feat: use ClassifiedAdTitle value object for ClassifiedAd.title

domain/marketplace/__init__.py

@@ -1,5 +1,6 @@
 from .classified_ad import ClassifiedAd as ClassifiedAd
 from .classified_ad_id import ClassifiedAdId as ClassifiedAdId
+from .classified_ad_title import ClassifiedAdTitle as ClassifiedAdTitle
 from .money import Money as Money
 from .price import Price as Price
 from .user_id import UserId as UserId

domain/marketplace/classified_ad.py

@@ -2,6 +2,7 @@ from dataclasses import dataclass, field
 from decimal import Decimal
 
 from domain.marketplace.classified_ad_id import ClassifiedAdId
+from domain.marketplace.classified_ad_title import ClassifiedAdTitle
 from domain.marketplace.price import Price
 from domain.marketplace.user_id import UserId
 
@@ -10,6 +11,6 @@ from domain.marketplace.user_id import UserId
 class ClassifiedAd:
     id: ClassifiedAdId
     _ownerId: UserId
-    title: str
+    title: ClassifiedAdTitle
     text: str
     price: Price = field(default_factory=lambda: Price(amount=Decimal("0.00")))

domain/marketplace/classified_ad_title.py

@@ -0,0 +1,10 @@
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class ClassifiedAdTitle:
+    title: str
+
+    def __post_init__(self):
+        if len(self.title) > 100:
+            raise ValueError(f"Title cannot be longer than 100 characters: {self.title}")