[add]: loan_repayment event

app/models/loan.py

@@ -26,6 +26,16 @@ class Loan(db.Model):
             return False, "Customer has active loans"
         return True, "No active loans"
     
+    @classmethod
+    def get_customer_loan(cls, loan_id, customer_id):
+        """
+        Check if a loan with the given ID exists and if the loan belongs to the specified customer_id.
+        """
+        loan = cls.query.filter_by(id=loan_id, customer_id=customer_id).first()
+        if not loan:
+            raise ValueError(f"Loan with ID {loan_id} does not exist or does not belong to customer {customer_id}.")
+        return loan
+    
     
     def __repr__(self):
         return f'<Loan {self.id}>'

app/models/repayment.py

@@ -0,0 +1,45 @@
+from datetime import datetime, timezone
+from app.extensions import db
+from app.models.customer import Customer
+from app.models.loan import Loan
+
+
+class Repayment(db.Model):
+    __tablename__ = 'repayments'
+
+    id = db.Column(
+        db.Integer,
+        primary_key=True,
+        autoincrement=True,
+    )
+    loan_id = db.Column(db.String(50), nullable=False)
+    customer_id = db.Column(db.String(50), nullable=False)
+    product_id = db.Column(db.String(20), nullable=True)
+    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 create_repayment(cls, customer_id, loan_id, product_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)
+        if not loan:
+            raise ValueError("Loan not found for customer")
+
+        repayment = cls(
+            customer_id=customer_id,
+            loan_id=loan.id,
+            product_id=product_id,
+        )
+
+        db.session.add(repayment)
+        db.session.commit()
+        return repayment
+
+    def __repr__(self):
+        return f'<Repayment {self.id}>'