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defmodule DaProductApp.Transactions.TransactionEvent do |
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@moduledoc """ |
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Event record for transaction aggregate with hash chaining. |
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""" |
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use Ecto.Schema |
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import Ecto.Changeset |
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schema "transaction_events" do |
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field :seq, :integer |
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field :event_type, :string |
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field :payload, :map |
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field :prev_hash, :binary |
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field :hash, :binary |
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belongs_to :transaction, DaProductApp.Transactions.Transaction |
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field :inserted_at, :utc_datetime |
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end |
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@required ~w(seq event_type hash inserted_at transaction_id)a |
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@optional ~w(payload prev_hash)a |
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def changeset(struct, attrs) do |
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struct |
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|> cast(attrs, @required ++ @optional) |
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|> validate_required(@required) |
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|> unique_constraint([:transaction_id, :seq]) |
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end |
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end |