[add]: loan charges and offers. Fix RACCheck

app/models/offer.py

@@ -12,6 +12,26 @@ 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))
 
+    @classmethod
+    def get_all_offers(cls):
+        """
+        Return all offers in dictionary format.
+        """
+        offers = cls.query.all()
+
+        if not offers:
+            raise ValueError(f"No available offers")        
+        return offers
+    
+    @classmethod
+    def is_valid_offer(cls, offer_id):
+        offer = cls.query.filter_by(id=str(offer_id)).first()
+
+
+        if not offer:
+            return False
+        return offer
+    
     def to_dict(self):
         return {
             "offerId": self.id,