Implement work around to partially intitialise pydantic class variabl…

…es to allow setting of self when setting _delayed_kwargs:O

rocketry/tasks/func.py

@@ -5,7 +5,7 @@
 from typing import Callable, List, Optional
 import warnings
 
-from pydantic import Field, PrivateAttr, field_validator, field_serializer
+from pydantic import Field, PrivateAttr, field_validator, field_serializer, BaseModel
 
 from rocketry.core.task import Task
 from rocketry.core.parameters import Parameters
@@ -128,7 +128,7 @@ def wrapper(*args, **kwargs):
         def my_task_func():
             ...
     """
-    func: Optional[Callable] = Field(description="Executed function")
+    func: Optional[Callable] = Field(description="Executed function", default=None)
 
     path: Optional[Path] = Field(description="Path to the script that is executed", default = None)
     func_name: Optional[str] = Field(default="main", description="Name of the function in given path. Pass path as well")
@@ -171,6 +171,9 @@ def ser_func(self, func):
     def __init__(self, func=None, **kwargs):
         only_func_set = func is not None and not kwargs
         no_func_set = func is None and kwargs.get('path') is None
+        from pydantic.main import _object_setattr
+        _object_setattr(self, "__pydantic_extra__", {})
+        _object_setattr(self, "__pydantic_private__", None)
         if no_func_set:
             # FuncTask was probably called like:
             # @FuncTask(...)
@@ -179,7 +182,7 @@ def __init__(self, func=None, **kwargs):
             # We initiate the class lazily by creating
             # almost empty shell class that is populated
             # in next __call__ (which should occur immediately)
-            FuncTask._delayed_kwargs = kwargs
+            self._delayed_kwargs = kwargs
             return
         if only_func_set:
             # Most likely called as:
@@ -199,7 +202,7 @@ def __call__(self, *args, **kwargs):
             func = args[0]
             super().__init__(func=func, **self._delayed_kwargs)
             self._set_descr(is_delayed=False)
-            FuncTask._delayed_kwargs = {}
+            self._delayed_kwargs = {}
 
             # Note that we must return the function or
             # we are in deep shit with multiprocessing