diff --git a/rear/src/admin/domain.rs b/rear/src/admin/domain.rs
index 2450603..f29d2f3 100644
--- a/rear/src/admin/domain.rs
+++ b/rear/src/admin/domain.rs
@@ -2,8 +2,8 @@ pub use config::AdminModelConfig;
 pub use dto::AdminApp;
 pub use dto::AdminModel;
 pub use repository::{
-    AdminRepository, LookupKey, RepoInfo, RepositoryContext, RepositoryInfo, RepositoryItem,
-    RepositoryList, Widget,
+    AdminRepository, DynAdminRepository, RepoInfo, RepositoryContext, RepositoryInfo,
+    RepositoryItem, RepositoryList, Widget,
 };
 
 mod auth {
@@ -54,6 +54,8 @@ pub mod repository {
     use async_trait::async_trait;
     use serde::{Serialize, Serializer};
     use serde_json::Value;
+    use std::any::Any;
+    use std::fmt::Debug;
     use std::vec::IntoIter;
 
     pub type RepositoryContext = AdminModel;
@@ -179,48 +181,6 @@ pub mod repository {
         }
     }
 
-    #[derive(PartialEq)]
-    pub enum LookupKey {
-        Integer(usize),
-        String(String),
-    }
-
-    // Note that LookupKey auto converts to integer.
-    impl From<String> for LookupKey {
-        fn from(s: String) -> Self {
-            if let Ok(int_key) = s.parse::<usize>() {
-                LookupKey::Integer(int_key)
-            } else {
-                LookupKey::String(s)
-            }
-        }
-    }
-
-    impl From<&str> for LookupKey {
-        fn from(s: &str) -> Self {
-            if let Ok(int_key) = s.parse::<usize>() {
-                LookupKey::Integer(int_key)
-            } else {
-                LookupKey::String(s.to_owned())
-            }
-        }
-    }
-
-    impl From<usize> for LookupKey {
-        fn from(i: usize) -> Self {
-            LookupKey::Integer(i)
-        }
-    }
-
-    impl std::fmt::Display for LookupKey {
-        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-            match self {
-                LookupKey::Integer(i) => write!(f, "{}", i),
-                LookupKey::String(s) => write!(f, "{}", s),
-            }
-        }
-    }
-
     #[derive(Serialize)]
     pub struct RepositoryItem {
         pub fields: Value,
@@ -350,11 +310,41 @@ pub mod repository {
         }
     }
 
+    pub trait PrimaryKeyType: Any + Debug + Send + Sync {
+        fn as_any(&self) -> &dyn Any;
+    }
+
+    impl PrimaryKeyType for i64 {
+        fn as_any(&self) -> &dyn Any {
+            self
+        }
+    }
+
+    impl PrimaryKeyType for String {
+        fn as_any(&self) -> &dyn Any {
+            self
+        }
+    }
+
+    impl From<String> for Box<dyn PrimaryKeyType> {
+        fn from(s: String) -> Box<dyn PrimaryKeyType> {
+            if let Ok(i) = s.parse::<i64>() {
+                Box::new(i)
+            } else {
+                Box::new(s)
+            }
+        }
+    }
+
     #[async_trait]
     pub trait AdminRepository: Send + Sync {
+        type Key: PrimaryKeyType;
+
+        fn key_from_string(&self, s: String) -> Option<Self::Key>;
+
         async fn info(&self, context: &RepositoryContext) -> RepositoryInfo;
         async fn list(&self, context: &RepositoryContext) -> RepositoryList;
-        async fn get(&self, context: &RepositoryContext, id: LookupKey) -> Option<RepositoryItem>;
+        async fn get(&self, context: &RepositoryContext, id: &Self::Key) -> Option<RepositoryItem>;
         async fn create(
             &mut self,
             context: &RepositoryContext,
@@ -363,15 +353,140 @@ pub mod repository {
         async fn update(
             &mut self,
             context: &RepositoryContext,
-            id: LookupKey,
+            id: &Self::Key,
             data: Value,
         ) -> Option<RepositoryItem>;
         async fn replace(
             &mut self,
             context: &RepositoryContext,
-            id: LookupKey,
+            id: &Self::Key,
             data: Value,
         ) -> Option<RepositoryItem>;
-        async fn delete(&mut self, context: &RepositoryContext, id: LookupKey) -> Option<Value>;
+        async fn delete(&mut self, context: &RepositoryContext, id: &Self::Key) -> Option<Value>;
+    }
+
+    #[async_trait]
+    pub trait DynAdminRepository: Send + Sync {
+        fn key_from_string(&self, s: String) -> Option<Box<dyn PrimaryKeyType>>;
+        async fn info(&self, context: &RepositoryContext) -> RepositoryInfo;
+        async fn list(&self, context: &RepositoryContext) -> RepositoryList;
+        async fn get(
+            &self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+        ) -> Option<RepositoryItem>;
+        async fn create(
+            &mut self,
+            context: &RepositoryContext,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn update(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn replace(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn delete(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+        ) -> Option<Value>;
+    }
+
+    pub struct AdminRepositoryWrapper<T: AdminRepository> {
+        inner: T,
+    }
+
+    impl<T: AdminRepository> AdminRepositoryWrapper<T> {
+        pub fn new(inner: T) -> Self {
+            Self { inner }
+        }
+
+        fn key_from_string(&self, s: String) -> Option<<T as AdminRepository>::Key> {
+            self.inner.key_from_string(s)
+        }
+    }
+
+    #[async_trait]
+    impl<T: AdminRepository> DynAdminRepository for AdminRepositoryWrapper<T> {
+        fn key_from_string(&self, s: String) -> Option<Box<dyn PrimaryKeyType>> {
+            if let Some(key) = self.inner.key_from_string(s) {
+                Some(Box::new(key))
+            } else {
+                None
+            }
+        }
+
+        async fn info(&self, context: &RepositoryContext) -> RepositoryInfo {
+            self.inner.info(context).await
+        }
+
+        async fn list(&self, context: &RepositoryContext) -> RepositoryList {
+            self.inner.list(context).await
+        }
+
+        async fn get(
+            &self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+        ) -> Option<RepositoryItem> {
+            if let Some(key) = id.as_any().downcast_ref::<T::Key>() {
+                self.inner.get(context, key).await
+            } else {
+                None
+            }
+        }
+
+        async fn create(
+            &mut self,
+            context: &RepositoryContext,
+            data: Value,
+        ) -> Option<RepositoryItem> {
+            self.inner.create(context, data).await
+        }
+
+        async fn update(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+            data: Value,
+        ) -> Option<RepositoryItem> {
+            if let Some(key) = id.as_any().downcast_ref::<T::Key>() {
+                self.inner.update(context, key, data).await
+            } else {
+                None
+            }
+        }
+
+        async fn replace(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+            data: Value,
+        ) -> Option<RepositoryItem> {
+            if let Some(key) = id.as_any().downcast_ref::<T::Key>() {
+                self.inner.replace(context, key, data).await
+            } else {
+                None
+            }
+        }
+
+        async fn delete(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn PrimaryKeyType,
+        ) -> Option<Value> {
+            if let Some(key) = id.as_any().downcast_ref::<T::Key>() {
+                self.inner.delete(context, key).await
+            } else {
+                None
+            }
+        }
     }
 }
diff --git a/rear/src/admin/state.rs b/rear/src/admin/state.rs
index 5464eb7..6adf430 100644
--- a/rear/src/admin/state.rs
+++ b/rear/src/admin/state.rs
@@ -1,6 +1,7 @@
 use tokio::sync::Mutex;
 
-use super::domain::{AdminApp, AdminModel, AdminModelConfig, AdminRepository};
+use super::domain::repository::AdminRepositoryWrapper;
+use super::domain::{AdminApp, AdminModel, AdminModelConfig, AdminRepository, DynAdminRepository};
 use crate::service::templates::Templates;
 use std::collections::HashMap;
 use std::sync::Arc;
@@ -17,7 +18,7 @@ pub struct AdminRegistry {
     base_path: String,
     apps: HashMap<String, internal::AdminApp>,
     models: HashMap<String, internal::AdminModel>,
-    repositories: HashMap<String, Arc<Mutex<dyn AdminRepository>>>,
+    repositories: HashMap<String, Arc<Mutex<dyn DynAdminRepository>>>,
 }
 
