add test for ActiveModelTrait::is_changed()

src/entity/active_model.rs

@@ -551,7 +551,8 @@ pub trait ActiveModelTrait: Clone + Debug {
 
     /// Returns `true` if any columns were changed.
     fn is_changed(&self) -> bool {
-        <Self::Entity as EntityTrait>::Column::iter().any(|col| !self.get(col).is_unchanged())
+        <Self::Entity as EntityTrait>::Column::iter()
+            .any(|col| !self.get(col).is_unchanged() && self.get(col).is_set())
     }
 }
 
@@ -1093,4 +1094,13 @@ mod tests {
 
         Ok(())
     }
+
+    #[test]
+    fn test_active_model_is_changed() {
+        let mut fruit: fruit::ActiveModel = Default::default();
+        assert!(!fruit.is_changed());
+
+        fruit.set(fruit::Column::Name, "hello!".into());
+        assert!(fruit.is_changed());
+    }
 }