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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
test/example_domain/money_transfer/money_transfer.ex
defmodule Commanded.ExampleDomain.MoneyTransfer do
@moduledoc false
@derive Jason.Encoder
defstruct transfer_uuid: nil,
debit_account: nil,
credit_account: nil,
amount: 0,
state: nil
alias Commanded.ExampleDomain.MoneyTransfer
defmodule Commands do
defmodule TransferMoney do
@derive Jason.Encoder
defstruct(transfer_uuid: nil, debit_account: nil, credit_account: nil, amount: nil)
end
end
defmodule Events do
defmodule MoneyTransferRequested do
@derive Jason.Encoder
defstruct(transfer_uuid: nil, debit_account: nil, credit_account: nil, amount: nil)
end
end
alias Commands.{TransferMoney}
alias Events.{MoneyTransferRequested}
def transfer_money(%MoneyTransfer{state: nil}, %TransferMoney{
transfer_uuid: transfer_uuid,
debit_account: debit_account,
credit_account: credit_account,
amount: amount
})
when amount > 0 do
%MoneyTransferRequested{
transfer_uuid: transfer_uuid,
debit_account: debit_account,
credit_account: credit_account,
amount: amount
}
end
# State mutators
def apply(%MoneyTransfer{} = state, %MoneyTransferRequested{} = transfer_requested) do
%MoneyTransfer{
state
| transfer_uuid: transfer_requested.transfer_uuid,
debit_account: transfer_requested.debit_account,
credit_account: transfer_requested.credit_account,
amount: transfer_requested.amount,
state: :requested
}
end
end