特定宽度和高度的 Django Form Imagefield 验证

Question

我正在尝试验证表单级别的图像尺寸，如果提交的照片不符合图像尺寸 1080x1920 的要求，则会向用户显示一条消息。我不想将宽度和高度大小存储在数据库中。我尝试使用 Imagefield 宽度和高度属性。但它不起作用。

class Adv(models.Model):

    image = models.ImageField(upload_to=r'photos/%Y/%m/',
        width_field = ?,
        height_field = ?,
        help_text='Image size: Width=1080 pixel. Height=1920 pixel',

Answer 1

有两种方式

1. 模型验证

   从 django.core.exceptions 导入 ValidationError

   def validate_image(image):
       max_height = 1920
       max_width = 1080
       height = image.file.height 
       width = image.file.width
       if width > max_width or height > max_height:
           raise ValidationError("Height or Width is larger than what is allowed")
   
   class Photo(models.Model):
       image = models.ImageField('Image', upload_to=image_upload_path, validators=[validate_image])
   

2. 表单清理

           def clean_image(self):
               image = self.cleaned_data.get('image', False)
               if image:
                   if image._height > 1920 or image._width > 1080:
                       raise ValidationError("Height or Width is larger than what is allowed")
                   return image
               else:
                   raise ValidationError("No image found")