add a check for rule types

src/finam/sdk/component.py

@@ -281,7 +281,7 @@ class Component(IComponent, Loggable, ABC):
                 }
             )
 
-        The :class:`.Info` object for output ``Out`` will be crated and pushed automatically in :meth:`.try_connect`
+        The :class:`.Info` object for output ``Out`` will be created and pushed automatically in :meth:`.try_connect`
         as soon as the metadata for ``In`` becomes available.
 
         Here, the metadata of an output is composed from the metadata of two inputs and a user-defined value:

src/finam/tools/connect_helper.py

@@ -174,13 +174,20 @@ class ConnectHelper(Loggable):
                 self._check_rule(rule)
 
     def _check_rule(self, rule):
-        if isinstance(rule, FromInput) and rule.name not in self._inputs:
-            raise KeyError(
-                f"No input named '{rule.name}' to use in info transfer rule."
-            )
-        if isinstance(rule, FromOutput) and rule.name not in self._outputs:
-            raise KeyError(
-                f"No output named '{rule.name}' to use in info transfer rule."
+        if isinstance(rule, FromInput):
+            if rule.name not in self._inputs:
+                raise KeyError(
+                    f"No input named '{rule.name}' to use in info transfer rule."
+                )
+        elif isinstance(rule, FromOutput):
+            if rule.name not in self._outputs:
+                raise KeyError(
+                    f"No output named '{rule.name}' to use in info transfer rule."
+                )
+        elif not isinstance(rule, FromValue):
+            raise TypeError(
+                f"Rules must be one of the types FromInput, FromOutput or FromValue. "
+                f"Got '{rule.__class__.__name__}'."
             )
 
     @property

tests/tools/test_connect.py

@@ -358,3 +358,11 @@ class TestConnectHelper(unittest.TestCase):
                 outputs,
                 in_info_rules={"In1": [FromOutput("OutX", "grid")]},
             )
+
+        with self.assertRaises(TypeError):
+            _connector: ConnectHelper = ConnectHelper(
+                "TestLogger",
+                inputs,
+                outputs,
+                in_info_rules={"In1": [0]},
+            )