Django表单查询集:不包括现有记录
在Django,我有以下模型:一个是分店,另一个是基本水果,另一个是每个分店出售的水果:Django表单查询集:不包括现有记录,django,forms,django-queryset,Django,Forms,Django Queryset,在Django,我有以下模型:一个是分店,另一个是基本水果,另一个是每个分店出售的水果: from django.db.models import Q class Branch(models.Model): name = models.CharField(...) ... class Fruit(models.Model): name = models.CharField() ... class BranchFruit(models.Model):
from django.db.models import Q
class Branch(models.Model):
name = models.CharField(...)
...
class Fruit(models.Model):
name = models.CharField()
...
class BranchFruit(models.Model):
branch = models.ForeignKey(Branch)
fruit = models.ForeignKey(Fruit)
...
class Meta:
unique_together = ('branch', 'fruit')
提供了一个用于添加新水果的表单,查询集应排除该商店中已有的水果。我正在考虑使用以下方法:
表格:
views.py包含:
if request.method=='GET':
branch = request.user.branch # The branch shop the user belongs to
return render(request, template, {'branchFruitForm':BranchFruitForm(branch)})
但是BranchRuitForm在excludes
语句中失败,并显示以下消息:
int() argument must be a string or a number, not 'Branch'
如何修复它?我认为它需要的是ID而不是对象。尝试构建一个ID列表并将其传入。在此行中 excludes=BranchFruit.objects.filter(branch=args) 试试这个
excludes=BranchFruit.objects.filter(branch\u id\u in=[args])我最终得到了以下解决方案:
def __init__(self, branch, *args, **kwargs):
super(BranchFruitForm, self).__init__(*args, **kwargs)
branchFruits = BranchFruit.objects.filter(branch_id=branch.id)
excludes = [fruit.fruit.id for fruit in branchFruits]
self.fields['fruit'].queryset = Fruit.objects.all().exclude(id__in=excludes)
非常感谢,伙计们。此外,您可以简单地执行self.fileds[“fruits”].queryset=Fruit.objects。all().exclude(id_uuin,*listofids)
def __init__(self, branch, *args, **kwargs):
super(BranchFruitForm, self).__init__(*args, **kwargs)
branchFruits = BranchFruit.objects.filter(branch_id=branch.id)
excludes = [fruit.fruit.id for fruit in branchFruits]
self.fields['fruit'].queryset = Fruit.objects.all().exclude(id__in=excludes)