Question

在Elixir中，我有这张地图

   my_map =  [%{ user_id: 1, user_name: "David", gamer_id: 100, gamer_name: "John"  },
    %{ user_id: 1, user_name: "David", gamer_id: 101, gamer_name: "Bil"  },
    %{ user_id: 1, user_name: "David", gamer_id: 103, gamer_name: "Ruk"  },
    %{ user_id: 2, user_name: "Ron", gamer_id: 104, gamer_name: "Sam"  },
    %{ user_id: 2, user_name: "Ron", gamer_id: 105, gamer_name: "Sean"  }]

我想将其转换为以下输出

输出：

[%{ user_id: 1, username: "David", 
    games: [
        %{
            gamer_id: 100,
            gamer_name: "John"
        },
        %{
            gamer_id: 101,
            gamer_name: "Bil"
        },
        %{
            gamer_id: 103,
            gamer_name: "Ruk"
        }
    ]
},
%{ user_id: 2, username: "Ron", 
    games: [
        %{
            gamer_id: 104,
            gamer_name: "Sam"
        },
        %{
            gamer_id: 105,
            gamer_name: "Sean"
        }
    ]
}]

我尝试了Enum.group_by，但全部都无法实现

my_map |> Enum.group_by（fn（x）-> x.user_id结尾）

任何对实现这一目标的见识将不胜感激。

Answer 1

您可以使用<UserControl d:DesignHeight="450" d:DesignWidth="794"> <DockPanel DataContext="{Binding Model1}"> <GroupBox Header="{concept:Intl Key=Geometry, DefaultText='G1'}" DockPanel.Dock="Top" MinHeight="165"> <Grid> // Common view </Grid> </GroupBox> <GroupBox DockPanel.Dock="Bottom" Header="{concept:Intl Key=G2, DefaultText='G2'}" DataContext="{Binding G2}" Padding="0,10"> <Grid> // other stuff </Grid> </GroupBox> </DockPanel>的第三个参数来提取git revert {commit_id}和Enum.group_by，然后使用gamer_id进行一些处理：

gamer_name

输出：

Enum.map

Elixir Map-分组依据和顺序字段

1 个答案: