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防止Django imageField上传/保存图片

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我有一个带有图像字段的模型,我在保存图像之前执行所有类型的自定义逻辑 . 例如,我调整图像大小并将其上传到服务器 . 然后我将它的路径链接到文件名 .

所以我不需要Django来保存图像,它会覆盖我的自定义大小的图像 .

我想做的是阻止django imagefield自动将图像上传到服务器 . 是否有可能做到这一点 ?

更新代码:

模型:

class Document(models.Model):
    myField = models.CharField(max_length=500)
    image_main = models.ImageField(blank=True, upload_to=change_filename_to_slug)
    image_thumbsize_big = models.ImageField(blank=True)
    image_thumbsize_small = models.ImageField(blank=True)

视图:

def list(request):
    # Handle file upload
    if request.method == 'POST':
        form = DocumentForm(request.POST, request.FILES)
        if form.is_valid():
            instance        = form.save(commit=False)  # Creates a modifiable instance

            instance.save()
            return HttpResponseRedirect('/list/')
    else: .....

处理文件上载过程的函数 . 它处理我需要的所有进程,创建适当大小的文件并将其放在目录中 . 问题是,当实例由django保存时,它会自己创建文件,因此我有2个文件,并且使用了错误的文件 . 我只想短路django并阻止imagefield表单创建它的文件:

def change_filename_to_slug(instance, filename):

    file = instance.image_main
    # Variables
    save_media_dir = instance.mediaUrl + instance.saveImagepath  # Passed by model
    base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) + save_media_dir
    im = Image.open(file)
    slug = slugify(instance.myField, allow_unicode=True)
    finalpath = None
    has_iterated = 0

for key, value in sizes.items():
    im_reset = im
    im_reset = im_reset.resize(value, Image.ANTIALIAS)
    save_dir = base_dir + slug + key
    field_file_name = save_media_dir


    if im.format.lower() == 'png':
        # Save in folder : no need to save again
        im_reset.save(save_dir + '.png', compress_level=png_compress, format='PNG')  
        # Save names in fields:
        if has_iterated == 0: finalpath =  'dir/' +  slug + key + '.png'  
        if has_iterated == 1: instance.image_thumbsize_big = field_file_name + slug + key + '.png'
        if has_iterated == 2: instance.image_thumbsize_small = field_file_name + slug + key + '.png'
        has_iterated += 1


return finalpath

表格:

from .models import Document
from django.forms import ModelForm

class DocumentForm(ModelForm):
    class Meta:
        model = Document
        fields = ['myField', 'image_main', 'image_thumbsize_big', 'image_thumbsize_small']

1 回答

  • 1

    我会尝试覆盖Form的 save 方法:

    class DocumentForm(ModelForm):
    
        def __init__(self, post_data, files_data):
            self.image_main_file = files_data.get('image_main', None)
            return super(DocumentForm, self).__init__(post_data, files_data)
    
        def save(self, force_insert=False, force_update=False, commit=True):
            instance = super(DocumentForm, self).save(commit=False)
            # do your image magic here, e.g.
            # instance.image_thumbsize_big = field_file_name + slug + key + '.png'
    
            # you can access your main file with: self.image_main_file
            if commit:
                instance.save()
            return instance
    

    然后在列表视图中:

    def list(request):
        # Handle file upload
        if request.method == 'POST':
            form = DocumentForm(request.POST, request.FILES)
            if form.is_valid():
                instance        = form.save(commit=True)
                return HttpResponseRedirect('/list/')
        else: .....
    

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