Upgrade to pydanticv2 (#63)

* Upgrade to Pydantic 2 #15

* update examples to use pydantic2

---------

Co-authored-by: Mike Harris <mharris717@gmail.com>

examples/recursive_filepaths/parse_recursive_paths.py

@@ -1,45 +1,3 @@
-"""
-This script parses a string representation of a filesystem structure into a tree-like directory structure.
-
-The 'Node' class represents a node in this tree, which can be either a file or a folder. Files cannot have 
-children, while folders can.
-
-The 'DirectoryTree' class contains a single root folder from which all other files/folders can be reached.
-The 'parse_tree_to_filesystem' function uses OpenAI's GPT-3 model to convert a string representation of a 
-directory tree into a 'DirectoryTree' object. This object can then be manipulated programmatically as needed,
-with methods such as 'print_paths' available for convenience.
-
-Please note: Recursive models currently work if they are wrapped by a non-recursive one. This is why we are
-passing a 'DirectoryTree' (which contains a single 'Node') as the function call, not a 'Node' directly. This
-is due to a limitation in how Pydantic generates schemas for recursive objects, which creates 
-'dict_keys(['$ref', 'definitions'])'. Instead of writing a resolver for such references, we can simply wrap the 
-recursive class in a non-recursive one so the function_call class never has a cyclic reference.
-
-Example usage:
->>> root = parse_tree_to_filesystem(
-...     '''
-...     root
-...     ├── folder1
-...     │   ├── file1.txt
-...     │   └── file2.txt
-...     └── folder2
-...         ├── file3.txt
-...         └── subfolder1
-...             └── file4.txt
-...     '''
-... )
->>> root.print_paths()
-# Expected output:
-# >>> root                                  NodeType.FOLDER
-# >>> root/folder1                          NodeType.FOLDER
-# >>> root/folder1/file1.txt                NodeType.FILE
-# >>> root/folder1/file2.txt                NodeType.FILE
-# >>> root/folder2                          NodeType.FOLDER
-# >>> root/folder2/file3.txt                NodeType.FILE
-# >>> root/folder2/subfolder1               NodeType.FOLDER
-# >>> root/folder2/subfolder1/file4.txt     NodeType.FILE
-"""
-
 import enum
 from typing import List
 
@@ -115,8 +73,8 @@ class DirectoryTree(OpenAISchema):
         self.root.print_paths()
 
 
-Node.update_forward_refs()
-DirectoryTree.update_forward_refs()
+Node.model_rebuild()
+DirectoryTree.model_rebuild()
 
 
 @retry(stop=stop_after_attempt(3))