Added fields serializer for LinkPreviewOptions

CHANGES/1450.bugfix.rst

@@ -0,0 +1 @@
+fixed json serialization, deserialization for Message

aiogram/types/link_preview_options.py

@@ -1,5 +1,7 @@
 from typing import TYPE_CHECKING, Any, Optional, Union
 
+from pydantic import field_serializer, field_validator
+
 from ..client.default import Default
 from .base import TelegramObject
 
@@ -22,6 +24,35 @@ class LinkPreviewOptions(TelegramObject):
     show_above_text: Optional[Union[bool, Default]] = Default("link_preview_show_above_text")
     """*Optional*. :code:`True`, if the link preview must be shown above the message text; otherwise, the link preview will be shown below the message text"""
 
+    @field_serializer(
+        "is_disabled",
+        "prefer_small_media",
+        "prefer_large_media",
+        "show_above_text",
+        when_used="json",
+    )
+    def serialize_fields(self, value: Union[bool, Default]) -> str:
+        if isinstance(value, bool):
+            return str(value)
+        else:
+            return value.name
+
+    @classmethod
+    @field_validator(
+        "is_disabled",
+        "prefer_small_media",
+        "prefer_large_media",
+        "show_above_text",
+        mode="before",
+    )
+    def deserialize_fields(cls, value: str) -> Union[bool, Default]:
+        if value == "True":
+            return True
+        elif value == "False":
+            return False
+        else:
+            return Default(value)
+
     if TYPE_CHECKING:
         # DO NOT EDIT MANUALLY!!!
         # This section was auto-generated via `butcher`