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我是Django的新手，正在努力弄清楚如何查询数据库，然后返回一个基于下拉选择的过滤列表。我已经尝试过使用表单，但我不确定这是否有必要，因为我不需要存储下拉数据-我只想用它来查询数据库并进行相应的过滤。因此，如果用户在“类型”下拉列表中选择" Dog“，我将查询Dog数据库，然后根据第二个下拉选择"age_group”对其进行过滤。因此，如果用户选择"dog“，然后选择"baby”，它将返回一个小狗列表。dog.model class Dog(models.Model):
name =models.CharField(max_length=200,validators=[MinLengthValidator(2, "Nickname must
be greater than 1 character")])
breed_group = models.CharField(max_length=200, choices=BreedGroup.choices, null=False,
blank=False, default='Not Enough Information')
breeds = models.ForeignKey(DogBreed, on_delete=models.PROTECT)
age = models.PositiveIntegerField()
ageGroup = models.IntegerField(choices=AgeGroup.choices, null=False, blank=False,
default=0)
sex = models.IntegerField(choices=SEX, blank=False, null=False, default=0)
tagLine = models.CharField(max_length=150)
goodWithCats = models.BooleanField(blank=False, null=False, default='Not Enough
Information')
goodWithDogs = models.BooleanField(null=False, blank=False, default='Not Enough
Information')
goodWKids = models.BooleanField(null=False, blank=False, default='Not Enough
Information')
def __str__(self):
return self.namesearch.html
TYPE
ALL TYPES # queries all
CAT # queries class CAT
DOG # queries class Dog
OTHER # queries class Other
AGE
ANY AGE # returns all listings
BABY # returns babies of selected
type
ADULT #'' adults ''
SENIOR#'' seniors ''
SEARCH
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