Remove not needed properties

Author: FBumann

flixopt/elements.py

@@ -486,20 +486,6 @@ def size_is_fixed(self) -> bool:
         # Wenn kein InvestParameters existiert --> True; Wenn Investparameter, den Wert davon nehmen
         return False if (isinstance(self.size, InvestParameters) and self.size.fixed_size is None) else True
 
-    @property
-    def invest_is_optional(self) -> bool:
-        # Wenn kein InvestParameters existiert: # Investment ist nicht optional -> Keine Variable --> False
-        warnings.warn(
-            "The 'invest_is_optional' property is deprecated. Use 'invest_is_mandatory' instead.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        return False if (isinstance(self.size, InvestParameters) and self.size.mandatory) else True
-
-    @property
-    def invest_is_mandatory(self) -> bool:
-        return False if (isinstance(self.size, InvestParameters) and not self.size.mandatory) else True
-
 
 class FlowModel(ElementModel):
     def __init__(self, model: SystemModel, element: Flow):