Azeez Muibi
188 lines
6.4 KiB
Python
188 lines
6.4 KiB
Python
from datetime import datetime, timezone
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from app.extensions import db
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from app.models.customer import Customer
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from app.models.account import Account
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from sqlalchemy.exc import IntegrityError
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from sqlalchemy.orm import relationship
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from sqlalchemy import and_, or_, not_
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from app.models import Customer
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class Loan(db.Model):
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__tablename__ = 'loans'
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id = db.Column(
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db.Integer,
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primary_key=True,
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autoincrement=True,
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)
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customer_id = db.Column(db.String(50), nullable=False)
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account_id = db.Column(db.String(50), nullable=False)
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offer_id = db.Column(db.String(20), nullable=False)
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initial_loan_amount = db.Column(db.Float, nullable=False)
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status = db.Column(db.String(20), default='pending')
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created_at = db.Column(db.DateTime, default=datetime.now(timezone.utc))
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updated_at = db.Column(db.DateTime, default=datetime.now(timezone.utc), onupdate=datetime.now(timezone.utc))
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product_id = db.Column(db.String(20))
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current_loan_amount = db.Column(db.Float)
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default_penalty_fee = db.Column(db.Float)
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continuous_fee = db.Column(db.Float)
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due_date = db.Column(db.DateTime)
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customer = relationship(
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"Customer",
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primaryjoin="Customer.id == Loan.customer_id",
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foreign_keys=[customer_id],
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back_populates="loans",
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)
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@classmethod
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def create_loan(cls, customer_id, account_id, offer_id, initial_loan_amount, status='pending',
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product_id=None, current_loan_amount=None, default_penalty_fee=None,
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continuous_fee=None, due_date=None):
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# Check if customer exists
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is_valid = Customer.is_valid_customer(customer_id)
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if not is_valid:
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raise ValueError("Customer does not exist")
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# # Check for active loans
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# has_active_loans = cls.has_active_loans(customer_id)
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# if has_active_loans:
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# raise ValueError("Customer has active loans")
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# Create and save the loan
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loan = cls(
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customer_id=customer_id,
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account_id=account_id,
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offer_id=offer_id,
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initial_loan_amount=initial_loan_amount,
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status=status,
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product_id=product_id,
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current_loan_amount=current_loan_amount or initial_loan_amount,
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default_penalty_fee=default_penalty_fee,
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continuous_fee=continuous_fee,
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due_date=due_date
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)
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try:
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db.session.add(loan)
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except IntegrityError as err:
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raise ValueError(f"Database integrity error: {err}")
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return loan
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@classmethod
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def has_active_loans(cls, customer_id):
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active_loans = cls.query.filter_by(
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customer_id=customer_id,
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status='active'
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).count()
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if active_loans > 0:
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return False
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return True
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@classmethod
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def get_customer_loan(cls, loan_id, customer_id):
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"""
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Get customer's active loans.
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"""
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loan = cls.query.filter_by(id=loan_id, customer_id=customer_id).first()
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if not loan:
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raise ValueError(f"Loan with ID {loan_id} does not exist or does not belong to customer {customer_id}.")
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return loan
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@classmethod
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def update_status(cls, loan_id, status):
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"""
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Update the status of the loan with the given loan_id.
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"""
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# Retrieve loan
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loan = cls.query.get(loan_id)
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if not loan:
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raise ValueError(f"Loan with ID {loan_id} does not exist.")
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if loan.status == status:
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return
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# Update loan status and the updated_at timestamp
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loan.status = status
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@classmethod
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def get_all_loans(cls, customer_id=None, account_id=None, status=None, offer_id=None,
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product_id=None, start_date=None, end_date=None, due_before=None, due_after=None):
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"""
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Get all loans with optional filtering
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Args:
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customer_id (str, optional): Filter by customer ID
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account_id (str, optional): Filter by account ID
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status (str, optional): Filter by loan status
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offer_id (str, optional): Filter by offer ID
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product_id (str, optional): Filter by product ID
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start_date (datetime, optional): Filter by start date (created_at)
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end_date (datetime, optional): Filter by end date (created_at)
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due_before (datetime, optional): Filter loans due before this date
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due_after (datetime, optional): Filter loans due after this date
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Returns:
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list: List of Loan objects
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"""
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query = cls.query
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# Apply filters if provided
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if customer_id:
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query = query.filter(cls.customer_id == customer_id)
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if account_id:
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query = query.filter(cls.account_id == account_id)
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if status:
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query = query.filter(cls.status == status)
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if offer_id:
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query = query.filter(cls.offer_id == offer_id)
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if product_id:
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query = query.filter(cls.product_id == product_id)
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if start_date:
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query = query.filter(cls.created_at >= start_date)
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if end_date:
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query = query.filter(cls.created_at <= end_date)
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if due_before:
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query = query.filter(cls.due_date <= due_before)
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if due_after:
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query = query.filter(cls.due_date >= due_after)
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# Order by created_at descending (newest first)
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query = query.order_by(cls.created_at.desc())
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return query.all()
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def to_dict(self):
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"""
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Convert the Loan object to a dictionary format for JSON serialization.
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"""
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return {
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'id': self.id,
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'customer_id': self.customer_id,
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'account_id': self.account_id,
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'offer_id': self.offer_id,
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'initial_loan_amount': self.initial_loan_amount,
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'current_loan_amount': self.current_loan_amount,
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'status': self.status,
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'product_id': self.product_id,
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'default_penalty_fee': self.default_penalty_fee,
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'continuous_fee': self.continuous_fee,
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'due_date': self.due_date.isoformat() if self.due_date else None,
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'created_at': self.created_at.isoformat() if self.created_at else None,
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'updated_at': self.updated_at.isoformat() if self.updated_at else None
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}
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def __repr__(self):
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return f'<Loan {self.id}>' |