Acme Bank v1.0.0-dev Bank.Ledger
A simple implementation of double-entry accounting system.
Basically, we store every Bank.Ledger.Entry twice - once for each account affected.
Thus, if Alice transfers $10.00 to Bob we’ll have two entries:
- debit Alice’s account for $10.00
- credit Bob’s account for $10.00
Bank.Ledger.Entry can be a credit or a debit. Depending on Bank.Ledger.Account’s type,
a credit can result in the increase (or decrease) of that accounts’ balance.
See balance/1.
Double-entry accounting system implementation is usually required for compliance with other financial institutions.
Summary
Functions
Returns account’s balance as Money.
We calculate balance over all account’s entry.
Balance increases or decreases are based on Bank.Account’s type
and Bank.Entry’s type according to this table:
| Debit | Credit
----------|----------|---------
Asset | Increase | Decrease
Liability | Decrease | Increase