django q 对象条件匹配

Question

我的问题是，当我选择 datefrom 和 dateto 时，它显示错误。“在中找不到关键‘性别’

现在即使我使用 Q 对象仍然存在与之前相同的问题..

search_gender = request.POST["gender"]
age_from = request.POST["age_from"]
age_to = request.POST["age_to"]
date_from = request.POST["date_from"]
date_to = request.POST["date_to"]

if date_from:
    date_from = datetime.strptime(request.POST["date_from"],"%d %B %Y")

if date_to:
    date_to = datetime.strptime(request.POST["date_to"],"%d %B %Y")

patient = PatientInfo()

p_male = 0
p_female = 0
age1 = 0
age2 = 0
date1 = 0
date2 = 0

if search_gender == 'male' :
    p_male = 1
if search_gender == 'female' :
    p_female = 1

if age_from:
    age1 = 1
if age_to:
    age2 = 1
if date_from:
    date1 = 1
if date_to:
    date2 = 1

if date1 and date2:
    patient = PatientInfo.objects.filter(
            Q(dateedit__range = (date_from,date_to))
            )

当我选择 date_from 和 date_to 两者时仍然显示错误???即使我使用了 if request.POST.has_key('gender') 仍然错误，我也没有选择男性或女性 我是 django 的新手..请帮忙...提前感谢..

Answer 1

当尝试查找字典中不存在的键时，会引发您报告的错误 - 几乎正是错误告诉您的内容。

由于我所要做的就是您发布的代码，我的猜测是，无论出于何种原因，“性别”实际上并不存在于 request.POST 字典中。你需要找出原因。

一般来说，在处理字典时，最佳实践是首先检查键是否存在或使用 dict.get 方法提供后备：

# Check for dictionary key
if request.POST.has_key('gender'):
    gender = request.POST['gender']

# or Provide fallback
gender = request.POST.get('gender', 'male') # if gender isn't present, 'male' will be returned

Answer 2

为此，表格将非常有用！

类似于：

forms.pyviews.py

from django import forms

class MyForm(forms.Form):
    GENDERS = (
        ('m','Male'),
        ('f', 'Female')
    )
    gender    = forms.CharField(choices=GENDERS, required=False)
    age_from  = forms.IntegerField()
    age_to    = forms.IntegerField()
    date_from = request.POST["date_from"]
    date_to   = forms.DateTimeField()


    def clean_gender(self):
        gender = self.cleanded_data.get('gender', 'm')

        #do something with gender

        return gender#now it has always a value

：

def myform(request):

if request.method == "POST":
    form = MyForm(request.POST)

    if form.is_valid():
        gender = form.cleaned_data.get('gender')

        #do something with data...


else:
    form = MyForm()

return render_to_response('template.html', {'form':from})