I saw get_members_with_meta at https://github.com/ostinelli/syn/issues/7/1 method, why to the latest version, did not return this feature now
leeyisoft opened this issue · comments
I saw get_members_with_meta at #7 method, why to the latest version, did not return this feature now（ 3.3.0）
This method is very useful. Is there any other way to implement this requirement?
-spec get_members_with_meta(Name :: any()) -> [{pid(), any()}].
get_members_with_meta(Name) ->
i_get_members_with_meta(Name).
Preconditions:
Users can log in from multiple device types at the same time (e.g. on iOS, Android, MacOS, etc., one PID per device type).
Function implementation:
What I'm doing now is putting the Pids of multiple device logins into a group, and syn is perfect for that
Another feature, the user's device list, needs to show which devices are online.
前置条件：
用户可以同时用多中设备类型登录（比如同时在iOS 和 Android 还有MacOS 等设备上登录，每个设备类型一个PID）
功能实现：
我现在实现的功能是，把多个设备登录的PID放到一个group 里面，用syn 可以完美解决问题
还有另外一个功能，用户的设备列表，里面需要显示那些设备在线
In my IM project, this is my mnesia is used to implement this feature (https://github.com/imboy-pub/imboy/blob/main/src/chat_online.erl), I'm going to use https://github.com/ostinelli/syn to realize it
...
%%
% pid 进程ID
% uid 登录用户ID
% dtype 设备类型 web ios android macos windows等
% did 设备ID
-record(chat_online, {
pid,
uid,
dtype,
did
}).
...
%% [{chat_online,<0.1155.0>,<<"1">>,<<"iOS">>,<<"78ece1d4d7d346a1">>}]
-spec lookup(pid() | integer()) -> list().
lookup(Pid) when is_pid(Pid) ->
mnesia:dirty_read(chat_online, Pid);
lookup(UID) when is_integer(UID) ->
lookup(integer_to_binary(UID));
lookup(UID) when is_list(UID) ->
lookup(list_to_binary(UID));
lookup(UID) ->
mnesia:dirty_index_read(chat_online, UID, #chat_online.uid).
lookup(UID, DID) ->
[M1 || M1 <- lookup(UID), M1#chat_online.did =:= DID].
lookup_by_dtype(UID, Dtype) ->
[M1 || M1 <- lookup(UID), M1#chat_online.dtype =:= Dtype].
...
