fix handling of simple filters and add a unit test for filters being …

…passed from manager.

manager_test.go

@@ -2,6 +2,7 @@ package goresource_test
 
 import (
 	"fmt"
+	"net/url"
 
 	"goresource"
 	"goresource/mocks"
@@ -73,6 +74,17 @@ var _ = Describe("DefaultManager", func() {
 	})
 	Describe(".ListEntities", func() {
 		It("returns the fetched entities from the store.", func() {
+			want := []map[string]interface{}{{"item1": "value1"}, {"item2": "value2"}}
+			store.EXPECT().ListEntities("test", url.Values{"field": []string{"value"}}, gomock.Any()).Times(1).SetArg(2, want).Return(nil)
+			result, err := manager.ListEntities(url.Values{"field": []string{"value"}})
+			Expect(err).To(BeNil())
+			got, ok := result.([]map[string]interface{})
+			Expect(ok).To(BeTrue())
+			Expect(len(got)).To(Equal(2))
+			Expect(got[0]["item1"]).To(Equal("value1"))
+			Expect(got[1]["item2"]).To(Equal("value2"))
+		})
+		It("returns the fetched entities with filters from the store.", func() {
 			want := []map[string]interface{}{{"item1": "value1"}, {"item2": "value2"}}
 			store.EXPECT().ListEntities("test", nil, gomock.Any()).Times(1).SetArg(2, want).Return(nil)
 			result, err := manager.ListEntities(nil)

store/mongo.go

@@ -44,7 +44,7 @@ func (s *MongoStore) ListEntities(name string, filters url.Values, result interf
 		if strings.HasSuffix(k, "~") {
 			search[k[0:len(k)-1]] = bson.M{"$regex": v[0], "$options": "im"}
 		} else {
-			if len(v) > 0 {
+			if len(v) > 1 {
 				search[k] = bson.M{"$in": v}
 			} else {
 				search[k] = v[0]