django static Cannot mix str and non-str arguments

I don't know what the difference is supposed to be, but I found a use case difference (using django 1.9.1 running via apache, wsgi on Python 3.4). In my app, I have some images in ImageFields in the database. If I use code like this in my template:

<a href="object-{{object.id}}"><img src="{% static object.image %}" height="200px"></a>

then, if I use {% load static %}, django thorws a TypeError (Cannot mix str and non-str arguments). This is presumably because the object.image is not a string, it's an ImageField, that gets converted to a string at some later stage. However, if one uses {% load staticfiles %} no such error occurs.

Unfortunately, I discovered this difference after spending hours trying to debug the problem. I managed to find a workaround for when using the first option, namely to add a string-converter method to the object like this:

#image stringdef image_str(self):    return str(self.image)

Hope this knowledge will be of use to someone.

原链接：https://stackoverflow.com/questions/24238496/what-is-the-difference-between-load-staticfiles-and-load-static