How to reference entire context as an object?

[wez]

In my application I have a struct that is Serialize being passed in as my context.
I would like to allow my users to optionally do something like {{ context | tojson }}.

Is there built-in syntax or a built-in function that can provide a reference to the overall context like this?
If not, what's the recommended way to approach this?

[cataggar]

May be you are looking for add_global. Here is how I used it.

[mitsuhiko]

There is some risk with this behavior because it makes that you have a self-referential data structure if you are not careful. In pure theory it would be possible to write a globals() function (if an API was added to enumerate all variables in MiniJinja) that returns all variables, but even then you end up with the situation that actual globals are included that you probably don't want such as range(), debug() or that hypothetical globals() function.

What I would do instead is to say that you wrap the context that you pass for rendering with a helper that makes it self-referential within reason (eg: CONTEXT.name is possible, but CONTEXT.CONTEXT.name would fail). I added a simple example here that shows how this goes: https://github.com/mitsuhiko/minijinja/blob/main/examples/self-referential-context/src/main.rs

In short, you would need to change template.render(context!( ... )) with template.render(make_self_referential(context!( ... ))).