Question

I’m making a custom template tag, and I want to be able to pass it in any sort of value. The use case is something like this:

{% include_with_args "path_to_template.html" simple_var an_object.foo.bar "A String" %}

When evaluating my custom template code, I want to evaluate simple_var, an_object.foo.bar, and "A String", the same way Django would normally. Currently I have

these_args = [context[arg_name] for arg_name in self.arg_names]

However, this only works for variable names (simple_var).

How do I get my template to evaluate these strings just like Django would? That is, if .foo is a function that returns a dict with a "bar" key it should evaluate it as expected: an_object.foo()["bar"].

In simple terms: I want to evaluate an expression to a value. How do I do that from a custom template?

Answer 1

It’s actually very simple. Instead of:

these_args = [context[arg_name] for arg_name in self.arg_names]

do:

these_args = [template.Variable(arg_name).resolve(context) for arg_name in self.arg_names]

Of course, now arg_name is a misnomer, so I changed that, but just wrote it this way to elucidate the differences.