ex-cbsf2018's Introduction

Coins

Coins is an example app using CQRS and Event Sourcing.

It uses:

Commanded: Framework to create CQRS/ES appliactions
Commanded Ecto Projections: Projections on an Ecto DB
Commanded EventStore Adapter: EventStore adapter for commanded using postgres

Using

Setup the databases with mix setup_db and then run iex -S mix

iex> Coins.mine_coin("me", 1)
{:error, :invalid_nonce}

iex> Coins.mine_coin("me", 190)
:ok

iex> Coins.mine_coin("me", 190)
{:error, :used_nonce}

iex> Coins.mine_coin("me", 443)
:ok

iex> Coins.richest |> Map.take([:account_id, :balance])
%{account_id: "me", balance: 1}

iex> [488, 1442, 1597] |> Enum.map(&(Coin.mine_coin("you" &1)))
[:ok, :ok, :ok]

iex> Coins.richest |> Map.take([:account_id, :balance])
%{account_id: "you", balance: 3}

iex> Coins.send_coins("you", "me", 99999)
{:error, :not_enough_coins}

iex> Coins.send_coins("you", "me", 3)
:ok

iex> Coins.richest |> Map.take([:account_id, :balance])
%{account_id: "me", balance: 5}

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ex-cbsf2018's Issues

== Compilation error in file lib/coins/send_coins_process.ex ==

Hi, first of all, thank you for your repo.

But, I'm struggling with this, when I try to use mix setup_db or mix reset_db I get the following error:

ompiling 12 files (.ex)
warning: unused alias Transfer
  lib/coins.ex:6


== Compilation error in file lib/coins/send_coins_process.ex ==
** (UndefinedFunctionError) function :elixir_errors.warn/1 is undefined or private. Did you mean one of:

      * warn/3

    (elixir) :elixir_errors.warn("Commanded Deprecation Warning:\nProcessmanager Elixir.Coins.SendCoinsProcess defined error/4 callback.\nThis is deprecated in favor of error/3\nSee https://github.com/commanded/commanded/blob/master/guides/Process%20Managers.md#deprecated-error4")
    (stdlib) erl_eval.erl:677: :erl_eval.do_apply/6
    /Users/yamildiazaguirre/Documents/freelance/rideqro/ex-cbsf2018/lib/coins/send_coins_process.ex:1: Commanded.ProcessManagers.ProcessManager.__before_compile__/1

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