first chapter

main.py

@@ -1,30 +1,54 @@
 # example from root.cz
 # https://www.root.cz/clanky/validace-dat-v-pythonu-s-vyuzitim-knihovny-pydantic/
-
-from models.User import User, UserNone, UserUnion, UserPositiveInt, UserFieldValidator, UserMaxLength
+from models.address import Address
+from models.character import CharacterModel, CharacterModelOptionalAddress
+from models.user import User, UserNone, UserUnion, UserPositiveInt, UserFieldValidator, UserMaxLength
 
 
 def main():
+
+    # Basic validation
     print("Hello from pydantic-demo!")
-    print(f"{User(name="John", surname="Doe", age=42, registered=True)=}")
-    print(f"{User(name="Adam", surname="Bernau", age=52, registered=True)=}")
-    print(f"{UserNone(name="Adam", surname="Bernau", age=None)=}")
-    print(f"{UserUnion(name="Adam", surname="Bernau", age=None)=}")
-    print(f"{UserUnion(name="Adam", surname="Bernau")=}")
-    print(f"{UserPositiveInt(name="Adam", surname="Bernau")=}")
-    #print(f"{UserPositiveInt(name="Adam", surname="Bernau", age=-50)=}")
-    print(f"{UserFieldValidator(name="Adam", surname="Bernau", age=18)=}")
-    print(f"{UserMaxLength(name="Adam", surname="Bernau", age=18)=}")
-    #print(f"{UserMaxLength(name="Adam", surname="Bernaukjghsmtlmgchs", age=18)=}")
+    print(f"{User(name='John', surname='Doe', age=42, registered=True)=}")
+    print(f"{User(name='Adam', surname='Kameník', age=52, registered=True)=}")
+    print(f"{UserNone(name='Tomáš', surname='Macek', age=None)=}") # preferred variant
+    print(f"{UserUnion(name='Adam', surname='Bernau', age=None)=}")
+    print(f"{UserUnion(name='Adam', surname='Bernau')=}")
+    print(f"{UserPositiveInt(name='Adam', surname='Bernau')=}")
+    #print(f"{UserPositiveInt(name="Adam', surname='Bernau', age=-50)=}")
+    print(f"{UserFieldValidator(name='Adam', surname='Bernau', age=18)=}")
+    print(f"{UserMaxLength(name='Adam', surname='Bernau', age=18)=}")
+    #print(f"{UserMaxLength(name='Adam', surname='Bernaukjghsmtlmgchs', age=18)=}")
 
     # JSON
     data = """
-        {"name": "John",
-         "surname": "Doe",
-         "age": 18
+        {"name": "Marek",
+         "surname": "Kdolský",
+         "age": 50
         }
     """
-    print(f"{UserMaxLength.model_validate_json(data)=}")
+    user1 = UserMaxLength.model_validate_json(data)
+    print(f"{user1=}")
+    print(f"{user1.model_dump_json()=}")
+    print(user1.model_dump_json(indent=4))
+
+    # Nested structure and JSON
+    character = CharacterModel(
+        role='Director',
+        user=User(name='John', surname='Doe', age=42, registered=True),
+        address=Address(street='Dlouhá', house_number=77, city='Prague'),
+    )
+    print(f"{character=}")
+    print(character.model_dump_json(indent=4))
+
+
+    character1 = CharacterModelOptionalAddress(
+        role='Director',
+        user=UserFieldValidator(name='John', surname='Doe', age=19, registered=True),
+        # address=Address(street='Dlouhá', house_number=77, city='Prague'),
+        )
+    print(f"Optional address {character1=}")
+    print(character1.model_dump_json(indent=4))
 
 if __name__ == "__main__":
     main()