[add]: loan ref to repayment

app/models/customer.py

@@ -48,6 +48,8 @@ class Customer(db.Model):
     def create_customer(cls, id, msisdn, country_code, account_id, account_type='savings'):
         if cls.query.filter_by(id=id).first():
             raise ValueError("Customer already exists")
+        elif Account.query.filter_by(id=account_id).first():
+            raise ValueError("Account already exists")
         
         # Create the customer
         customer = cls(

app/models/repayment.py

@@ -23,15 +23,7 @@ class Repayment(db.Model):
     transaction_id = db.Column(db.String(50), nullable=True)
 
     @classmethod
-    def create_repayment(cls, customer_id, loan_id, product_id, transaction_id):
-
-
-        # Check customer exists
-        if not Customer.is_valid_customer(customer_id):
-            raise ValueError("Invalid customer")
-
-        # Check loan exists
-        loan = Loan.get_customer_loan(loan_id = loan_id, customer_id = customer_id)
+    def create_repayment(cls, customer_id, loan, transaction_id):
         
         # Check that the loan is active
         if loan.status not in [LoanStatus.ACTIVE, LoanStatus.START_REPAY]:
@@ -40,8 +32,8 @@ class Repayment(db.Model):
 
         repayment = cls(
             customer_id=customer_id,
-            loan_id=loan_id,
-            product_id=product_id,
+            loan_id=loan.id,
+            product_id=loan.product_id,
             transaction_id = transaction_id,
             created_at=datetime.now(timezone.utc),
             updated_at=datetime.now(timezone.utc)