created loans with create loans, delete loans and return loans

[nesh170]

Created loans:-

• create loans
• delete loans
• return loans (adds back to active item quantity)
• modified the ModifyQuantityMethod to work for both loans and disbursements
• modified the send cart method for dispense and plebian to support checks for loans

CHANGED API FOR CREATE DISBURSEMENT to /api/request/disbursement/

1. Get all loans GET /api/request/loan/ HTTP/1.1 Can filter by 'cartstatus', 'itemname', 'cartownerusername','returned' returned is either true or false Response:

   {
   "count": 2,
   "next": null,
   "previous": null,
   "results": [
   {
     "id": 4,
     "item": {
       "id": 5,
       "name": "iPhone 7",
       "quantity": 18
     },
     "quantity": 3,
     "cart_id": 12,
     "loaned_timestamp": "2017-03-18T20:26:47.451709Z",
     "returned_timestamp": "2017-03-18T20:28:03.874267Z"
   },
   {
     "id": 2,
     "item": {
       "id": 5,
       "name": "iPhone 7",
       "quantity": 18
     },
     "quantity": 3,
     "cart_id": 11,
     "loaned_timestamp": "2017-03-17T06:13:08.205724Z",
     "returned_timestamp": "2017-03-17T06:14:43.952348Z"
   }
   ]
   }

2. Create a loan POST /api/request/loan/addItem/ HTTP/1.1 Request:

   {
   "item_id": 5,
   "quantity": 3
   }

   Response:

   {
   "id": 5,
   "item": {
       "id": 5,
       "name": "iPhone 7",
       "quantity": 18
   },
   "quantity": 3,
   "cart_id": 13,
   "loaned_timestamp": null,
   "returned_timestamp": null
   }

3. Delete a loan DELETE /api/request/loan/deleteItem/5 HTTP/1.1

Returns HTTP_204_NO_CONTENT on success

4. Return Loan PATCH /api/request/loan/returnItem/6/ HTTP/1.1 Cart must be fulfilled already Response:

   {
   "id": 6,
   "item": {
       "id": 5,
       "name": "iPhone 7",
       "quantity": 15
   },
   "quantity": 3,
   "cart_id": 13,
   "loaned_timestamp": "2017-03-18T20:43:13.042918Z",
   "returned_timestamp": "2017-03-18T16:43:32.183303"
   }

5. Return All Loans PATCH /api/request/returnAllLoans/16/ HTTP/1.1 This returns the entire cart Response:

   {
   "id": 16,
   "owner": "plebian",
   "status": "fulfilled",
   "reason": "we put in random reason",
   "cart_disbursements": [],
   "cart_loans": [
       {
           "id": 9,
           "item": {
               "id": 5,
               "name": "iPhone 7",
               "quantity": 15
           },
           "quantity": 3,
           "cart_id": 16,
           "loaned_timestamp": "2017-03-19T17:53:40.329680Z",
           "returned_timestamp": "2017-03-19T17:53:56.556661Z"
       }
   ],
   "timestamp": "2017-03-19T17:53:01.914821Z",
   "staff_timestamp": "2017-03-19T17:53:40.283118Z",
   "staff_comment": "lit",
   "staff": "staff"
   }

6. Modify Quantity of Disbursement/Loan PATCH /api/request/modifyQuantityRequested/7/ HTTP/1.1 Type can be ['loan','disbursement'] Request:

   {
   "type": "loan",
   "quantity": 1
   }

   Response:

   {
   "id": 7,
   "item": {
       "id": 5,
       "name": "iPhone 7",
       "quantity": 18
   },
   "quantity": 1,
   "cart_id": 14,
   "loaned_timestamp": null,
   "returned_timestamp": null
   }

7. Convert Request Type POST /api/request/convertRequestType/ HTTP/1.1 Request:

   {
   "current_type": "disbursement",
   "pk": 10
   }

   Response:

   {
   "id": 11,
   "item": {
   "id": 7,
   "name": "Samsung Galaxy Note",
   "quantity": 9000
   },
   "quantity": 3,
   "cart_id": 7,
   "cart_owner": "panda",
   "loaned_timestamp": "2017-03-16T19:11:49.825038Z",
   "returned_timestamp": null
   }

   current_type = ['loan','disbursement'] pk = pk of the current_type They are response are both the same (except if current_type is loan, then there is no loaned_timestamp or returned_timestamp).