Implement auto-trim char field

bot/common/model_fields.py

@@ -67,3 +67,17 @@ def deconstruct(self) -> typing.Tuple[str, str, typing.Any, typing.Any]:
         name, path, args, kwargs = super().deconstruct()
         kwargs['enum'] = self.enum
         return name, path, args, kwargs
+
+
+class CustomCharField(models.CharField):
+    def __init__(self, *args, **kwargs) -> None:
+        self.auto_trim = kwargs.pop('auto_trim', False)
+        super().__init__(*args, **kwargs)
+
+    def get_prep_value(self, value: str) -> str:
+        value = super().get_prep_value(value)
+
+        if self.auto_trim is True and len(value) > self.max_length:
+            return value[: self.max_length]
+
+        return value

bot/models/server.py

@@ -147,10 +147,11 @@ class Post(models.Model):
         null=True,
         default=None,
     )
-    description = models.CharField(
+    description = model_fields.CustomCharField(
         max_length=2000,
         null=True,
         default=None,
+        auto_trim=True,
     )
     views = models.BigIntegerField(
         null=True,