Python Django ModelForm未能保存

我有一个Django模型，如下所示：

def postproperty(request):
    context = RequestContext(request)
    if request.method == 'POST':
        form = PostForm(request.POST, request.FILES)
        if form.is_valid():
            form.save(commit=True)
            return HttpResponseRedirect(reverse('postthanks'))
        else:
            print form.errors

    else:
        form = PostForm()

    content = {'form': form}
    return render_to_response('postproperty.html', content, context)

models.py

class Property(models.Model):
    id = models.AutoField(unique=True, primary_key=True)
    name = models.CharField(max_length=500)
    desc = models.CharField(max_length=2000)
    address_line1 = models.CharField(max_length=200)
    address_line2 = models.CharField(max_length=200)
    locality = models.CharField(max_length=200, default=0)
    city = models.CharField(max_length=200)
    state = models.CharField(max_length=200)
    pin = models.BigIntegerField(max_length=200)
    phone = models.BigIntegerField(max_length=20)
    secondary_number = models.BigIntegerField(max_length=20, blank=True)
    image = models.ImageField(upload_to='dynamic/img')
    square_feet = models.BigIntegerField(max_length=200, default=0)
    price = models.BigIntegerField(max_length=200, default=0)
    NO = 'NO'
    YES = 'YES'
    APPROVAL = ((NO, 'no'), (YES, 'yes'))
    active = models.CharField(choices=APPROVAL, default=NO, max_length=3)

    def __unicode__(self):
        return self.name

此模型的模型形式：

class PostForm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter name for Property'}), required=True)
    desc = forms.CharField(widget=forms.Textarea(attrs={'class': 'form-control input-area', 'placeholder': 'Enter a small description', 'rows': '5', 'style': 'resize:none;'}), required=True)
    address_line1 = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter first line of address'}), required=True)
    address_line2 = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter second line of address'}), required=True)
    locality = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter locality'}), required=True)
    city = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter city name'}), required=True)
    state = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter state name'}), required=True)
    pin = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter pincode'}), required=True)
    phone = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter contact number'}), required=True)
    secondary_number = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter secondary contact number'}), required=False)
    image = forms.FileInput()
    square_feet = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter area of property in square feet'}), required=True)
    price = forms.IntegerField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter price of property in Rupees'}), required=True)
    NO = 'NO'
    YES = 'YES'
    APPROVAL = ((NO, 'no'), (YES, 'yes'))
    active = forms.CharField(widget=forms.HiddenInput(), initial=NO)

    class Meta:
        model = Property

我的views.py如下所示：

def postproperty(request):
    context = RequestContext(request)
    if request.method == 'POST':
        form = PostForm(request.POST, request.FILES)
        if form.is_valid():
            form.save(commit=True)
            return HttpResponseRedirect(reverse('postthanks'))
        else:
            print form.errors

    else:
        form = PostForm()

    content = {'form': form}
    return render_to_response('postproperty.html', content, context)

该模板包含以下内容：

<form id="property_form" method="POST" action="">
    {% csrf_token %}
    {% if form.errors %}
        <p style="color: red;">
            Please correct the error{{ form.errors|pluralize }} below.
        </p>
    {% endif %}
    {% for hidden in form.hidden_fields %}
        {{ hidden }}
    {% endfor %}
    {% for field in form.visible_fields %}
        {{ field.help_text}}
        {{ field }}
    {% endfor %}
    <input type="submit" name="submit" value="Add Property" class="btn btn-info test-button" style="margin-top:20px;"/>
</form>

{%csrf_令牌%}
{%if form.errors%}

请更正下面的错误{form.errors | pluralize}}。

{%endif%}
{%用于隐藏在表单中。隐藏的_字段%}
{{隐藏}}
{%endfor%}
{%form.visible_fields%}
{{field.help_text}
{{field}}
{%endfor%}

表单在模板中正确呈现。当我从模板中保存表单时，它会告诉我

，请更正下面的错误
。没有指定错误，我不知道哪个字段似乎给了我错误。
谢谢你的帮助

编辑：
正如Daniel所说，我在模板中添加了
{{field.errors}
和
{{form.non_field_errors}}
。它在图像字段中显示错误。为什么会这样
 嗯，模板中没有显示任何错误。除了每个字段和标签之外，您还应该在表单的to处添加
{{field.errors}
，再加上
{{form.non_field_errors}}
。
需要将其添加到模板中：

这样做，会给图像字段带来一个错误，它说图像字段是必需的