has_amount

has_amount exposes two or more physical columns as one logical amount attribute.

Example

ruby

class Holding < ApplicationRecord
  has_amount :amount
  has_amount :fee, symbol: :SOL
end

What the writer accepts

For multi-symbol attributes:

Amount
compact string like "USDC|1.50"
hash payloads

For fixed-symbol attributes:

all of the above
raw numerics such as 0.25

Dirty tracking helpers

ruby

holding.amount_changed?
holding.amount_change
holding.saved_change_to_amount?
holding.amount_before_last_save