Every API has access control logic. The question isn't whether you'll write permission checks — it's whether they'll be scattered across your view methods or consolidated into reusable, testable units. On BookMyTest (a test-voucher booking platform for IELTS, GRE, GMAT, and similar exams) I chose the latter, and it made the codebase dramatically easier to maintain.

The Problem with Ad-Hoc Permission Checks

When permission logic lives inside view methods — buried in if-statements — it's invisible to the framework, difficult to test in isolation, and easy to accidentally omit. Every new view becomes an opportunity to forget a check. As your API grows, this leads to inconsistent enforcement and security gaps that are hard to audit.

Django REST Framework's BasePermission

DRF gives you a clean hook: subclass BasePermission, implement has_permission (and optionally has_object_permission), and DRF calls it automatically before your view logic runs. The check is now explicit, named, and centrally defined.

python

from rest_framework.permissions import BasePermission

class IsLabAdmin(BasePermission):
    """Allows access only to users with the 'lab_admin' role."""

    message = "You must be a lab administrator to perform this action."

    def has_permission(self, request, view):
        return (
            request.user.is_authenticated
            and request.user.role == "lab_admin"
        )

class IsOwnerOrAdmin(BasePermission):
    """Object-level: allow owners to access their own records, or admins."""

    def has_object_permission(self, request, view, obj):
        if request.user.role == "lab_admin":
            return True
        return obj.user == request.user

Composing Permissions

DRF lets you stack multiple permission classes on a view — all must pass. This means you can compose fine-grained checks from small, single-responsibility classes rather than building one monolithic class that handles every scenario.

python

class BookingDetailView(RetrieveUpdateDestroyAPIView):
    # IsAuthenticated AND IsOwnerOrAdmin must both pass
    permission_classes = [IsAuthenticated, IsOwnerOrAdmin]

Benefits in Practice

Each permission class has a single responsibility — easy to read, reason about, and test.
Permissions are tested independently of views, giving you high confidence in your access control logic.
Adding a new role or rule means writing a new class, not hunting through existing view code.
The permission_classes declaration on each view is a clear, auditable record of who can access what.