ENH: Resetable Funcified Methods

rocketpy/Function.py

@@ -2916,8 +2916,8 @@ def calcOutput(func, inputs):
 
 
 def funcify_method(*args, **kwargs):
-    """Decorator factory to wrap methods as Function objects and save them as cached
-    properties.
+    """Decorator factory to wrap methods as Function objects and save them as
+    cached properties.
 
     Parameters
     ----------
@@ -2952,8 +2952,8 @@ def funcify_method(*args, **kwargs):
     >>> g(2)
     11
 
-    2. Method which returns a rocketpy.Function instance. An interesting use is to reset
-    input and output names after algebraic operations.
+    2. Method which returns a rocketpy.Function instance. An interesting use is
+    to reset input and output names after algebraic operations.
 
     >>> class Example():
     ...     @funcify_method(inputs=['x'], outputs=['x**3'])
@@ -3025,6 +3025,7 @@ def __get__(self, instance, owner=None):
                     )
 
                 val.__doc__ = self.__doc__
+                val.__cached__ = True
                 cache[self.attrname] = val
             return val
 
@@ -3034,6 +3035,27 @@ def __get__(self, instance, owner=None):
         return funcify_method_decorator
 
 
+def reset_funcified_methods(instance):
+    """Resets all the funcified methods of the instance. It does so by
+    deleting the current Functions, which will make the interperter redefine
+    them when they are called. This is useful when the instance has changed
+    and the methods need to be recalculated.
+
+    Parameters
+    ----------
+    instance : object
+        The instance of the class whose funcified methods will be recalculated.
+        The class must have a mutable __dict__ attribute.
+
+    Return
+    ------
+    None
+    """
+    for key in list(instance.__dict__):
+        if hasattr(instance.__dict__[key], "__cached__"):
+            instance.__dict__.pop(key)
+
+
 if __name__ == "__main__":
     import doctest
 

rocketpy/motors/HybridMotor.py

@@ -9,7 +9,8 @@
 except ImportError:
     from rocketpy.tools import cached_property
 
-from rocketpy.Function import funcify_method
+
+from rocketpy.Function import funcify_method, reset_funcified_methods
 
 from .LiquidMotor import LiquidMotor
 from .Motor import Motor
@@ -531,6 +532,7 @@ def addTank(self, tank, position):
         """
         self.liquid.addTank(tank, position)
         self.solid.massFlowRate = self.totalMassFlowRate - self.liquid.massFlowRate
+        reset_funcified_methods(self)
 
     def allInfo(self):
         """Prints out all data and graphs available about the Motor.

rocketpy/motors/LiquidMotor.py

@@ -9,7 +9,7 @@
 except ImportError:
     from rocketpy.tools import cached_property
 
-from rocketpy.Function import Function, funcify_method
+from rocketpy.Function import Function, funcify_method, reset_funcified_methods
 
 from .Motor import Motor
 
@@ -429,6 +429,7 @@ def addTank(self, tank, position):
             geometry reference zero point.
         """
         self.positioned_tanks.append({"tank": tank, "position": position})
+        reset_funcified_methods(self)
 
     def allInfo(self):
         """Prints out all data and graphs available about the Motor.

rocketpy/motors/SolidMotor.py

@@ -12,7 +12,7 @@
 except ImportError:
     from rocketpy.tools import cached_property
 
-from rocketpy.Function import Function, funcify_method
+from rocketpy.Function import Function, funcify_method, reset_funcified_methods
 
 from .Motor import Motor
 
@@ -511,6 +511,8 @@ def terminateBurn(t, y):
             "constant",
         )
 
+        reset_funcified_methods(self)
+
         return [self.grainInnerRadius, self.grainHeight]
 
     @funcify_method("Time (s)", "burn area (m²)")