[add]: Charges

app/models/offer.py

@@ -1,5 +1,6 @@
 from datetime import datetime, timezone
 from app.extensions import db
+from app.models.charge import Charge
 
 class Offer(db.Model):
     __tablename__ = 'offers'
@@ -12,6 +13,13 @@ class Offer(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.now(timezone.utc))
     updated_at = db.Column(db.DateTime, default=datetime.now(timezone.utc), onupdate=datetime.now(timezone.utc))
 
+    charges = relationship(
+        "Charge",
+        primaryjoin="Offer.id == Charge.offer_id",
+        foreign_keys="Charge.offer_id",
+        back_populates="offer",
+    )
+
     @classmethod
     def get_all_offers(cls):
         """