add real enum support for mysql/mariadb

CHANGELOG.rst

@@ -11,6 +11,10 @@ Changelog
 
 0.25.0 (unreleased)
 ------
+Added
+^^^^^
+- Added MySQL-specific ENUM type support for CharEnumField (#1883)
+
 Fixed
 ^^^^^
 - Fixed asyncio "no current event loop" deprecation warning by replacing `asyncio.get_event_loop()` with modern event loop handling using `get_running_loop()` with fallback to `new_event_loop()` (#1865)

tortoise/fields/data.py

@@ -13,6 +13,7 @@
 from pypika_tortoise.terms import Term
 
 from tortoise import timezone
+from tortoise.converters import escape_str
 from tortoise.exceptions import ConfigurationError, FieldError
 from tortoise.fields.base import Field
 from tortoise.timezone import get_default_timezone, get_timezone, get_use_tz, localtime
@@ -761,6 +762,15 @@ def __init__(
         super().__init__(description=description, max_length=max_length, **kwargs)
         self.enum_type = enum_type
 
+    class _db_mysql:
+        def __init__(self, field: "CharEnumFieldInstance") -> None:
+            self.field = field
+
+        @property
+        def SQL_TYPE(self) -> str:
+            enum_values = ", ".join(escape_str(e.value) for e in self.field.enum_type)
+            return f"ENUM({enum_values})"
+
     def to_python_value(self, value: Union[str, None]) -> Union[Enum, None]:
         return self.enum_type(value) if value is not None else None