Question

我是python的新手，我正在使用django进行学生数据库应用。学生数据库应用程序必须显示id，firstname，lastname，subjectnames，marks。单身学生有多个科目和他们的分数。我在访问学生有多个科目和分数的多个值时遇到了问题。

models.py

class Person(models.Model):
    firstname=models.CharField(max_length=50)
    lastname=models.CharField(max_length=50)

    def __unicode__(self):
        return (self.firstname,self.lastname)


class Marksheet(models.Model):
    subname=models.CharField(max_length=50)
    marks=models.IntegerField(max_length=10)
    person=models.ForeignKey(Person)

    def __unicode__(self):
        return self.subname

views.py

def add_page(request,page_name): # function for creating  the new records
    p1=None
    p2=None
    if request.method=='POST':
        p1=Person(firstname=request.POST['firstname'],lastname=request.POST['lastname'])
        p1.save()
        p2=Marksheet(subname=request.POST.getlist('subnames'),person=Person(person_id))
        p2.save()
    return render_to_response("add.html",{"page_name":page_name})

创建记录我在html中使用表单，如下所示....

模板 add.html

<form method="post" action="/newdcl/{{page_name}}/add/" > {% csrf_token %}
    First name:  <input type="text" name="firstname" /> <br />
    Last name:  <input type="text" name="lastname" /> <br /> 
    Operating System  <input value="os" name="subnames" type="checkbox"><br />
    System Programming <input value="sp" name="subnames" type="checkbox"> <br />
    Maths <input value="maths" name="subnames" type="checkbox"> <br />        
    <input type="submit" value="save" >
</form>

任何人都可以帮助我吗????

Answer 1

您的问题似乎在于您尝试创建标记表的方式，您无法将值列表分配给一个字段。使用您当前无形，可怕，无需验证的设置......您可以执行以下操作 -

p1=Person(firstname=request.POST['firstname'], 
          lastname=request.POST['lastname'])
p1.save()
for subname in request.POST.getlist('subnames'):
    new = MarkSheet(subname=subname, person=p1) 
        #no data for marks, must define it to be able to be blank/null
    new.save()

如果您打算没有任何初始标记，则需要将blank=True, null=True添加到models.py中的标记字段。

请查看Making Queries和Forms

Answer 2

在我看来，它应该通过在Person中使用多对多关系来完成，并且表单应该被定义为表单类，因为你的表单中没有任何验证，而你正在编写一些html，这可以通过在模板中放入一行代码来生成。我会这样做：

models.py

class Marksheet(models.Model):
    subname=models.CharField(max_length=50)
    marks=models.IntegerField(max_length=10)

    def __unicode__(self):
        return self.subname

class Person(models.Model):
    firstname=models.CharField(max_length=50)
    lastname=models.CharField(max_length=50)
    marksheets = models.ManyToManyField(Marksheet)

    def __unicode__(self):
        return (self.firstname,self.lastname)

forms.py 来自模型导入人

class PersonForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(PersonForm, self).__init__(*args, **kwargs)
        # by default m2m relation is rendered with SelectMultiple widget -
        # - below line is changing it to checkbox list
        self.fields['marksheets'].widget = forms.CheckboxSelectMultiple()
    class Meta:
        model = Person

views.py

#inside your view function
if request.method == 'POST':
    form = PersonForm(request.POST)
    if form.is_valid():
        form.save()

# pass form to template in render_to_response

add.html

<form method="post" action="/newdcl/{{page_name}}/add/" > {% csrf_token %}
    {{ form }}
    <input type="submit" value="save" >
</form>

使用django访问多个值的问题

2 个答案: