Sql 使用select_related()的Django过滤器
我有一个非常有效的问题:Sql 使用select_related()的Django过滤器,sql,django,django-models,Sql,Django,Django Models,我有一个非常有效的问题: campaignFixtures = UserSelection.objects.select_related().filter(user=currentUserID,campaignno=currentCampaignNo).order_by('fixtureid__fixturedate')[:1] 但是,我需要从另一个表中筛选字段,如下所示: campaignFixtures = UserSelection.objects.select_rela
campaignFixtures = UserSelection.objects.select_related().filter(user=currentUserID,campaignno=currentCampaignNo).order_by('fixtureid__fixturedate')[:1]
但是,我需要从另一个表中筛选字段,如下所示:
campaignFixtures = UserSelection.objects.select_related().filter(user=currentUserID,campaignno=currentCampaignNo,straightredfixture__fixturematchday=18).order_by('fixtureid__fixturedate')[:1]
class StraightredFixture(models.Model):
fixtureid = models.IntegerField(primary_key=True)
home_team = models.ForeignKey('straightred.StraightredTeam', db_column='hometeamid', related_name='home_fixtures')
away_team = models.ForeignKey('straightred.StraightredTeam', db_column='awayteamid', related_name='away_fixtures')
fixturedate = models.DateTimeField(null=True)
fixturestatus = models.CharField(max_length=24,null=True)
fixturematchday = models.ForeignKey('straightred.StraightredFixtureMatchday', db_column='fixturematchday')
spectators = models.IntegerField(null=True)
hometeamscore = models.IntegerField(null=True)
awayteamscore = models.IntegerField(null=True)
homegoaldetails = models.TextField(null=True)
awaygoaldetails = models.TextField(null=True)
hometeamyellowcarddetails = models.TextField(null=True)
awayteamyellowcarddetails = models.TextField(null=True)
hometeamredcarddetails = models.TextField(null=True)
awayteamredcarddetails = models.TextField(null=True)
soccerseason = models.ForeignKey('straightred.StraightredSeason', db_column='soccerseasonid', related_name='fixture_season')
def __unicode__(self):
return self.fixtureid
class Meta:
managed = True
db_table = 'straightred_fixture'
class UserSelection(models.Model):
userselectionid = models.AutoField(primary_key=True)
campaignno = models.CharField(max_length=36,unique=False)
user = models.ForeignKey(User, related_name='selectionUser')
teamselection1or2 = models.PositiveSmallIntegerField()
teamselectionid = models.ForeignKey('straightred.StraightredTeam', db_column='teamselectionid', related_name='teamID')
fixtureid = models.ForeignKey('straightred.StraightredFixture', db_column='fixtureid')
class Meta:
managed = True
db_table = 'straightred_userselection'
但是,我收到以下错误:
Cannot resolve keyword 'straightredfixture' into field. Choices are: campaignno, fixtureid, fixtureid_id, teamselection1or2, teamselectionid, teamselectionid_id, user, user_id, userselectionid
模型如下:
campaignFixtures = UserSelection.objects.select_related().filter(user=currentUserID,campaignno=currentCampaignNo,straightredfixture__fixturematchday=18).order_by('fixtureid__fixturedate')[:1]
class StraightredFixture(models.Model):
fixtureid = models.IntegerField(primary_key=True)
home_team = models.ForeignKey('straightred.StraightredTeam', db_column='hometeamid', related_name='home_fixtures')
away_team = models.ForeignKey('straightred.StraightredTeam', db_column='awayteamid', related_name='away_fixtures')
fixturedate = models.DateTimeField(null=True)
fixturestatus = models.CharField(max_length=24,null=True)
fixturematchday = models.ForeignKey('straightred.StraightredFixtureMatchday', db_column='fixturematchday')
spectators = models.IntegerField(null=True)
hometeamscore = models.IntegerField(null=True)
awayteamscore = models.IntegerField(null=True)
homegoaldetails = models.TextField(null=True)
awaygoaldetails = models.TextField(null=True)
hometeamyellowcarddetails = models.TextField(null=True)
awayteamyellowcarddetails = models.TextField(null=True)
hometeamredcarddetails = models.TextField(null=True)
awayteamredcarddetails = models.TextField(null=True)
soccerseason = models.ForeignKey('straightred.StraightredSeason', db_column='soccerseasonid', related_name='fixture_season')
def __unicode__(self):
return self.fixtureid
class Meta:
managed = True
db_table = 'straightred_fixture'
class UserSelection(models.Model):
userselectionid = models.AutoField(primary_key=True)
campaignno = models.CharField(max_length=36,unique=False)
user = models.ForeignKey(User, related_name='selectionUser')
teamselection1or2 = models.PositiveSmallIntegerField()
teamselectionid = models.ForeignKey('straightred.StraightredTeam', db_column='teamselectionid', related_name='teamID')
fixtureid = models.ForeignKey('straightred.StraightredFixture', db_column='fixtureid')
class Meta:
managed = True
db_table = 'straightred_userselection'
任何帮助都将不胜感激,艾伦。我认为问题与
所选内容无关。您只是试图使用错误的查找值进行筛选。不如改用fixtureid\uu fixturematchday
过滤:
UserSelection.objects.select_related().filter(user=currentUserID, campaignno=currentCampaignNo, fixtureid__fixturematchday=18).order_by('fixtureid__fixturedate')[:1]
既然您只想获取一个对象,为什么不使用获取一个对象而不是一个包含一个项的查询集:
campaignFixture = UserSelection.objects.select_related("fixtureid").filter(...).order_by(...).first()
根据您的模型,关系是fixtureid
UserSelection.objects.select_related().filter(user=currentUserID,campaignno=currentCampaignNo,fixtureid__fixturematchday=18)
非常感谢,我是如此接近。非常感谢您提供的额外信息。确实,这表明您应该更改模型中的字段名。@alantingey-不用担心,您唯一需要类名的时候是通过反向关系查找时,其中没有指定相关名称