forms.FileField() 中的 Django 错误

Question

我的应用程序有问题。 宠物店应用程序。

我创建了 2 个表单。第一个表单允许用户创建自己的商店并将数据保存到我成功完成的模型中，第二个表单允许用户将自己的宠物添加到宠物商店。

第一个表单成功，因为它得到了正确的验证，但我的第二个表单没有成功验证，因为在 PetForm 中，我有一个名为 image = forms.FileField() 的字段，用户可以在其中上传他们的宠物的图片和验证失败，因为图片没有保存在任何地方。

我尝试将参数放入 image = forms.FileField(upload_to="images/") 但我收到一个错误

__init__() got an unexpected keyword argument 'upload_to'

我现在正在阅读文档，它指出“当您在表单中使用 FileField 时，您还必须记住将文件数据绑定(bind)到表单。”。

我无法理解绑定(bind)文件数据。

有人可以帮帮我吗？

我的表单.py

from django import forms
from pet.models import Store
from pet.models import Pet

class StoreForm(forms.ModelForm):
    name = forms.CharField(max_length =20,widget =forms.Textarea)
    number = forms.CharField(max_length =20,widget =forms.Textarea)
    address = forms.CharField(max_length = 20,widget = forms.Textarea)

    class Meta: 
        model = Store
        fields = ('name','number','address')

class PetForm(forms.ModelForm):
    animal =forms.CharField(max_length = 20,widget = forms.Textarea)
    description =forms.CharField(max_length =20, widget = forms.Textarea)
    owner = forms.ModelChoiceField(queryset=Store.objects.all())
    image = forms.FileField()

    class Meta:
        model = Pet
        fields = ('animal','description','owner','image')

我的模型.py

from django.db import models

class Store(models.Model):
    name = models.CharField(max_length = 20)
    number = models.BigIntegerField()
    address =models.CharField(max_length = 20)
    def __unicode__(self):
        return self.name

class Pet(models.Model):
    animal = models.CharField(max_length =20)
    description = models.TextField()
    owner = models.ForeignKey(Store)
    image = models.FileField(upload_to="images/",blank=True,null=True)

    def __unicode__(self):
        return self.animal

这是我的views.py的一部分

从 django.core.files.uploadedfile 导入 SimpleUploadedFile

def fan(request): # this is the function that saves my form into my models.
    form = PetForm(request.POST or None)
    if form.is_valid():
        dad = form.save(commit=False)
        dad.save()
        if 'cat' in request.POST:
            cat = request.POST['next']
        else:
            cat = reverse('world:index')
        return HttpResponseRedirect(cat)
    return render_to_response(
        'fan.html',
        {'form':PetForm()},
        context_instance = RequestContext(request)
)         

和我的粉丝.html

<form method="POST" "action">{% csrf_token %}
    <ul>
        {{ form.as_ul }}
    </ul>
    <input type = "submit" value= "Add Pets to Store" />
</form>

Answer 1

因为你覆盖了你的宠物模型图像。删除表单中的图像。

class PetForm(forms.ModelForm):
    animal =forms.CharField(max_length = 20,widget = forms.Textarea)
    description =forms.CharField(max_length =20, widget = forms.Textarea)
    owner = forms.ModelChoiceField(queryset=Store.objects.all())

    class Meta:
        model = Pet
        fields = ('animal','description','owner','image')

//It's not necessary to defined again model field in the form. Once you call the model 
//in the form it's understood what you want to show. You can only defined the model 
//field again if you want something to add or embed in that field. Like for example you
//want to change the charfield in to textarea or you defined a queryset like you did 
//above. Erase your max_length because you are already defined that in the model.

上传图片时，不要忘记在表单中添加“multipart/form-data”

<form method="POST" enctype="multipart/form-data" "action" >
    {% csrf_token %}
    <ul>
        {{ form.as_ul }}
    </ul>
    <input type = "submit" value= "Add Pets to Store" />
</form>