ecto_multi.ex

@spec create_merchant(map()) :: {:ok, Merchant.t()} | {:error, Ecto.Changeset.t()}
  def create_merchant(attrs) do
   temp_password = generate_password(8)

    account_params = %{email: attrs.email, password: temp_password, status: 0, group: "merchant"}

    Multi.new
    |> Multi.insert(:account, Account.create_changeset(account_params))
    |> Multi.run(:merchant, fn repo, %{account: acc} ->
      repo.insert(Merchant.create_changeset(Map.put(attrs, :account, acc)))
    end)
    |> Repo.transaction()
    |> case do
      {:ok, %{merchant: mct}} ->

        Notifications.new_lead_email(mct) |> @mail_api.deliver_now()
        Notifications.password_email(%{mct | password: temp_password})

        {:ok, mct}

      {:error, :account, acc_res, _} ->
        {:error, acc_res}

      {:error, :merchant, mct_res, _} ->
        {:error, mct_res}
    end
  end