blockscout/lib/explorer/schemas/from_address.ex

defmodule Explorer.FromAddress do
  @moduledoc false

  use Explorer.Schema

  alias Explorer.FromAddress

  @primary_key false
  schema "from_addresses" do
    belongs_to(:transaction, Explorer.Transaction, primary_key: true)
    belongs_to(:address, Explorer.Address)
    timestamps()
  end

  def changeset(%FromAddress{} = to_address, attrs \\ %{}) do
    to_address
    |> cast(attrs, [:transaction_id, :address_id])
    |> unique_constraint(:transaction_id, name: :from_addresses_transaction_id_index)
  end
end