change how config inheriting works

Author: leafo

pgmoon/init.lua

@@ -883,14 +883,20 @@ do
   }
   _base_0.__index = _base_0
   _class_0 = setmetatable({
-    __init = function(self, config)
-      if config == nil then
-        config = { }
-      end
-      self.config = config
-      assert(not getmetatable(self.config), "options argument must not have a metatable to allow default configuration to be inherited")
-      setmetatable(self.config, {
-        __index = self.default_config
+    __init = function(self, _config)
+      if _config == nil then
+        _config = { }
+      end
+      self._config = _config
+      self.config = setmetatable({ }, {
+        __index = function(t, key)
+          local value = self._config[key]
+          if value == nil then
+            return self.default_config[key]
+          else
+            return value
+          end
+        end
       })
       self.sock, self.sock_type = socket.new(self.config.socket_type)
     end,

pgmoon/init.moon

@@ -171,11 +171,15 @@ class Postgres
   -- ssl_verify: verify the certificate
   -- cqueues_openssl_context: manually created openssl.ssl.context for cqueues sockets
   -- luasec_opts: manually created options for LuaSocket ssl connections
-  new: (@config={}) =>
-    assert not getmetatable(@config),
-      "options argument must not have a metatable to allow default configuration to be inherited"
-
-    setmetatable @config, __index: @default_config
+  new: (@_config={}) =>
+    @config = setmetatable {}, {
+      __index: (t, key) ->
+        value = @_config[key]
+        if value == nil
+          @default_config[key]
+        else
+          value
+    }
 
     @sock, @sock_type = socket.new @config.socket_type