I log the debt record in the journal page. Example:
#debt
person:: [[some person]]
amount:: 1000
direction:: to ; direction is "from" or "to"
Then I use the below query to track if anyone did not pay back yet or if I still borrow money from some one. I’m still struggling to format the number with comma separator. But I’m quite proud of this query. Took me 1 week to learn clojure, datomic and a lot of trials and errors for this query.
#+BEGIN_QUERY
{:title [:h2 "💴 Debt tracking"]
:query [:find (pull ?p [:block/original-name :block/name :block/properties :block/created-at :block/updated-at]) ?amount ?sign
:where
(page-ref ?b "debt")
(has-property ?b :amount)
[?b :block/properties ?props]
[(get ?props :person) ?person]
[(get ?props :amount) ?amount]
[(get ?props :direction) ?dir]
[(get {"to" 1 "from" -1} ?dir) ?sign]
[?p :block/original-name ?name]
[(contains? ?person ?name)]]
:result-transform (fn [result]
(map (fn [[page amount]] (assoc-in page [:block/properties :total] amount))
(remove (fn[[page amount]] (zero? amount))
(map (fn [group] (reduce (fn [acc n] (list (first n) (+ (second acc) (second n)))) group))
(vals (group-by first (map (fn [[p a s]] (list p (* a s))) (partition 3 result))))))))}
#+END_QUERY
With a little tweak, this query can be used for other things that need accumulation over multiple records, like task effort tracking…
