Quiet some new clippy warnings

src/rest_api/spatial_object.rs

@@ -22,8 +22,8 @@ fn put(path: Path<String>) -> HandlerResult {
 fn get((path, state): (Path<(String, String)>, Data<RwLock<SharedState>>)) -> HandlerResult {
     trace!("GET '{:?}'", path);
     let (core, id) = path.into_inner();
-    let core = core.to_string();
-    let id = id.to_string();
+    let core = core;
+    let id = id;
     let context = state.read().unwrap();
     let db = context.db();
 

src/shared_state.rs

@@ -84,7 +84,7 @@ impl SharedState {
                 match execution {
                     Err(e) => {
                         debug!("Parsing failed: \n{:?}", e);
-                        Err(e.to_string())
+                        Err(e)
                     }
                     results @ Ok(_) => results,
                 }
@@ -145,7 +145,7 @@ impl SharedState {
                 match execution {
                     Err(e) => {
                         debug!("Parsing failed: \n{:?}", e);
-                        Err(e.to_string())
+                        Err(e)
                     }
                     results @ Ok(_) => results,
                 }