Ecto aggregate functions sometimes return Decimal.

[aglassman]

Problem
I modified a table's 'amount_in_cents' column to be the PostgreSQL type bigint rather than integer. This seems to have caused calls using Repo.aggregate calls to fail to load the result type into a Money struct.

schema "adjustments" do
  field :amount_in_cents, Money.Ecto.Amount.Type
  # ...
end


#

query = from(a in Adjustment, where a.wallet_id == ^wallet_id)
Repo.aggregate(query, :sum, :amount_in_cents)

This results in the following issue.

I'm not totally sure why aggregate changes it's return type from an integer to a Decimal.
This causes Money.Ecto.Amount.Type.load/1 to fail to match.

Proposed Solution
Add a new function head to the load function.

@spec load(integer()) :: {:ok, Money.t()}
    def load(int) when is_integer(int), do: {:ok, Money.new(int)}
    def load(%Decimal{} = decimal), do: Money.parse(decimal) 

[Nitrino]

Thanks for the description and solution!