 impl AdminRegistry {
@@ -113,6 +114,7 @@ impl AdminRegistry {
         repository: R,
     ) -> Result<(), String> {
         let model_key = self.register_model_config(model)?;
+        let repository = AdminRepositoryWrapper::new(repository);
         self.repositories
             .insert(model_key, Arc::new(Mutex::new(repository)));
         Ok(())
@@ -122,7 +124,7 @@ impl AdminRegistry {
         &self,
         app_key: &str,
         model_key: &str,
-    ) -> Result<Arc<Mutex<dyn AdminRepository>>, String> {
+    ) -> Result<Arc<Mutex<dyn DynAdminRepository>>, String> {
         let full_model_key = format!("{}.{}", app_key, model_key);
         if let Some(repo) = self.repositories.get(&full_model_key) {
             // Clone the Arc to return a reference to the repository
diff --git a/rear/src/admin/views.rs b/rear/src/admin/views.rs
index 2357653..2c05593 100644
--- a/rear/src/admin/views.rs
+++ b/rear/src/admin/views.rs
@@ -9,7 +9,7 @@ use crate::admin::domain::{AdminApp, AdminModel};
 use crate::admin::state::AdminState;
 use serde::{Deserialize, Serialize};
 
-use super::domain::{LookupKey, RepositoryInfo, RepositoryItem, RepositoryList};
+use super::domain::{RepositoryInfo, RepositoryItem, RepositoryList};
 
 #[derive(Serialize, Deserialize)]
 pub struct AdminRequest {
@@ -157,15 +157,22 @@ pub async fn view_item_details<S: AdminState + Clone + Send + Sync + 'static>(
         let admin_model = registry
             .get_model(&app_key, &model_key)
             .expect("Admin Model not found?");
-        let key: LookupKey = id.into();
-        AdminContext {
-            base: base_template(&headers),
-            available_apps: registry.get_apps(),
-            item_info: Some(repo.info(&admin_model).await),
-            item_list: repo.list(&admin_model).await,
-            item: repo.get(&admin_model, key).await,
-            item_model: Some(admin_model),
-            ..Default::default()
+        if let Some(key) = repo.key_from_string(id) {
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                item_info: Some(repo.info(&admin_model).await),
+                item_list: repo.list(&admin_model).await,
+                item: repo.get(&admin_model, key.as_ref()).await,
+                item_model: Some(admin_model),
+                ..Default::default()
+            }
+        } else {
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                ..Default::default()
+            }
         }
     } else {
         AdminContext {
@@ -257,15 +264,22 @@ pub async fn change_item<S: AdminState + Clone + Send + Sync + 'static>(
         let admin_model = registry
             .get_model(&app_key, &model_key)
             .expect("Admin Model not found?");
-        let key: LookupKey = id.into();
-        AdminContext {
-            base: base_template(&headers),
-            available_apps: registry.get_apps(),
-            item_info: Some(repo.info(&admin_model).await),
-            item_list: repo.list(&admin_model).await,
-            item: repo.get(&admin_model, key).await,
-            item_model: Some(admin_model),
-            ..Default::default()
+        if let Some(key) = repo.key_from_string(id) {
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                item_info: Some(repo.info(&admin_model).await),
+                item_list: repo.list(&admin_model).await,
+                item: repo.get(&admin_model, key.as_ref()).await,
+                item_model: Some(admin_model),
+                ..Default::default()
+            }
+        } else {
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                ..Default::default()
+            }
         }
     } else {
         AdminContext {
@@ -290,18 +304,23 @@ pub async fn update_item<S: AdminState + Clone + Send + Sync + 'static>(
         let admin_model = registry
             .get_model(&app_key, &model_key)
             .expect("Admin Model not found?");
-        let key: LookupKey = id.into();
-
-        let result = repo.update(&admin_model, key, form).await;
-
-        AdminContext {
-            base: base_template(&headers),
-            available_apps: registry.get_apps(),
-            item_info: Some(repo.info(&admin_model).await),
-            item_list: repo.list(&admin_model).await,
-            item: result,
-            item_model: Some(admin_model),
-            ..Default::default()
+        if let Some(key) = repo.key_from_string(id) {
+            let result = repo.update(&admin_model, key.as_ref(), form).await;
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                item_info: Some(repo.info(&admin_model).await),
+                item_list: repo.list(&admin_model).await,
+                item: result,
+                item_model: Some(admin_model),
+                ..Default::default()
+            }
+        } else {
+            AdminContext {
+                base: base_template(&headers),
+                available_apps: registry.get_apps(),
+                ..Default::default()
+            }
         }
     } else {
         AdminContext {
diff --git a/src/admin_examples/empty_repository.rs b/src/admin_examples/empty_repository.rs
index 114d1ec..91e6eed 100644
--- a/src/admin_examples/empty_repository.rs
+++ b/src/admin_examples/empty_repository.rs
@@ -8,6 +8,16 @@ impl Repository {}
 
