diff --git a/src/model/log.rs b/src/model/log.rs
index 1026c44..9861760 100644
--- a/src/model/log.rs
+++ b/src/model/log.rs
@@ -46,6 +46,6 @@ LIMIT 1000
         }
         ret.push_str("</channel>");
         ret.push_str("</rss>");
-        ret.replace("\n", "")
+        ret.replace('\n', "")
     }
 }
diff --git a/src/model/mod.rs b/src/model/mod.rs
index 73be211..4c428c9 100644
--- a/src/model/mod.rs
+++ b/src/model/mod.rs
@@ -33,17 +33,8 @@ impl Day {
     pub async fn new_guest(db: &SqlitePool, day: NaiveDate) -> Self {
         let mut day = Self::new(db, day).await;
 
-        day.planned_events = day
-            .planned_events
-            .into_iter()
-            .filter(|e| e.planned_event.allow_guests)
-            .collect();
-
-        day.trips = day
-            .trips
-            .into_iter()
-            .filter(|t| t.trip.allow_guests)
-            .collect();
+        day.planned_events.retain(|e| e.planned_event.allow_guests);
+        day.trips.retain(|t| t.trip.allow_guests);
 
         day
     }
diff --git a/src/model/planned_event.rs b/src/model/planned_event.rs
index 24a74c5..4ca91a5 100644
--- a/src/model/planned_event.rs
+++ b/src/model/planned_event.rs
@@ -220,8 +220,8 @@ X-WR-CALNAME:Ruderausfahrten"#,
             res.push_str(&format!("\nUID:{}@rudernlinz.at", event.id));
             res.push_str(&format!(
                 "\nDTSTART;TZID=Europe/Vienna:{}T{}00",
-                event.day.replace("-", ""),
-                event.planned_starting_time.replace(":", "")
+                event.day.replace('-', ""),
+                event.planned_starting_time.replace(':', "")
             ));
             res.push_str(&format!("\nSUMMARY:{}", event.name));
 
diff --git a/src/model/trip.rs b/src/model/trip.rs
index 92895e4..815e300 100644
--- a/src/model/trip.rs
+++ b/src/model/trip.rs
@@ -66,7 +66,7 @@ WHERE trip.id=?
         cox: &CoxUser,
         planned_event: &PlannedEvent,
     ) -> Result<(), CoxHelpError> {
-        if planned_event.is_rower_registered(db, &cox).await {
+        if planned_event.is_rower_registered(db, cox).await {
             return Err(CoxHelpError::AlreadyRegisteredAsRower);
         }
 
diff --git a/src/model/user.rs b/src/model/user.rs
index 9f3a94e..166aeec 100644
--- a/src/model/user.rs
+++ b/src/model/user.rs
@@ -115,7 +115,7 @@ ORDER BY name
 
         match user.pw.as_ref() {
             Some(user_pw) => {
-                let password_hash = &Self::get_hashed_pw(&pw);
+                let password_hash = &Self::get_hashed_pw(pw);
                 if password_hash == user_pw {
                     return Ok(user);
                 }
@@ -134,7 +134,7 @@ ORDER BY name
     }
 
     pub async fn update_pw(&self, db: &SqlitePool, pw: &str) {
-        let pw = Self::get_hashed_pw(&pw);
+        let pw = Self::get_hashed_pw(pw);
         sqlx::query!("UPDATE user SET pw = ? where id = ?", pw, self.id)
             .execute(db)
             .await