Max image size on file upload

Question

I have an ImageField in my form. How would I enforce a file size min/max, something like --

image = forms.ImageField(max_size = 2MB) 

or

Answer 1

Here is another option that I didn't see across the variations of this question on stackoverflow: use a custom validator in your models. If you use this technique and a ModelForm in forms.py, then this should be all you need.

models.py

from django.core.exceptions import ValidationError

class Product(models.Model):
    def validate_image(fieldfile_obj):
        filesize = fieldfile_obj.file.size
        megabyte_limit = 5.0
        if filesize > megabyte_limit*1024*1024:
            raise ValidationError("Max file size is %sMB" % str(megabyte_limit))

    image = models.ImageField(upload_to="/a/b/c/", validators=[validate_image])