Use cls as first classmethod argument (Fix: N804) (#939)

nornir/core/inventory.py

@@ -79,7 +79,7 @@ def __init__(
         )
 
     @classmethod
-    def schema(self) -> Dict[str, Any]:
+    def schema(cls) -> Dict[str, Any]:
         return {
             "extras": {"$key": "$value"},
             **super().schema(),
@@ -138,7 +138,7 @@ def __init__(
         )
 
     @classmethod
-    def schema(self) -> Dict[str, Any]:
+    def schema(cls) -> Dict[str, Any]:
         return {
             "groups": ["$group_name"],
             "data": {"$key": "$value"},
@@ -218,7 +218,7 @@ def __init__(
         )
 
     @classmethod
-    def schema(self) -> Dict[str, Any]:
+    def schema(cls) -> Dict[str, Any]:
         return {
             "data": {"$key": "$value"},
             "connection_options": {"$connection_type": ConnectionOptions.schema()},

pyproject.toml

@@ -141,7 +141,6 @@ ignore = [
     "FBT002",  # Boolean default positional argument in function definition
     "FURB101", # `open` and `read` should be replaced by `Path(filename).read_text()`
     "INP001",  # File is part of an implicit namespace package. Add an `__init__.py`.
-    "N804",    # First argument of a class method should be named `cls`
     "PERF203", # `try`-`except` within a loop incurs performance overhead
     "PGH004",  # Use specific rule codes when using `noqa`
     "PIE800",  # Unnecessary spread `**`