Add "random" sort option for Smart Playlists

model/criteria/criteria_test.go

@@ -81,4 +81,10 @@ var _ = Describe("Criteria", func() {
 		gomega.Expect(string(j)).To(gomega.Equal(jsonObj))
 	})
 
+	It("allows sort by random", func() {
+		newObj := goObj
+		newObj.Sort = "random"
+		gomega.Expect(newObj.OrderBy()).To(gomega.Equal("random() asc"))
+	})
+
 })

model/criteria/fields.go

@@ -43,6 +43,7 @@ var fieldMap = map[string]*mappedField{
 	"lastplayed":      {field: "annotation.play_date"},
 	"playcount":       {field: "COALESCE(annotation.play_count, 0)", order: "annotation.play_count"},
 	"rating":          {field: "COALESCE(annotation.rating, 0)", order: "annotation.rating"},
+	"random":          {field: "-", order: "random()"},
 }
 
 type mappedField struct {