refactor + size_cmp

src/test.rs

@@ -359,6 +359,23 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn array_size_cmp() {
+        let empty: Vec<i32> = vec![];
+        let one = vec![1];
+        let two = vec![1, 2];
+        let many = vec![1, 2, 3, 4, 5, 6];
+
+        let filter = json!({
+            "list": {"$size": {"$gt": 0}}
+        });
+
+        assert!(!matches(&filter, &json!({"list": empty})));
+        assert!(matches(&filter, &json!({"list": one})));
+        assert!(matches(&filter, &json!({"list": two})));
+        assert!(matches(&filter, &json!({"list": many})));
+    }
+
     #[test]
     fn nested_modifier() {
         assert!(matches(