如何将数据从ModelForm保存到django中的数据库？

Question

我有一个模特:

class Cost(models.Model):
    project = models.ForeignKey(Project)
    cost = models.FloatField()
    date = models.DateField()

对于模型我创建了一个ModelForm类:

class CostForm(ModelForm):
    class Meta:
        model = Cost
        fields = ['date', 'cost']

用view.py:

def cost(request, offset):
    if request.method == 'POST':
        # NOTE: How to save the data in DB?
        return HttpResponseRedirect('/')
    else:
        form = CostForm()

和下一个模板:

<form action="/cost/{{ project }}/" method="post" accept-charset="utf-8">
    <label for="date">Date:</label><input type="text" name="date" value={{ current_date }} id="date" />
    <label for="cost">Cost:</label><input type="text" name="cost" value="0" id="cost" />
    <p><input type="submit" value="Add"></p>
</form>

题

如何将数据从表单保存到数据库？

一些其他信息:

model.py 包含

class Project(models.Model):
    title = models.CharField(max_length=150)
    url = models.URLField()
    manager = models.ForeignKey(User)
    timestamp = models.DateTimeField()

我的尝试

我尝试以下一种方式实现解决方案(注意:offset =项目名称):

def cost(request, offset):
    if request.method == 'POST':
        form = CostForm(request.POST)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.project = Project.objects.filter(title=offset)
            instance.date = request.date
            instance.cost = request.cost
            instance.save()
        return HttpResponseRedirect('/')
    else:
        form = CostForm()

但它不起作用:(

Answer 1

有些事情看起来不对劲:

1. Project.objects.filter()将返回一个查询集.Project.objects.get()改为使用......它只返回一个Project对象

2. 您不需要明确设置成本和日期,这将由您的处理 instance=form.save(commit=False)

3. 您没有在模板中使用该表单...

试试这个:

模板:

<form action="/cost/{{ project }}/" method="post" accept-charset="utf-8">
     {{form.as_p}}
     <p><input type="submit" value="Add"></p>
</form>

视图:

def cost(request, offset):
    if request.method == 'POST':
        form = CostForm(request.POST)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.project = Project.objects.get(title=offset)
            instance.save()
            return HttpResponseRedirect('/')
    else:
        form = CostForm()

    render_to_response('path/to/template.html',{'form':form},context_instance=RequestContext(request))

此外,我认为您需要在模型中添加blank=True您models.ForeignKey(Project)的内容Cost.这将允许您的ModelForm进行验证.

Answer 2

我找到了解决方案.重写view.py如下:

def cost(request, offset):
    if request.method == 'POST':
        project  = Project.objects.get(title=offset)
        date     = request.POST.get('date', '')
        cost     = request.POST.get('cost', '')
        cost_obj = Cost(project=project, date=date, cost=cost)
        cost_obj.save()
        return HttpResponseRedirect('/')

其余的代码没有改变.