Optimize columns loading: lazy create row locator

Author: Reskov

src/gino/crud.py

@@ -87,9 +87,9 @@ def __init__(self, instance: "CRUDModel"):
         self._props = {}
         self._literal = True
         self._locator = None
-        if instance.__table__ is not None:
+        if self._instance.__table__ is not None:
             try:
-                self._locator = instance.lookup()
+                self._locator = self._instance.lookup()
             except LookupError:
                 # apply() will fail anyway, but still allow update()
                 pass
@@ -435,7 +435,8 @@ class CRUDModel(Model):
     def __init__(self, **values):
         super().__init__()
         self.__profile__ = None
-        self._update_request_cls(self).update(**values)
+        if values:
+            self._update_request_cls(self).update(**values)
 
     @classmethod
     def _init_table(cls, sub_cls):