fix #2 (#3)

* fix #2

Author: sneljo1

query/query.go

@@ -196,6 +196,10 @@ func test(data interface{}, userQuery interface{}) (bool, error) {
 
 	} else {
 
+		if userQuery == nil || data == nil {
+			return false, nil
+		}
+
 		bool, err1 := rules.Eq.Match(data, userQuery)
 
 		if err1 != nil {

test/exists_test.go

@@ -1,8 +1,9 @@
 package test
 
 import (
-	"github.com/wearetheledger/go-couchdb-query-engine/query"
 	"testing"
+
+	"github.com/wearetheledger/go-couchdb-query-engine/query"
 )
 
 func TestExists(t *testing.T) {

test/main_test.go

@@ -36,6 +36,7 @@ var TestData = map[string]interface{}{
 	"MARBLE3": map[string]interface{}{
 		"objectType": "MARBLE",
 		"owner":      "arnold",
+		"image":      "https://example.com/image.png",
 		"size":       5,
 		"previousOwners": []string{
 			"alice",
@@ -68,4 +69,4 @@ res, err := query.ParseCouchDBQuery(TestData, map[string]interface{}{
 			},
 		},
 	})
- */
+*/

test/missing_properties_test.go

@@ -0,0 +1,27 @@
+package test
+
+import (
+	"testing"
+
+	"github.com/wearetheledger/go-couchdb-query-engine/query"
+)
+
+func TestQueryWithSomeMissingProperties(t *testing.T) {
+
+	t.Run("Element should be returned when properties are missing in other records", func(t *testing.T) {
+
+		res, err := query.ParseCouchDBQuery(TestData, map[string]interface{}{
+			"selector": map[string]interface{}{
+				"image": "https://example.com/image.png",
+			},
+		})
+
+		if err != nil {
+			t.Error(err)
+		}
+
+		if len(res) != 1 {
+			t.Error("Query should have returned 1 results")
+		}
+	})
+}