Question

I want that each user on my website will have an image in his profile. I don’t need any thumbnails or something like that, just a picture for each user. The simpler the better. The problem is I don’t know how to insert this type of field into my user profile. Any suggestions?

Answer 1

You need to make a form that has a clean method that validates the properties you’re looking for:

#models.py
from django.contrib.auth.models import User

class UserProfile(models.Model):
    user   = models.OneToOneField(User)
    avatar = models.ImageField()


#forms.py
from django import forms
from django.core.files.images import get_image_dimensions

from my_app.models import UserProfile


class UserProfileForm(forms.ModelForm):
    class Meta:
        model = UserProfile

    def clean_avatar(self):
        avatar = self.cleaned_data['avatar']

        try:
            w, h = get_image_dimensions(avatar)

            #validate dimensions
            max_width = max_height = 100
            if w > max_width or h > max_height:
                raise forms.ValidationError(
                    u'Please use an image that is '
                     '%s x %s pixels or smaller.' % (max_width, max_height))

            #validate content type
            main, sub = avatar.content_type.split('/')
            if not (main == 'image' and sub in ['jpeg', 'pjpeg', 'gif', 'png']):
                raise forms.ValidationError(u'Please use a JPEG, '
                    'GIF or PNG image.')

            #validate file size
            if len(avatar) > (20 * 1024):
                raise forms.ValidationError(
                    u'Avatar file size may not exceed 20k.')

        except AttributeError:
            """
            Handles case when we are updating the user profile
            and do not supply a new avatar
            """
            pass

        return avatar