 #[async_trait]
 impl AdminRepository for Repository {
+    type Key = i64;
+
+    fn key_from_string(&self, s: String) -> Option<Self::Key> {
+        if let Ok(i) = s.parse::<i64>() {
+            Some(i)
+        } else {
+            None
+        }
+    }
+
     async fn info(&self, _: &RepositoryContext) -> RepositoryInfo {
         RepoInfo {
             name: "My Empty Repository",
@@ -33,7 +43,7 @@ impl AdminRepository for Repository {
     }
 
     // GET single item.
-    async fn get(&self, model: &RepositoryContext, id: LookupKey) -> Option<RepositoryItem> {
+    async fn get(&self, model: &RepositoryContext, id: &Self::Key) -> Option<RepositoryItem> {
         None
     }
 
@@ -41,7 +51,7 @@ impl AdminRepository for Repository {
     async fn update(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         None
@@ -51,14 +61,14 @@ impl AdminRepository for Repository {
     async fn replace(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         None
     }
 
     // DELETE single item.
-    async fn delete(&mut self, _: &RepositoryContext, id: LookupKey) -> Option<Value> {
+    async fn delete(&mut self, _: &RepositoryContext, id: &Self::Key) -> Option<Value> {
         None
     }
 }
diff --git a/src/admin_examples/static_repository.rs b/src/admin_examples/static_repository.rs
index 1ac82d0..d62b32e 100644
--- a/src/admin_examples/static_repository.rs
+++ b/src/admin_examples/static_repository.rs
@@ -36,6 +36,16 @@ impl MyStaticRepository {
 
 #[async_trait]
 impl AdminRepository for MyStaticRepository {
+    type Key = i64;
+
+    fn key_from_string(&self, s: String) -> Option<Self::Key> {
+        if let Ok(i) = s.parse::<i64>() {
+            Some(i)
+        } else {
+            None
+        }
+    }
+
     async fn info(&self, _: &RepositoryContext) -> RepositoryInfo {
         RepoInfo {
             name: "My Static Repository",
@@ -48,15 +58,11 @@ impl AdminRepository for MyStaticRepository {
         //.set_widget("name", Widget::textarea().options(&[("disabled", "true")]))
     }
 
-    async fn get(&self, model: &RepositoryContext, id: LookupKey) -> Option<RepositoryItem> {
-        if let LookupKey::Integer(id) = id {
-            let item = self.content.get(id - 1).cloned().unwrap();
-            let id = item.get("id").unwrap();
-            Some(model.build_item(&*id.to_string(), item))
-        } else {
-            warn!("Got non-integer lookup key: {}", id);
-            None
-        }
+    async fn get(&self, model: &RepositoryContext, id: &Self::Key) -> Option<RepositoryItem> {
+        let id = *id as usize;
+        let item = self.content.get(id - 1).cloned().unwrap();
+        let id = item.get("id").unwrap();
+        Some(model.build_item(&*id.to_string(), item))
     }
 
     async fn list(&self, model: &RepositoryContext) -> RepositoryList {
@@ -94,7 +100,7 @@ impl AdminRepository for MyStaticRepository {
     async fn update(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         debug!("I would now update: {}, {}", id, data);
@@ -102,10 +108,7 @@ impl AdminRepository for MyStaticRepository {
         // First, find the index of the item to update
         let item_index = self.content.iter().position(|item| {
             if let Some(item_id) = item.get("id") {
-                match id {
-                    LookupKey::Integer(i) => item_id == &i,
-                    LookupKey::String(ref s) => item_id == s,
-                }
+                item_id == id
             } else {
                 false
             }
@@ -127,21 +130,18 @@ impl AdminRepository for MyStaticRepository {
     async fn replace(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         self.update(model, id, data).await
     }
 
-    async fn delete(&mut self, _: &RepositoryContext, id: LookupKey) -> Option<Value> {
+    async fn delete(&mut self, _: &RepositoryContext, id: &Self::Key) -> Option<Value> {
         debug!("Would delete: {}", id);
 
         let item_index = self.content.iter().position(|item| {
             if let Some(item_id) = item.get("id") {
-                match id {
-                    LookupKey::Integer(i) => item_id == &i,
-                    LookupKey::String(ref s) => item_id == s,
-                }
+                item_id == id
             } else {
                 false
             }
diff --git a/src/admin_examples/user_repository.rs b/src/admin_examples/user_repository.rs
index 16a483c..19db3fd 100644
--- a/src/admin_examples/user_repository.rs
+++ b/src/admin_examples/user_repository.rs
@@ -19,6 +19,16 @@ impl UserRepository {
 
