add filterset for buys api

projects/filters.py

@@ -0,0 +1,20 @@
+import django_filters
+from projects.models import IAA, Project, Buy
+
+
+class BuyFilter(django_filters.rest_framework.FilterSet):
+    min_dollars = django_filters.NumberFilter(
+        name="dollars",
+        lookup_expr='gte',
+    )
+    max_dollars = django_filters.NumberFilter(
+        name="dollars",
+        lookup_expr='lte',
+    )
+
+    class Meta:
+        model = Buy
+        # Allowing filtering by project leaks non-public project names in the
+        # browseable API, so it cannot be provided here until the browseable
+        # API is turned off
+        fields = ['id', 'name', 'min_dollars', 'max_dollars']

projects/views.py

@@ -16,6 +16,7 @@
 from projects.models import IAA, Project, Buy
 from projects.serializers import IAASerializer, ProjectSerializer, BuySerializer
 from projects.forms import QASPForm, AcquisitionPlanForm, MarketResearchForm
+from projects.filters import BuyFilter
 from nda.forms import NDAForm
 
 
@@ -284,9 +285,7 @@ class BuyList(mixins.ListModelMixin,
     List all buys
     """
     serializer_class = BuySerializer
-    # TODO: fancier filterset:
-    # http://www.django-rest-framework.org/api-guide/filtering/#specifying-a-filterset
-    filter_fields = ('name',)
+    filter_class = BuyFilter
 
     def get_queryset(self):
         if self.request.user.has_perm('projects.view_project'):