Django how to use template tag - Imagekit app

Question

models.py

def get_upload_file_name(instance, filename):
    return "uploads/%s/%s/profile_photo/%s" % (instance.user.username[:1], instance.user.username, filename)

class UserProfile(models.Model):
    ###.....
    photo = models.ImageField(upload_to = get_upload_file_name, 
                              blank = True, null = True,
                              height_field = 'photo_height',
                              width_field = 'photo_width')

So if the the current user.username is John the profile picture would go to uploads/J/John/profile_photo/filename

views.py :

from .image_processors import register_generator

#.....

@login_required
def EditProfile(request):

    register_generator()
    #....

image_processors.py

from imagekit import ImageSpec, register
from imagekit.processors import ResizeToFill

class Thumbnail(ImageSpec):
    processors = [ResizeToFill(60, 80)]

def register_generator():
    register.generator('user_profile:thumbnail', Thumbnail)

Finally, the template contains:

{% generateimage 'user_profile:thumbnail' source=source_image %}

My question is:

what should source_image be? it is not specified in the official documentation. I tried to do source = '/static/uploads/J/John/profile_photo/EU.jpg' , but then I get the error 'SafeText' object has no attribute 'name'

if source_image should be the path to the image, how to dinamically specify it? Thanks

Answer 1

source_image needs to be a file object. (For example, a_user_profile.photo .)

It may not be super clear but it is in the docs :

Additional keyword-style arguments are passed to the registered generator class. As we saw above, image spec constructors expect a source keyword argument, so that's what we need to pass to use our thumbnail spec

And earlier :

source_file = open('/path/to/myimage.jpg')
image_generator = Thumbnail(source=source_file)
result = image_generator.generate()

If you can think of some wording that'll make this more clear, please submit a pull request!