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Tricks & Techniques
2

I do something similar with a widget (my notes are tagged with #quick-note rather than #memo). I like the widget method so I can maintain the content from one location. As opposed to yours, this version also shows only the first line of the quick note as a snippet since I'm still using the main Journal page for content.

function markdown.extractSnippet(content)
  content = index.extractFrontmatter(content, {removeFrontMatterSection=true}).text
  return string.split(string.trim(content), "\n")[1]
end

templates.fullPageItemSnippet = template.new[=[- [[${ref}|${ref}]]
  - "${markdown.extractSnippet(space.readPage(ref))}"
]=]

function widgets.linkedQuickNotes(date)
  local notes = query[[from p = index.tag "quick-note" where p.tag == "page" and p.date == date]]
  if some(notes) then
    return widget.markdownBlock("# Linked Quick Notes\n" .. template.each(notes, templates.fullPageItemSnippet))
  end
end

event.listen {
  name = "hooks:renderBottomWidgets",
  run = function(e)
    local page = editor.getCurrentPage()
    local meta = editor.getCurrentPageMeta()
    if not page or not meta then
      return
    end
    if table.includes(meta.tags, "journal") and meta.date then
      return widgets.linkedQuickNotes(meta.date)
    end
  end
}