phone = models.CharField(max_length = 25, default = '')
type = models.CharField(max_length = 20, default = '')
status = models.CharField(max_length = 9, default = 'public')
# status: either public, private or deleted
official = models.IntegerField(default = 0)
# official: 1 = True | 0 = False
interests = models.CharField(max_length = 1725, default = '')
seeking = models.CharField(max_length = 1725, default = '')
bio_desc = models.CharField(max_length = 150, default = '')
bio_link = models.CharField(max_length = 150, default = '')
#bio_link_name = models.CharField(max_length = 100, default = '')
date_created = models.DateField(default = datetime.datetime.now)
last_active = models.DateField(auto_now=True)
@property
def serialize(self):
# Returns Data Object In Proper Format
return {
'userid': self.id,
'uname': self.uname,
'displayname': self.displayname,
'avi': self.avi,
'status': self.status,
'background': self.background,
}
@property
def get_bio(self):
# Returns Data Object In Proper Format
return {
'desc': self.bio_desc,
'link': self.bio_link,
#'linkName': self.bio_link_name,
}
@property
def get_info(self):
# Returns Data Object In Proper Format
return {
'interests': self.interests,
'seeking': self.seeking,
#'linkName': self.bio_link_name,
}
class Meta:
db_table = "accounts"
# --- #
class Follows(models.Model):
userid = models.IntegerField(blank = False, default = 0)
user_rel = models.ForeignKey(Accounts, default = 0, related_name = "user_rel")
follow_id = models.IntegerField(blank = False, default = 0)
follow_rel = models.ForeignKey(Accounts, default = 0, related_name = "follow_rel")
date_created = models.DateField(default = datetime.datetime.now)
@property
def serialize(self):
# Returns Data Object In Proper Format
return {
'fid': self.id,
'userid': self.userid,
'user': self.user_rel.serialize,
'followid': self.follow_id,
'follow': self.follow_rel.serialize,
'date_created': self.date_created
#'linkName': self.bio_link_name,
}
class Meta:
db_table = "follows"
# ---
class Posts(models.Model):
OwnerType = (
('Account', 'Account'),
('Group', 'Group'),
)
PostTypes = (
('Text', 'Text'),
('Photo', 'Photo'),
('Audio', 'Audio'),
('Video', 'Video'),
)
ownerid = models.IntegerField(blank = False, default = 0)
owner_type = models.CharField(choices = OwnerType, blank = False, default = '', max_length = 50)
title = models.CharField(max_length = 500, default = '')
contents = models.CharField(max_length = 500, default = '')
link = models.CharField(max_length = 500, default = '')
attachment = models.CharField(max_length = 500, default = '')
attachment_type = models.CharField(max_length = 500, default = '')
post_type = models.CharField(max_length = 20, choices = PostTypes, default = '')
status = models.CharField(max_length = 20, default = 'public') # either public, private, or deleted
date_created = models.DateField(default = datetime.datetime.now)
last_active = models.DateField(auto_now=True)
@property
def serialize(self):
return {
'p_id': self.id,
'ownerid': self.ownerid,
'owner': returnModelSerialized(self.owner_type , self.ownerid),
'owner_type': self.owner_type,
'title': self.title,
'contents': self.contents,
'attachment': self.attachment,
'attachment_type': self.attachment_type,
'link': self.link,
'post_type': self.post_type,
'status': self.status,
'date_created': self.date_created,
'last_active': self.last_active
}
class Meta:
db_table = "posts"
# ---
你= Accounts.objects.get（UNAME =的request.session [ '用戶名']） 下列= Follows.objects.filter（用戶id = you.id） 帖= Posts.objects.filter（ ownerid = [f.follow_id for f in]] – ryanwaite28
在評論中很難閱讀代碼。更新問題以包含代碼。也告訴我們代碼做了什麼，以及如何與你想要的不同。 –
當然！增加了模型 – ryanwaite28