Design a CRUD Backend | Dataford Interview Questions

Design a CRUD based application (backend only). This was asked in the Take-home assignment stage, Take-home round 1; the candidate implemented it in JavaScript and Node.js. The fuller prompt was: "Design a CRUD based application (Backend only) for railway reservation system."

Implement process_reservations(operations). Each operation is a dictionary with action (create, read, update, or delete) and reservation_id; create operations also include passenger, train, and seat. Return one result per operation: the reservation for successful create, read, or update, True or False for delete, and None for invalid or missing records.

Example: creating R1 returns its record; reading R1 returns the same record.

Constraints

1 <= operations.length <= 1000
Each reservation_id is a non-empty string
Each create operation contains passenger, train, and seat
Reservation IDs are unique among simultaneously active reservations
Updates modify only passenger, train, and seat

Function Signature

def process_reservations(operations):

Your question is Design a CRUD Backend. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Example: creating R1 returns its record; reading R1 returns the same record.

Constraints

1 <= operations.length <= 1000
Each reservation_id is a non-empty string
Each create operation contains passenger, train, and seat
Reservation IDs are unique among simultaneously active reservations
Updates modify only passenger, train, and seat

Function Signature

def process_reservations(operations):

Your question is Design a CRUD Backend. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.