Fix to skip nil values in arrays

collection.go

@@ -73,11 +73,15 @@ func (c Collection) PrimaryValues() []interface{} {
 	if index != nil {
 		for i := range index {
 			var (
-				values = make([]interface{}, c.rv.Len())
+				idxLen = c.rv.Len()
+				values = make([]interface{}, 0, idxLen)
 			)
 
-			for j := range values {
-				values[j] = c.rvIndex(j).Field(index[i]).Interface()
+			for j := 0; j < idxLen; j++ {
+				if item := c.rv.Index(j); item.Kind() == reflect.Ptr && item.IsNil() {
+					continue
+				}
+				values = append(values, c.rvIndex(j).Field(index[i]).Interface())
 			}
 
 			pValues[i] = values
@@ -89,6 +93,9 @@ func (c Collection) PrimaryValues() []interface{} {
 		)
 
 		for i := 0; i < c.rv.Len(); i++ {
+			if item := c.rv.Index(i); item.Kind() == reflect.Ptr && item.IsNil() {
+				continue
+			}
 			for j, id := range c.rvIndex(i).Interface().(primary).PrimaryValues() {
 				tmp[j] = append(tmp[j], id)
 			}

collection_test.go

@@ -146,6 +146,24 @@ func TestCollection_Primary_usingElemInterface(t *testing.T) {
 	primariesCache.Delete(rt)
 }
 
+func TestCollection_Primary_usingElemInterface_ptrElem(t *testing.T) {
+	var (
+		records = []*Item{
+			{UUID: "abc123"},
+			{UUID: "def456"},
+			nil,
+		}
+		rt  = reflect.TypeOf(records).Elem()
+		col = NewCollection(&records)
+	)
+
+	// infer primary key
+	assert.Equal(t, "_uuid", col.PrimaryField())
+	assert.Equal(t, []interface{}{"abc123", "def456"}, col.PrimaryValue())
+
+	primariesCache.Delete(rt)
+}
+
 func TestCollection_Primary_usingTag(t *testing.T) {
 	var (
 		records = []struct {

repository_test.go

@@ -2953,7 +2953,7 @@ func TestRepository_DeleteAll_ptrElem(t *testing.T) {
 	var (
 		adapter = &testAdapter{}
 		repo    = New(adapter)
-		users   = []*User{{ID: 1}}
+		users   = []*User{{ID: 1}, nil}
 	)
 
 	adapter.On("Delete", From("users").Where(In("id", users[0].ID))).Return(1, nil).Once()