Proper syntax for applying slice to parent passed to child filename formatting in config

[reasonabledoubt]

Hello, passing a parent from a reddit extractor to a, for example, imgur or redgifs extractor:

my reddit extractor works fine with

        "reddit":
        {
            "parent-skip": true,
            "parent-directory": true,
            "parent-metadata": "_reddit",
            "filename": "{id}-{title[:180]}{num:?-//>02}-{filename}.{extension}"
        },

but then my redgifs extractor doesn't like

        "redgifs":
        {
            "directory": {
                "'_reddit' in locals()": []
                },

            "filename": {
                "'_reddit' in locals()": "{_reddit[id]}_{_reddit[title[:180]]}{num:?-//>02}.{extension}"
                 }
        },

and I'll see errors like

[redgifs][error] FilenameFormatError: Applying filename format string failed (ValueError: invalid literal for int() with base 10: 'title')

Do I need to be doing something different with the brackets? The files /seem/ to save correctly even though I'm getting the error, but I want to be sure I'm not going to be having issues in the future with that error.

[mikf]

{_reddit[title[:180]]} should be {_reddit[title][:180]}

---

You might want to use parent>child as category, since that makes things a bit simpler:

        "reddit>redgifs":
        {
            "directory": []
            "filename": "{_reddit[id]}_{_reddit[title][:180]}{num:?-//>02}.{extension}"
        }

[reasonabledoubt]

Excellent, thank you!