diff --git a/crates/oxidetalis_core/src/types/impl_sea_orm.rs b/crates/oxidetalis_core/src/types/impl_sea_orm.rs
index c5bc1e4..8d6f7c5 100644
--- a/crates/oxidetalis_core/src/types/impl_sea_orm.rs
+++ b/crates/oxidetalis_core/src/types/impl_sea_orm.rs
@@ -44,24 +44,20 @@ impl From<PublicKey> for Value {
 
 impl TryGetable for PublicKey {
     fn try_get_by<I: sea_orm::ColIdx>(res: &QueryResult, idx: I) -> Result<Self, TryGetError> {
-        <String as TryGetable>::try_get_by(res, idx)
-            .map(|v| {
-                PublicKey::from_str(&v)
-                    .map_err(|err| TryGetError::DbErr(DbErr::Type(err.to_string())))
-            })
-            .and_then(|res| res)
+        <String as TryGetable>::try_get_by(res, idx).and_then(|v| {
+            PublicKey::from_str(&v).map_err(|err| TryGetError::DbErr(DbErr::Type(err.to_string())))
+        })
     }
 }
 
 impl ValueType for PublicKey {
     fn try_from(v: Value) -> Result<Self, ValueTypeErr> {
         <String as ValueType>::try_from(v)
-            .map(|v| PublicKey::from_str(&v).map_err(|_| ValueTypeErr))
-            .and_then(|res| res)
+            .and_then(|v| PublicKey::from_str(&v).map_err(|_| ValueTypeErr))
     }
 
     fn type_name() -> String {
-        stringify!(PublicKey).to_owned()
+        String::from("PublicKey")
     }
 
     fn array_type() -> ArrayType {