Fix creating ConsumptionType model

piket_client/model.py

@@ -133,7 +133,7 @@ class ConsumptionType(NamedTuple):
     consumption_type_id: int = None
     icon: str = None
 
-    def create(self) -> "Person":
+    def create(self) -> "ConsumptionType":
         """ Create a new ConsumptionType from the current attributes. As tuples
         are immutable, a new ConsumptionType with the correct id is returned.
         """
@@ -158,7 +158,7 @@ class ConsumptionType(NamedTuple):
             )
             return None
 
-        return Person.from_dict(data["consumption_type"])
+        return ConsumptionType.from_dict(data["consumption_type"])
 
     @classmethod
     def get(cls, consumption_type_id: int) -> "ConsumptionType":
@@ -215,7 +215,7 @@ class ConsumptionType(NamedTuple):
     @classmethod
     def from_dict(cls, data: dict) -> "ConsumptionType":
         """ Reconstruct a ConsumptionType from a dict. """
-        return ConsumptionType(
+        return cls(
             name=data["name"],
             consumption_type_id=data["consumption_type_id"],
             icon=data.get("icon"),