Django Form Imagefield validation for certain width and height

Question

I am trying to validate the image dimension in form level and display a message to user if submitted photo does not meet requirement which is image dimension 1080x1920. I dont want to store the width and height size in database. I tried with the Imagefield width and height attribute. But it is not working.

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

You can do it in two ways

1. Validation in model

   from django.core.exceptions import 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. Cleaning in forms

           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")