.

rear/src/admin/domain.rs

@@ -350,11 +350,28 @@ pub mod repository {
         }
     }
 
+    pub trait PrimaryKeyType {
+        fn key_as_string(&self) -> String;
+        fn key_from_string(&self, s: String) -> Self;
+    }
+
+    impl PrimaryKeyType for i64 {
+        fn key_as_string(&self) -> String {
+            self.to_string()
+        }
+
+        fn key_from_string(&self, s: String) -> Self {
+            s.parse::<usize>().unwrap() as i64
+        }
+    }
+
     #[async_trait]
     pub trait AdminRepository: Send + Sync {
+        type Key: PrimaryKeyType;
+
         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 +380,76 @@ 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>;
+    }
+
+    use std::any::Any;
+
+    trait Key: Any {
+        fn as_any(&self) -> &dyn Any;
+        fn from_str(s: &str) -> Self
+        where
+            Self: Sized;
+        fn to_string(&self) -> String;
+    }
+
+    impl<T: Any> Key for T {
+        fn as_any(&self) -> &dyn Any {
+            self
+        }
+    }
+
+    impl Key for String {
+        fn from_str(s: &str) -> Self {
+            s.to_string()
+        }
+
+        fn to_string(&self) -> String {
+            self.clone()
+        }
+    }
+
+    impl Key for i64 {
+        fn from_str(s: &str) -> Self {
+            s.parse().expect("Invalid i64 string")
+        }
+
+        fn to_string(&self) -> String {
+            self.to_string()
+        }
+    }
+
+    #[async_trait]
+    pub trait ErasedAdminRepository: Send + Sync {
+        async fn info(&self, context: &RepositoryContext) -> RepositoryInfo;
+        async fn list(&self, context: &RepositoryContext) -> RepositoryList;
+        async fn get(&self, context: &RepositoryContext, id: &dyn Key) -> Option<RepositoryItem>;
+        async fn create(
+            &mut self,
+            context: &RepositoryContext,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn update(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn Key,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn replace(
+            &mut self,
+            context: &RepositoryContext,
+            id: &dyn Key,
+            data: Value,
+        ) -> Option<RepositoryItem>;
+        async fn delete(&mut self, context: &RepositoryContext, id: &dyn Key) -> Option<Value>;
     }
 }

src/bin/generic_trait_type_erasure.rs

@@ -0,0 +1,37 @@
+
+
+pub trait Repository {
+    type Key;
+
+    fn get_data(&self, key: Self::Key) -> String;
+    fn set_data(&self, key: Self::Key, value: String);
+}
+
+use std::any::Any;
+
+trait Key: Any {
+    fn as_any(&self) -> &dyn Any;
+    fn from_str(s: &str) -> Self where Self: Sized;
+    fn to_string(&self) -> String;
+}
+
+impl<T: Any> Key for T {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+}
+
+impl Key for String {
+    fn from_str(s: &str) -> Self {
+        s.to_string()
+    }
+
+    fn to_string(&self) -> String {
+        self.clone()
+    }
+}
+
+pub trait RepositoryTypeErased {
+    fn get_data(&self, key: Key) -> String;
+    fn set_data(&self, key: Key, value: String);
+}