Improve postgres example code style

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

heromodels/examples/postgres_model_example.rs

@@ -96,10 +96,10 @@ fn main() {
         .set(&user4)
         .expect("can set user");
 
-    println!("User 1 assigned ID: {}", user1_id);
-    println!("User 2 assigned ID: {}", user2_id);
-    println!("User 3 assigned ID: {}", user3_id);
-    println!("User 4 assigned ID: {}", user4_id);
+    println!("User 1 assigned ID: {user1_id}");
+    println!("User 2 assigned ID: {user2_id}");
+    println!("User 3 assigned ID: {user3_id}");
+    println!("User 4 assigned ID: {user4_id}");
 
     // We already have the updated models from the set method, so we don't need to retrieve them again
 
@@ -140,14 +140,14 @@ fn main() {
         .expect("can load stored users");
 
     assert_eq!(active_users.len(), 2);
-    for (_i, active_user) in active_users.iter().enumerate() {
+    for active_user in active_users.iter() {
         print_user_details(active_user);
     }
 
     // 3. Delete a user and show the updated results
     println!("\n3. After Deleting a User:");
     let user_to_delete_id = active_users[0].get_id();
-    println!("Deleting user with ID: {}", user_to_delete_id);
+    println!("Deleting user with ID: {user_to_delete_id}");
     db.collection::<User>()
         .expect("can open user collection")
         .delete_by_id(user_to_delete_id)
@@ -162,7 +162,7 @@ fn main() {
 
     println!("   a. Remaining Active Users:");
     assert_eq!(active_users.len(), 1);
-    for (_i, active_user) in active_users.iter().enumerate() {
+    for active_user in active_users.iter() {
         print_user_details(active_user);
     }
 
@@ -175,7 +175,7 @@ fn main() {
 
     println!("   b. Inactive Users:");
     assert_eq!(inactive_users.len(), 2);
-    for (_i, inactive_user) in inactive_users.iter().enumerate() {
+    for inactive_user in inactive_users.iter() {
         print_user_details(inactive_user);
     }
 
@@ -199,7 +199,7 @@ fn main() {
         .set(&comment)
         .expect("can set comment");
 
-    println!("Comment assigned ID: {}", comment_id);
+    println!("Comment assigned ID: {comment_id}");
 
     println!("   a. Comment Retrieved from Database:");
     print_comment_details(&db_comment);