[update]: model class methods

app/models/account.py

@@ -22,6 +22,15 @@ class Account(db.Model):
     #     viewonly=True
     # )
 
+    @classmethod
+    def is_valid_account(cls, account_id, customer_id):
+        account = cls.query.filter_by(id=account_id, customer_id=customer_id).first()
+        if not account:
+            return False, "Account not found or doesn't belong to customer"
+        if account.lien_amount > 0:
+            return False, "Account has an existing lien"
+        return True, "Account is valid"
+
     def __repr__(self):
         return f'<Account {self.id}>'
     

app/models/customer.py

@@ -11,6 +11,13 @@ class Customer(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.utcnow)
     updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
+    @classmethod
+    def is_eligible(cls, customer_id):
+        customer = cls.query.filter_by(id=customer_id).first()
+        if not customer:
+            return False, "Customer not found"
+        return True, "Customer is eligible"
 
     def __repr__(self):
-        return f'<Customer {self.id}>'
+        return f'<Customer {self.id}>'
+    

app/models/loan.py

@@ -15,5 +15,18 @@ class Loan(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.utcnow)
     updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
+
+    @classmethod
+    def has_active_loans(cls, customer_id):
+        active_loans = cls.query.filter_by(
+            customer_id=customer_id,
+            status='active'
+        ).count()
+
+        if active_loans > 0:
+            return False, "Customer has active loans"
+        return True, "No active loans"
+    
+    
     def __repr__(self):
         return f'<Loan {self.id}>'