changes

crates/application/src/user/preferences.rs

@@ -0,0 +1,16 @@
+use std::sync::Arc;
+
+use domain::ports::UserPreferencesQueryPort;
+use domain::user::{UserId, UserPreferences};
+
+use crate::errors::ApplicationError;
+
+pub async fn preferences_of(
+    user_id: &UserId,
+    query: &Arc<dyn UserPreferencesQueryPort>,
+) -> Result<UserPreferences, ApplicationError> {
+    Ok(query
+        .find_by_user(user_id)
+        .await?
+        .unwrap_or_else(|| UserPreferences::off_by_default(user_id.clone())))
+}