如何使用Dropzone为多个图像字段上传Django中的多个图像

Question

我正在开发一个项目,其功能是用户可以使用拖放功能上传他的多个图像.我正在使用Django-python进行开发.我已经在django模板中实现了drag-n-drop的功能,但是在提交表单数据时我收到图像错误.
我的Html模板代码是:

<form id="newUserForm" name="newUserForm" data-abide action="{% url 'saveNewUserInfo'%}" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        <div class="section"></div>
            some input fields
        <!-- The div for uploading the images -->
        <div class="dropzone" style="border: 1px solid red;"></div>
        <input type="submit" value="save">
</form>

我正在使用dropzone.js来实现拖放和可排序错误正在以MultiValueDictKeyError at /saveNewUserInfo/, Exception Value: "'file'"
我的模型为例:

class CustomerProfile(models.Model):
    customer_id  = models.CharField(db_column='customer_id', primary_key=True, max_length=20)  
    first_name   = models.CharField(db_column='first_name', max_length=30, blank=True, null=True) 
    last_name    = models.CharField(db_column='last_name', max_length=30,blank=True,null=True) 
    user_name    = models.CharField(db_column='user_name', max_length=50,unique=True)  
    phone_number = models.CharField(db_column='phone_number', max_length=15,blank=True,null=True)
    email_id     = models.EmailField(db_column='email_id', max_length=50,blank=True, null=True)  
    user_image1 = models.ImageField(upload_to=IMAGES_PATH, db_column='user_image1', max_length=100)  
    user_image2 = models.ImageField(upload_to=IMAGES_PATH, db_column='user_image2', max_length=100)  
    user_image3 = models.ImageField(upload_to=IMAGES_PATH, db_column='user_image3', max_length=100)  
    user_image4 = models.ImageField(upload_to=IMAGES_PATH, db_column='user_image4', max_length=100) 
    user_image5 = models.ImageField(upload_to=IMAGES_PATH, db_column='user_image5', max_length=100) 

forms.py

class CustomerInfoForm(forms.ModelForm):

    class Meta:
        model = CustomerProfile

请建议如何将dropzone多个图像存储到这些图像字段中.欣赏建议..

Answer 1

我很高兴你已经解决了这个问题。我花了几个小时解决这个问题，这就是我的解决方法：

使用 dropzone 的主要问题是，一旦将文件放入其中，它就会开始上传。因此，图像不会与其余表单数据一起上传。

为了解决这个问题，我必须使用以下设置以编程方式创建 dropzone 对象：

$(document).ready(function(){
  var list_of_files = new Array();
  Dropzone.autoDiscover = false;  //prevent dropzone to automatically discover the dropzone object in your html
  $("div#dropzone").dropzone({
        uploadMultiple: true, // allow multiple upload
        autoProcessQueue: false, // prevent dropzone from uploading automatically
        url: "/", //dropzone needs a url attribute or it complains, what value you put here does not really matter. It is only purpose is to prevent a javascript error message from chrome console
        maxFiles: 5, //set max uploads to 5 since you only have 5 image files in your model
        init: function(){
            //everytime a file is uploaded, save the file object
            //for later use
            this.on("addedfile", function(file)
            {
                if (list_of_files.length < 5)
                {
                    list_of_files.push(file)
                    console.log("file added");
                }
            });
        }
    });

  // the following function override the "submit" button in the form
  $(document).on("click", "button", function(e){
        e.preventDefault() //prevent the form from submitting 
        console.log('num of files: ' + list_of_files.length);
        var formData = new FormData(); // construct our own upload data
        var inputs = $("#newUserForm input");

        //get all of the data from textboxes
        $.each(inputs, function(obj, v){
            var name = $(v).attr("name")
            var val = $(v).val();
            console.log('name: ' + name + ' value: ' + val);
            formData.append(name, val);
        });

        //get the file object from dropzone and put it into our formdata
        for(i=0;i<list_of_files.length;i++)
        {
            formData.append('user_image'+(i+1), list_of_files[i]);
        }

        var request = new XMLHttpRequest();
        request.open("POST", "/"); //config your post url here
        request.send(formData);  //send the post request to server
    });
});

这是模板文件：

<form id="newUserForm" name="newUserForm" method="post" enctype="multipart/form-data">
    {% csrf_token %}

    {% if form %}
       {% for field in form %}
            <p>{{ field.label_tag }} {{ field }}</p>
       {% endfor %}

    {% endif %}
    <!-- The div for uploading the images -->
    <div id="dropzone" class="dropzone"></div>
    <button id='save'> save </button>
</form>

我还在forms.py中添加了排除（这样这些字段就不会出现在我们的模板中，我们有 dropzone 来替换它们）：

class CustomerInfoForm(forms.ModelForm):

class Meta:
    model = CustomerProfile
    exclude=('user_image1','user_image2','user_image3','user_image4','user_image5')

上面的所有代码所做的就是将每个文本框中的数据与图像一起提交到您的views.py，一步完成

这是views.py：

def index(request):
    if request.method == 'POST':
        form = CustomerInfoForm(request.POST)

        if (form.is_valid()):
            instance = form.save(commit=False)
            #request.FILES contains all of the uploaded images
            #key is 'user_image1', 'user_image2', value is the image file in memory
            for key, value in request.FILES.iteritems():
                a_path = '/a/b'
                save_uploadfile_to_disk(a_path, file) 
                setattr(instance, key, a_path) //I made up the path here
            form.save() //save the form for real
            #do not forget to return a response
        else:
            print form.errors  #for debugging only 

    else:
        form = CustomerInfoForm()
        context = {'form': form}
        return render(request, 'test_dropzone/index.html', context)

def save_uploadfile_to_disk(full_path, file):
    with open(full_path, 'w+') as destination:
        for chunk in file.chunks():
            destination.write(chunk)

我使用 Django 1.8 测试了这个解决方案，它有效。我检查了数据库，路径已正确写入记录。

现在，反思这个解决方案，它有点违背了使用 dropzone 的目的。因为用户一旦选择文件就无法上传照片。

既然你也解决了这个问题。请发布您的解决方案，我期待从您的解决方案中学到新的东西:)