我有message = %{"to" => "testuser", "value" => "asdads"}地图.我需要访问此地图中"to"键的值
message.to
message[:to]
Map.fetch!(message, to)
到目前为止没什么用
这是控制台错误消息
[error] GenServer #PID<0.395.0> terminating
** (KeyError) key :to not found in: %{"to" => "testuser", "value" => "aadadadad"}
(phoenix_chat) web/channels/room_channel.ex:31: PhoenixChat.RoomChannel.handle_in/3
(phoenix) lib/phoenix/channel/server.ex:225: anonymous fn/4 in Phoenix.Channel.Server.handle_info/2
(stdlib) gen_server.erl:601: :gen_server.try_dispatch/4
(stdlib) gen_server.erl:667: :gen_server.handle_msg/5
(stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: %Phoenix.Socket.Message{event: "message:new", payload: %{"to" => "testuser", "value" => "aadadadad"}, ref: "4", topic: "room:Pamidu"}
State: %Phoenix.Socket{assigns: %{user: "Pamidu"}, channel: PhoenixChat.RoomChannel, channel_pid: #PID<0.395.0>, endpoint: PhoenixChat.Endpoint, handler: PhoenixChat.UserSocket, id: nil, …