LIL-267. Add admin for payments

apps/payment/admin.py

@@ -1,3 +1,36 @@
 from django.contrib import admin
+from polymorphic.admin import (
+    PolymorphicParentModelAdmin,
+    PolymorphicChildModelAdmin,
+    PolymorphicChildModelFilter,
+)
 
-# Register your models here.
+from .models import CoursePayment, SchoolPayment, Payment
+
+
+class PaymentChildAdmin(PolymorphicChildModelAdmin):
+    base_model = Payment
+    show_in_index = True
+    base_fieldsets = (
+        (None, {'fields': ('user', 'amount', 'status', 'data',)}),
+    )
+
+
+@admin.register(CoursePayment)
+class CoursePaymentAdmin(PaymentChildAdmin):
+    base_model = CoursePayment
+
+
+@admin.register(SchoolPayment)
+class SchoolPaymentAdmin(PaymentChildAdmin):
+    base_model = SchoolPayment
+
+
+@admin.register(Payment)
+class PaymentAdmin(PolymorphicParentModelAdmin):
+    base_model = Payment
+    polymorphic_list = True
+    child_models = (
+        CoursePayment,
+        SchoolPayment,
+    )