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32 lines
789 B
Elixir
32 lines
789 B
Elixir
defmodule AshDoubleEntry.Account.Calculations.BalanceAsOfUlid do
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@moduledoc """
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Calculates the balance as of a given transfer id. See the getting started guide for more.
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"""
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use Ash.Calculation
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require Ash.Expr
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def expression(opts, context) do
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resource = opts[:resource]
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ref = %Ash.Query.Ref{
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attribute:
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Ash.Query.Aggregate.new!(resource, :balance_as_of_ulid_agg, :first,
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field: :balance,
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path: [:balances],
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default: Decimal.new(0),
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query: [
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filter: [
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transfer_id: [lte: context[:ulid]]
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],
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sort: [
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transfer_id: :desc
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]
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]
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),
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relationship_path: [],
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resource: resource
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}
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Ash.Expr.expr(^ref)
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end
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end
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