简单Elixir游戏服设计-创建玩家模型

删除model.ex

创建玩家模型 player.ex， 简单化，只有唯一标识，昵称，金币，够用了。

选择 map 代表数据，是为了扩展数据结构，方便增加功能。struct也是可以的。

add_num 和 cost_num 存粹是为了简化代码

一系列的get/set 是为了操作玩家数据用的（也可以减少代码吧）

defmodule Player do
    def init do
        %{
            id: 0,     # 唯一标识
            name: "",   # 昵称
            gold: 0,     # 金币
        }
    end

    def get_id(player), do: player.id
    def set_id(player, new_id), do: put_in(player.id, new_id)

    def set_name(player, new_name), do: put_in(player.name, new_name)
    def get_name(player), do: player.name


    def add(num) when num >=0 , do: &(&1 + num)
    def cost(num) when num >=0 , do: &(&1 - num)

    def get_gold(player), do: player.gold
    def add_gold(player, num) , do: update_in(player.gold, add(num))
    def cost_gold(player, num), do: update_in(player.gold, cost(num))
end

增加player 的测试  player_test.ex

defmodule PlayerTest do
  use ExUnit.Case
  doctest Player
  
  setup do

    %{player: Player.init}
  end

  test "设置ID", %{player: player} do
      set_id = "test"
      new_id = player |> Player.set_id(set_id) |> Player.get_id
      assert new_id == set_id
  end

  test "设置昵称", %{player: player} do
      set_name = "新名字"
      new_name= player |> Player.set_name(set_name) |> Player.get_name
      assert new_name == set_name
  end

  test "增加金币", %{player: player} do
      num = 10
    new_gold =  player |> Player.add_gold(num) |> Player.get_gold
    old_gold = player |> Player.get_gold
    assert new_gold == old_gold + num
  end

  test "减少金币", %{player: player} do
      num = 10
      new_gold = player |> Player.cost_gold(num) |> Player.get_gold
      old_gold = player |> Player.get_gold
      assert new_gold == old_gold - num
  end
end

我用的sublime，安装elixr包，然后tools ==》 build system ==》 elixr mix test

ctrl + B 就可以测试了。