Python 当某些参数为空时，django筛选器

我现在使用django过滤器获取我想要的查询集，下面是我的代码：

             students = Student.objects.filter(
                sales=current_user,
                nickname = form_data['nickname'],
                mobile = form_data['mobile'],
                gender = form_data['gender'],
                state = form_data['state'],
                source = form_data['source'],
                register_at = form_data['register_at'],
                importance = form_data['importance'],
                remaining = form_data['remaining'],
                level = form_data['level'],
                feature = form_data['feature'],
                company_name = form_data['company']
            ).order_by(register_order, remaining_order, level_order)

---

现在的问题是：我的一些表单数据字段可能是空的，因为表单是由用户输入的，他/她可以选择只输入一些字段，我想知道当一些字段为空时，这段代码是否可以工作，如果不能，如何重写它以根据用户输入的字段获得查询集？

逻辑可能是这样的：

# start with this
students = Student.objects.filter(sales=current_user)

value = form.cleaned_data.get('nickname', None)
if value is not None:
    students = students.filter(nickname=value)

# etc, etc ...

# end with that
students = students.order_by(register_order, remaining_order, level_order)

students = Student.objects.filter(sales=current_user)
    
fields = ['nickname', 'mobile', 'gender', ....]
for field in fields:
    value = form.cleaned_data.get(field, None)
    if value is not None:
        students = students.filter(**{field: value})
    
students = students.order_by(register_order, remaining_order, level_order)

但当然，考虑到你有多少领域，这将是丑陋的。相反，您可以有如下内容：

# start with this
students = Student.objects.filter(sales=current_user)

value = form.cleaned_data.get('nickname', None)
if value is not None:
    students = students.filter(nickname=value)

# etc, etc ...

# end with that
students = students.order_by(register_order, remaining_order, level_order)

students = Student.objects.filter(sales=current_user)
    
fields = ['nickname', 'mobile', 'gender', ....]
for field in fields:
    value = form.cleaned_data.get(field, None)
    if value is not None:
        students = students.filter(**{field: value})
    
students = students.order_by(register_order, remaining_order, level_order)

或者，使用表单的所有字段：

students = Student.objects.filter(sales=current_user)
    
for key, value in form.cleaned_data.items():
    if value is not None:
        students = students.filter(**{key: value})
    
students = students.order_by(register_order, remaining_order, level_order)

---

请注意，我们正在测试

if value不是None

而不是

if value

，这是为了允许“0”值通过测试。

逻辑可能如下所示：

# start with this
students = Student.objects.filter(sales=current_user)

value = form.cleaned_data.get('nickname', None)
if value is not None:
    students = students.filter(nickname=value)

# etc, etc ...

# end with that
students = students.order_by(register_order, remaining_order, level_order)

students = Student.objects.filter(sales=current_user)
    
fields = ['nickname', 'mobile', 'gender', ....]
for field in fields:
    value = form.cleaned_data.get(field, None)
    if value is not None:
        students = students.filter(**{field: value})
    
students = students.order_by(register_order, remaining_order, level_order)

但当然，考虑到你有多少领域，这将是丑陋的。相反，您可以有如下内容：

# start with this
students = Student.objects.filter(sales=current_user)

value = form.cleaned_data.get('nickname', None)
if value is not None:
    students = students.filter(nickname=value)

# etc, etc ...

# end with that
students = students.order_by(register_order, remaining_order, level_order)

students = Student.objects.filter(sales=current_user)
    
fields = ['nickname', 'mobile', 'gender', ....]
for field in fields:
    value = form.cleaned_data.get(field, None)
    if value is not None:
        students = students.filter(**{field: value})
    
students = students.order_by(register_order, remaining_order, level_order)

或者，使用表单的所有字段：

students = Student.objects.filter(sales=current_user)
    
for key, value in form.cleaned_data.items():
    if value is not None:
        students = students.filter(**{key: value})
    
students = students.order_by(register_order, remaining_order, level_order)

---

请注意，我们正在测试

如果值不是None

而不是

如果值

，这是为了允许“0”值通过测试。

您不应该使用

表单数据

，而应该使用

表单。清理的表单数据

来获取有效数据。可能与我没有粘贴表单数据=某些表单（request.get）重复，我在列表视图中的get_queryset中执行此查询。恐怕情况不同form=some_form（request.get），form_data=form.cleaned_data，对不起，您不应该使用

form_data

，而应该使用

form.cleaned_data

来获取有效数据。可能与我没有粘贴form_data=some_form（request.get）是重复的，我在列表视图的get_queryset中进行此查询，恐怕不是同一个caseform=some_form（request.get），form_data=form.cleaned_data，对不起谢谢你的回答，我选择了第三种方式：）谢谢你的回答，我选择了第三种方式：）