Enhance QuestionFilter with title and stem search capabilities and update fields in Meta class

sbas/filters.py

@@ -2,6 +2,7 @@ import django_filters
 from dal import autocomplete
 
 from .models import Category, Question, UserAnswer, Exam
+from django.db.models import Q
 from atlas.models import Condition, Structure, Finding, Presentation, Subspecialty
 
 #from generic.filters import UserAnswerFilter
@@ -32,6 +33,11 @@ def get_authors(request):
 
 
 class QuestionFilter(django_filters.FilterSet):
+    # simple text searches
+    title = django_filters.CharFilter(field_name='title', lookup_expr='icontains', label='Title')
+    stem = django_filters.CharFilter(field_name='stem', lookup_expr='icontains', label='Stem')
+    # combined quick search across title and stem
+    q = django_filters.CharFilter(method='filter_q', label='Search')
     exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
     author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
     category = django_filters.ModelMultipleChoiceFilter(queryset=Category.objects.all(),null_label="Uncategorised")
@@ -62,7 +68,7 @@ class QuestionFilter(django_filters.FilterSet):
     )
     class Meta:
         model = Question
-        fields = ("exams", "created_date", "condition", "structure", "finding", "presentation", "category", "subspecialty")
+        fields = ("exams", "created_date", "condition", "structure", "finding", "presentation", "category", "subspecialty", "title", "stem", "q")
 
     def __init__(self, data=None, queryset=None, prefix=None, strict=None, user=None, request=None):
         if not request.user.groups.filter(name="sba_checker").exists():
@@ -70,6 +76,21 @@ class QuestionFilter(django_filters.FilterSet):
         super(QuestionFilter, self).__init__(data=data, queryset=queryset, prefix=prefix, request=request)
         pass
 
+    def filter_q(self, queryset, name, value):
+        # search both title and stem
+        if not value:
+            return queryset
+        return queryset.filter(
+            Q(title__icontains=value) |
+            Q(stem__icontains=value) |
+            Q(a_answer__icontains=value) |
+            Q(b_answer__icontains=value) |
+            Q(c_answer__icontains=value) |
+            Q(d_answer__icontains=value) |
+            Q(e_answer__icontains=value) |
+            Q(best_answer__icontains=value)
+        )
+
 class UserAnswerFilter(django_filters.FilterSet):
     class Meta:
         model= UserAnswer