Backing a single field with multiple inputs

TLDR:

1. Change the inputs to include an index and optional type ie amount => amount(1i)
2. Add a setter method in the model and handle a hash input:

    class Transaction < ApplicationRecord
        # …
   		
        def amount=(value)
            if value.is_a? Hash
                # do stuff with value[1] etc
            end
   	
            super(value)
        end
   		
        # …
    end
   

3. Profit