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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
test/aggregates/support/multi_bank_account.ex
defmodule Commanded.Aggregate.Multi.BankAccount do
defstruct [
account_number: nil,
balance: 0,
state: nil,
]
alias Commanded.Aggregate.Multi
alias Commanded.Aggregate.Multi.BankAccount
defmodule Commands do
defmodule OpenAccount, do: defstruct [:account_number, :initial_balance]
defmodule WithdrawMoney, do: defstruct [:account_number, :transfer_uuid, :amount]
end
defmodule Events do
defmodule BankAccountOpened, do: defstruct [:account_number, :balance]
defmodule MoneyWithdrawn, do: defstruct [:account_number, :transfer_uuid, :amount, :balance]
end
alias Commands.{OpenAccount,WithdrawMoney}
alias Events.{BankAccountOpened,MoneyWithdrawn}
def execute(
%BankAccount{state: nil},
%OpenAccount{account_number: account_number, initial_balance: initial_balance})
when is_number(initial_balance) and initial_balance > 0
do
%BankAccountOpened{account_number: account_number, balance: initial_balance}
end
def execute(
%BankAccount{state: :active} = account,
%WithdrawMoney{amount: amount})
when is_number(amount) and amount > 0
do
account
|> Multi.new()
|> Multi.execute(&withdraw_money(&1, amount))
|> Multi.execute(&check_balance/1)
end
# state mutatators
def apply(
%BankAccount{} = state,
%BankAccountOpened{account_number: account_number, balance: balance})
do
%BankAccount{state |
account_number: account_number,
balance: balance,
state: :active,
}
end
def apply(%BankAccount{} = state, %MoneyWithdrawn{balance: balance}),
do: %BankAccount{state | balance: balance}
# private helpers
defp withdraw_money(%BankAccount{account_number: account_number, balance: balance}, amount) do
%MoneyWithdrawn{
account_number: account_number,
amount: amount,
balance: balance - amount
}
end
defp check_balance(%BankAccount{balance: balance})
when balance < 0
do
{:error, :insufficient_funds_available}
end
defp check_balance(%BankAccount{}), do: []
end