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How to update front matter via Templater templates

· One min read

[[TemplaterPlugin|Templater (Obsidian Plugin)]] doesn't have a straightforward way to update the front matter of a note that already has content in it. However, you can use the native Obsidian API within a template to achieve the same thing.

Side note: this code block keeps getting wiped out. I had thought it was due to transitioning back to submodules. Now, I'm pretty sure it's due to the Templater setting to evaluate templates on file creation, so I removed the Templater delimiters. Put this snippet into a < %* % > block.

// When creating a new file, we would create a race condition between Templater and the native Obsidian APIs we're using here.
// We can circumvent that by utilizing hooks.
tp.hooks.on_all_templates_executed(async () => {
	const file = tp.file.find_tfile(tp.file.path(true));
	await tp.app.fileManager.processFrontMatter(file, (frontmatter) => {
		frontmatter["day"] = [`[[${tp.date.now("YYYY-MM-DD", 0, tp.file.title, "YYYY-MM-DD")}]]`]
		let tags = frontmatter["tags"] ?? []
		tags += "Meetings/Scrum";
		frontmatter["tags"] = tags;
  });
});

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