Access to luaL_getmetatable

[PolEpie]

Hi, i would like access to luaL_getmetatable to retrieve my metatable id but it get me this
thread '<unnamed>' panicked at 'Failed to find symbol "luaL_getmetatable "

I've seen that luaL_newmetatable is already implemented so it should be easy to do

[WilliamVenner]

Hey, luaL_getmetatable isn't actually a function, it's a macro, as defined here: https://github.com/LuaJIT/LuaJIT/blob/505e2c03de35e2718eef0d2d3660712e06dadf1f/src/lauxlib.h#L118

You'll just have to use lua.get_field(LUA_REGISTRYINDEX, foo) where foo is the metatable id :)

[PolEpie]

But how can i get the metatable id since lua.new_metatable(lua_string!("MongoDBCollection")); return just a bool

[WilliamVenner]

lua_string!("MongoDBCollection") should work as metatable id

[PolEpie]

Ahah thx you saved me, and last question how can i push lua.new_userdata ? cause i'm just calling it and it give me attempt to index a nil value

[PolEpie]

My issue is more when define metatable, i've use that but doesnt seem to work, could you help me a little bit cause with that when i'm running getmetatable("MongoDBCollection) it return just __index

if lua.is_nil(-1) {
    lua.pop();
    lua.new_table();
}

lua.new_metatable(lua_string!("MongoDBCollection"));

lua.push_value(-1);

//lua.get_field(-1, lua_string!("MongoDBCollection"));
lua.set_field(-2, lua_string!("__index"));

lua.push_function(mongodb_database);
lua.set_field(-2, lua_string!("database"));