Django表格对某些宽度和高度的图像场验证

Question

我正在尝试验证表单级别的图像维度，并在提交的照片不符合图像尺寸1080x1920的要求时向用户显示消息。我不想在数据库中存储宽度和高度大小。我尝试使用Imagefield的width和height属性。但它没有用。

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

你可以用两种方式做到这一点

1. 在模型中验证 来自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. 清洁形式

           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")