django-imagekit: TypeError: 'ImageCacheFile' object is not subscriptable

I have gotten this error bellow, But It got fixed reloading (weird)

Stack: Ubuntu 14.04 python 3.4 django 1.8.16

Error:

Traceback (most recent call last):
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 819, in _resolve_lookup
    current = current[bit]
TypeError: 'ImageCacheFile' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/inmoduran/inmoduran/landing/views.py", line 263, in property
    'description': piso.pub_name(),
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/shortcuts.py", line 67, in render
    template_name, context, request=request, using=using)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/loader.py", line 99, in render_to_string
    return template.render(context, request)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/backends/django.py", line 74, in render
    return self.template.render(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 210, in render
    return self._render(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 202, in _render
    return self.nodelist.render(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 905, in render
    bit = self.render_node(node, context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 919, in render_node
    return node.render(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/defaulttags.py", line 224, in render
    nodelist.append(node.render(context))
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 959, in render
    output = self.filter_expression.resolve(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 648, in resolve
    obj = self.var.resolve(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 789, in resolve
    value = self._resolve_lookup(context)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/template/base.py", line 827, in _resolve_lookup
    current = getattr(current, bit)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/__init__.py", line 84, in url
    return self._storage_attr('url')
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/__init__.py", line 74, in _storage_attr
    existence_required.send(sender=self, file=self)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/django/dispatch/dispatcher.py", line 189, in send
    response = receiver(signal=self, sender=sender, **named)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/registry.py", line 53, in existence_required_receiver
    self._receive(file, 'on_existence_required')
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/registry.py", line 61, in _receive
    call_strategy_method(file, callback)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/utils.py", line 151, in call_strategy_method
    fn(file)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/strategies.py", line 15, in on_existence_required
    file.generate()
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/__init__.py", line 93, in generate
    self.cachefile_backend.generate(self, force)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/backends.py", line 109, in generate
    self.generate_now(file, force=force)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/backends.py", line 96, in generate_now
    file._generate()
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/cachefiles/__init__.py", line 97, in _generate
    content = generate(self.generator)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/utils.py", line 134, in generate
    content = generator.generate()
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/imagekit/specs/__init__.py", line 149, in generate
    img = open_image(self.source)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/pilkit/utils.py", line 22, in open_image
    return Image.open(target)
  File "/home/inmoduran/inmoduran/env2/lib/python3.4/site-packages/PIL/Image.py", line 2286, in open
    % (filename if filename else fp))

About this issue

Original URL
State: closed
Created 8 years ago
Comments: 16

Most upvoted comments

@just-paja your exception is different. Your exception is ValueError: I/O operation on closed file. Which is more close to #391.

The original issue title incorrectly points the wrong exception, and actually the traceback seems not full and we can’t see the real exception causing the problem.

Now I understand what is happening. When rendering the template and you have something like {{ var.attr }}, django actually is trying first to get attr as key from dictionary instead of attribute of an object. When this fails with TypeError because the object is not subscriptable (it’s not dictionary like) then it tries to get it as attribute of that object. And now because this attribute (probably url or with/height) is a property and not simple value then some logic is executed which raised the error. We care about the second error.

vstoykov on Nov 22, 2017