added model admin for coupons

manage_coupons/admin.py

@@ -1,3 +1,40 @@
 from django.contrib import admin
+from .models import Coupon
 
-# Register your models here.
+
+class CouponAdmin(admin.ModelAdmin):
+    list_display = (
+        "id",
+        "title",
+        "coupon_id",
+        "coupon_code",
+        "discount_amount",
+        "discount_percentage",
+        "valid_from",
+        "valid_to",
+        "max_redeems",
+        "no_of_redeems",
+        "is_active",
+    )
+    search_fields = ("title", "coupon_code")
+    list_filter = ("valid_from", "valid_to", "max_redeems")
+    readonly_fields = ("no_of_redeems",)
+
+    fieldsets = (
+        (
+            None,
+            {"fields": ("title", "coupon_code", "coupon_id", "description", "image")},
+        ),
+        (
+            "Discount Information",
+            {"fields": ("discount_amount", "discount_percentage")},
+        ),
+        ("Validity", {"fields": ("valid_from", "valid_to")}),
+        ("Redemption", {"fields": ("max_redeems", "no_of_redeems")}),
+    )
+
+    def is_active(self, obj):
+        return obj.is_valid()
+
+
+admin.site.register(Coupon, CouponAdmin)