 #[async_trait]
 impl AdminRepository for UserRepository {
+    type Key = i64;
+
+    fn key_from_string(&self, s: String) -> Option<Self::Key> {
+        if let Ok(i) = s.parse::<i64>() {
+            Some(i)
+        } else {
+            None
+        }
+    }
+
     async fn info(&self, _: &RepositoryContext) -> RepositoryInfo {
         RepoInfo {
             name: "User",
@@ -29,25 +39,24 @@ impl AdminRepository for UserRepository {
         .into()
     }
 
-    async fn get(&self, model: &RepositoryContext, id: LookupKey) -> Option<RepositoryItem> {
-        if let LookupKey::Integer(id) = id {
-            let id: i32 = id as i32; // use try_into() instead.
-            let get_user = entity::User::find_by_id(id).one(&self.connection).await;
-            match get_user {
-                Ok(get_user) => {
-                    if let Some(user) = get_user {
-                        let id = user.id.to_string();
-                        match serde_json::to_value(&user) {
-                            Ok(item) => {
-                                return Some(model.build_item(&*id, item));
-                            }
-                            Err(_) => return None,
+    async fn get(&self, model: &RepositoryContext, id: &Self::Key) -> Option<RepositoryItem> {
+        let id: i32 = *id as i32; // use try_into() instead.
+        let get_user = entity::User::find_by_id(id).one(&self.connection).await;
+        match get_user {
+            Ok(get_user) => {
+                if let Some(user) = get_user {
+                    let id = user.id.to_string();
+                    match serde_json::to_value(&user) {
+                        Ok(item) => {
+                            return Some(model.build_item(&*id, item));
                         }
+                        Err(_) => return None,
                     }
                 }
-                Err(_) => return None,
             }
+            Err(_) => return None,
         }
+
         None
     }
 
@@ -94,58 +103,56 @@ impl AdminRepository for UserRepository {
     async fn update(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
-        if let LookupKey::Integer(id) = id {
-            let id: i32 = id as i32; // use try_into() instead.
-            let user: Option<entity::user::Model> = entity::User::find_by_id(id)
-                .one(&self.connection)
-                .await
-                .unwrap();
-            let mut user: entity::user::ActiveModel = user.unwrap().into();
+        let id: i32 = *id as i32;
+        let user: Option<entity::user::Model> = entity::User::find_by_id(id)
+            .one(&self.connection)
+            .await
+            .unwrap();
+        let mut user: entity::user::ActiveModel = user.unwrap().into();
 
-            // change values
-            if let Some(value) = data.get("username") {
-                if let Some(value) = value.as_str() {
-                    user.username = Set(value.to_owned());
-                }
-            }
-
-            if let Some(value) = data.get("description") {
-                user.description = Set(value.as_str().map(|s| s.to_owned()));
-            }
-
-            // update
-            if let Ok(user) = user.update(&self.connection).await {
-                let id = user.id.to_string();
-                return Some(model.build_item(&*id, serde_json::to_value(&user).unwrap()));
+        // change values
+        if let Some(value) = data.get("username") {
+            if let Some(value) = value.as_str() {
+                user.username = Set(value.to_owned());
             }
         }
+
+        if let Some(value) = data.get("description") {
+            user.description = Set(value.as_str().map(|s| s.to_owned()));
+        }
+
+        // update
+        if let Ok(user) = user.update(&self.connection).await {
+            let id = user.id.to_string();
+            return Some(model.build_item(&*id, serde_json::to_value(&user).unwrap()));
+        }
+
         None
     }
 
     async fn replace(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         self.update(model, id, data).await
     }
 
