I recently ran into this problem too for the first time. Essentially
this boils down to my not being able to use a templatetag in a loop in
some cases. What is the simple workaround that I'm missing?
-Steve
On May 5, 2:12 pm, Apreche <apre...@gmail.com> wrote:
> I had a really strange bug in one of my custom template tags today. It
> took me the entire morning to figure it out, but I finally did. I'm
> not sure if it's a bug or a feature, but I wanted to make a post to
> help the next person who has this same problem.
>
> Let's pretend you make a custom template tag foo. The render method
> for foo is in a class FooNode, and you pass it a person from the
> context.
>
> {% foo persona %}
> {% foo personb %}
>
> Then, as is common, you have a list of people that you render with a
> loop in the template.
>
> {% for person in people %}
> {% foo person %}
> {% endfor %}
>
> It turns out that when a template tag stands alone, the __init__ of
> FooNode will be called each time the template tag appears. However,
> when the template tag is inside of a loop, the __init__ of the FooNode
> is only called once. That single instance of FooNode sticks around,
> and it's render method is called over and over as the loop goes
> around.
>
> This doesn't seem like that big of a deal. However, my template tag
> was written in such a way that data members of FooNode were being set
> in the __init__ and reused in the render(). Because the initialization
> only happened the first time through the loop, the template tag always
> rendered as if it was for the first person in the list. Those data
> members carried over to subsequent renders because the Node was not
> reinitialized. I managed to fix it, but be aware. If your template
> tags are behaving strangely when they are in loops, this is probably
> the issue.
>
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