Add `PersistentSubsectionGradeOverride` table in django admin

EDUCATOR-1624

lms/djangoapps/grades/admin.py

@@ -3,13 +3,14 @@ Django admin page for grades models
 """
 from config_models.admin import ConfigurationModelAdmin, KeyedConfigurationModelAdmin
 from django.contrib import admin
-
+from django.utils.translation import ugettext_lazy as _
 from lms.djangoapps.grades.config.forms import CoursePersistentGradesAdminForm
 from lms.djangoapps.grades.config.models import (
     ComputeGradesSetting,
     CoursePersistentGradesFlag,
     PersistentGradesEnabledFlag
 )
+from lms.djangoapps.grades.models import PersistentSubsectionGradeOverride, PersistentSubsectionGrade
 
 
 class CoursePersistentGradesAdmin(KeyedConfigurationModelAdmin):
@@ -26,6 +27,49 @@ class CoursePersistentGradesAdmin(KeyedConfigurationModelAdmin):
         }),
     )
 
+
+class PersistentSubsectionGradeOverrideAdmin(admin.ModelAdmin):
+    fieldsets = (
+        (None, {
+            'fields': (
+                'grade',
+                'earned_all_override',
+                'earned_graded_override',
+                'possible_all_override',
+                'possible_graded_override',
+            ),
+            'description': 'Enter the ID of the subsection grade you want to override. You will probably need to '
+                           'find this in the read replica in the grades_persistentsubsectiongrade table.'
+        }),
+    )
+    list_display = [
+        'get_course_id',
+        'get_usage_key',
+        'get_user_id',
+        'earned_all_override',
+        'earned_graded_override',
+        'created',
+        'modified',
+    ]
+    list_filter = ('grade__course_id', 'grade__user_id',)
+    raw_id_fields = ('grade',)
+    search_fields = ['grade__course_id', 'grade__user_id', 'grade__usage_key']
+
+    def get_course_id(self, persistent_grade):
+        return persistent_grade.grade.course_id
+
+    def get_usage_key(self, persistent_grade):
+        return persistent_grade.grade.usage_key
+
+    def get_user_id(self, persistent_grade):
+        return persistent_grade.grade.user_id
+
+    get_course_id.short_description = _('Course Id')
+    get_usage_key.short_description = _('Usage Key')
+    get_user_id.short_description = _('User Id')
+
+
 admin.site.register(CoursePersistentGradesFlag, CoursePersistentGradesAdmin)
 admin.site.register(PersistentGradesEnabledFlag, ConfigurationModelAdmin)
 admin.site.register(ComputeGradesSetting, ConfigurationModelAdmin)
+admin.site.register(PersistentSubsectionGradeOverride, PersistentSubsectionGradeOverrideAdmin)