barker/barker/views/reports/discount_report.py

import datetime

from pyramid.httpexceptions import HTTPForbidden
from pyramid.view import view_config
from sqlalchemy import func

from barker.models import Inventory, Kot, Product, MenuCategory, Settlement, SettleOption, Voucher


@view_config(request_method='GET', route_name='discount_report', renderer='json', permission='Discount Report',
             request_param=('s', 'f'))
def discount_report(request):
    start_date = datetime.datetime.strptime(request.GET['s'], '%d-%b-%Y %H:%M')
    finish_date = datetime.datetime.strptime(request.GET['f'], '%d-%b-%Y %H:%M')

    if (datetime.date.today() - start_date.date()).days > 5 and 'Accounts Audit' not in request.effective_principals:
        raise HTTPForbidden("Accounts Audit")

    amount = func.sum(Inventory.quantity * Inventory.effective_price * Inventory.discount).label('Amount')
    list = request.dbsession.query(
        MenuCategory.group_type, amount
    ).join(Voucher.kots).join(Kot.inventories).join(Inventory.product).join(Product.menu_category).filter(
        Voucher.date >= start_date,
        Voucher.date <= finish_date,
        Voucher.is_void == False,
        Inventory.discount != 0,
        Voucher.settlements.any(~Settlement.settled.in_(
            [SettleOption.CASH(), SettleOption.CREDIT_CARD(), SettleOption.BILL_TO_COMPANY(),
             SettleOption.UNSETTLED()]))
    ).group_by(
        MenuCategory.group_type
    ).order_by(
        MenuCategory.group_type
    ).all()

    return [{'GroupType': pg, 'Amount': amt} for pg, amt in list]