-    async fn delete(&mut self, _: &RepositoryContext, id: LookupKey) -> Option<Value> {
-        if let LookupKey::Integer(id) = id {
-            let id: i32 = id as i32; // use try_into() instead.
-            let user: Option<entity::user::Model> = entity::User::find_by_id(id)
-                .one(&self.connection)
-                .await
-                .unwrap();
-            if let Some(user) = user {
-                let delete_result = user.delete(&self.connection).await.unwrap();
-                debug!("deleted rows: {}", delete_result.rows_affected);
-            }
+    async fn delete(&mut self, _: &RepositoryContext, id: &Self::Key) -> Option<Value> {
+        let id: i32 = *id as i32;
+        let user: Option<entity::user::Model> = entity::User::find_by_id(id)
+            .one(&self.connection)
+            .await
+            .unwrap();
+        if let Some(user) = user {
+            let delete_result = user.delete(&self.connection).await.unwrap();
+            debug!("deleted rows: {}", delete_result.rows_affected);
         }
+
         None
     }
 }
diff --git a/src/bin/generic_trait_type_erasure.rs b/src/bin/generic_trait_type_erasure.rs
new file mode 100644
index 0000000..d6c9428
--- /dev/null
+++ b/src/bin/generic_trait_type_erasure.rs
@@ -0,0 +1,142 @@
+use std::any::Any;
+use std::collections::HashMap;
+use std::fmt::Debug;
+
+// Define the Key trait with Any and Debug for type erasure and debugging
+pub trait Key: Any + Debug {
+    fn as_any(&self) -> &dyn Any;
+}
+
+// Implement Key for i32
+impl Key for i32 {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+}
+
+// Implement Key for String
+impl Key for String {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+}
+
+// Implement From<String> for i32
+impl From<String> for Box<dyn Key> {
+    fn from(s: String) -> Box<dyn Key> {
+        if let Ok(i) = s.parse::<i32>() {
+            Box::new(i)
+        } else {
+            Box::new(s)
+        }
+    }
+}
+
+// Define the Repository trait with an associated type Key
+pub trait Repository {
+    type Key: Key;
+    fn get_entry(&self, key: &Self::Key) -> String;
+}
+
+// Define a helper trait for dynamic dispatch
+pub trait DynRepository {
+    fn get_entry(&self, key: &dyn Key) -> String;
+}
+
+// Define a type-erased wrapper for Repository
+pub struct RepositoryWrapper<T: Repository> {
+    inner: T,
+}
+
+impl<T: Repository> RepositoryWrapper<T> {
+    pub fn new(inner: T) -> Self {
+        Self { inner }
+    }
+}
+
+impl<T: Repository> DynRepository for RepositoryWrapper<T> {
+    fn get_entry(&self, key: &dyn Key) -> String {
+        if let Some(key) = key.as_any().downcast_ref::<T::Key>() {
+            self.inner.get_entry(key)
+        } else {
+            "Invalid Key Type".to_string()
+        }
+    }
+}
+
+// Implement the Repository trait for IntRepository
+pub struct IntRepository {
+    data: HashMap<i32, String>,
+}
+
+impl IntRepository {
+    pub fn new() -> Self {
+        let mut data = HashMap::new();
+        data.insert(1, "IntEntry1".to_string());
+        data.insert(2, "IntEntry2".to_string());
+        Self { data }
+    }
+}
+
+impl Repository for IntRepository {
+    type Key = i32;
+
+    fn get_entry(&self, key: &Self::Key) -> String {
+        self.data
+            .get(key)
+            .unwrap_or(&"Not Found".to_string())
+            .clone()
+    }
+}
+
+// Implement the Repository trait for StringRepository
+pub struct StringRepository {
+    data: HashMap<String, String>,
+}
+
+impl StringRepository {
+    pub fn new() -> Self {
+        let mut data = HashMap::new();
+        data.insert("one".to_string(), "StringEntry1".to_string());
+        data.insert("two".to_string(), "StringEntry2".to_string());
+        Self { data }
+    }
+}
+
+impl Repository for StringRepository {
+    type Key = String;
+
+    fn get_entry(&self, key: &Self::Key) -> String {
+        self.data
+            .get(key)
+            .unwrap_or(&"Not Found".to_string())
+            .clone()
+    }
+}
+
+fn main() {
+    let int_repo = IntRepository::new();
+    let string_repo = StringRepository::new();
+
+    let repositories: Vec<Box<dyn DynRepository>> = vec![
+        Box::new(RepositoryWrapper::new(int_repo)),
+        Box::new(RepositoryWrapper::new(string_repo)),
+    ];
+
+    // Creating keys from strings using the From<String> implementation
+    let keys: Vec<Box<dyn Key>> = vec![
+        Box::new(1_i32),
+        Box::new("one".to_string()),
+        Box::new(99_i32),                // non-existing int key
+        Box::new("unknown".to_string()), // non-existing string key
+        Box::from("123".to_string()),    // i32 key from string
+        Box::from("hello".to_string()),  // String key from string
+    ];
+
+    for key in keys {
+        for repo in &repositories {
+            let result = repo.get_entry(key.as_ref());
+            println!("Result: {}", result);
+        }
+    }
+}