diff --git a/README.md b/README.md
index c4a255c..3db58d8 100644
--- a/README.md
+++ b/README.md
@@ -69,3 +69,17 @@ Install a postgres:
 
 ![Mugshot of Admin](./docs/mugshot.png)
 
+
+### Project Structure
+
+#### Root Folders
+
+ - docker: all about docker, atm. database docker image for development.
+ - docs: place for all future documentation, including this.
+ - entity: crate containing database models
+ - migration: crate containing database migrations
+ - rear: crate containing the main library for rear
+ - src: crate containing a runnable project implementing rear as a demo project
+ - static: static files used by rear
+ - strinto: experimental crate for an idea.
+ - templates: all templates for rear-admiral.
\ No newline at end of file
diff --git a/rear/src/admin/domain.rs b/rear/src/admin/domain.rs
index f29d2f3..53d5124 100644
--- a/rear/src/admin/domain.rs
+++ b/rear/src/admin/domain.rs
@@ -326,16 +326,6 @@ pub mod repository {
         }
     }
 
-    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;
diff --git a/src/admin_examples/file_repository.rs b/src/admin_examples/file_repository.rs
index 5ee8d2b..206dce9 100644
--- a/src/admin_examples/file_repository.rs
+++ b/src/admin_examples/file_repository.rs
@@ -10,7 +10,6 @@ struct FileRepository {
 
 impl FileRepository {
     pub fn new(from_path: &str) -> Self {
-        
         let proper_path = file_operations::get_proper_path(from_path);
         FileRepository {
             directory_path: proper_path,
@@ -20,6 +19,12 @@ impl FileRepository {
 
 #[async_trait]
 impl AdminRepository for FileRepository {
+    type Key = String;
+
+    fn key_from_string(&self, s: String) -> Option<Self::Key> {
+        Some(s)
+    }
+
     async fn info(&self, _: &RepositoryContext) -> RepositoryInfo {
         RepoInfo {
             name: "File Repository",
@@ -41,13 +46,16 @@ impl AdminRepository for FileRepository {
     // GET on item collection.
     async fn list(&self, model: &RepositoryContext) -> RepositoryList {
         if let Ok(file_data) = file_operations::directory_info(&self.directory_path) {
-            let items: Vec<RepositoryItem> = file_data.into_iter().map(|fields| {
-                RepositoryItem {
-                    fields,
-                    detail_url: None, // TODO: change the return type of directory_info into a struct, so we can access key.
-                    change_url: None,
-                }
-            }).collect();
+            let items: Vec<RepositoryItem> = file_data
+                .into_iter()
+                .map(|fields| {
+                    RepositoryItem {
+                        fields,
+                        detail_url: None, // TODO: change the return type of directory_info into a struct, so we can access key.
+                        change_url: None,
+                    }
+                })
+                .collect();
             return RepositoryList::List { values: items };
         }
         RepositoryList::Empty
@@ -63,7 +71,7 @@ impl AdminRepository for FileRepository {
     }
 
     // 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
     }
 
@@ -71,7 +79,7 @@ impl AdminRepository for FileRepository {
     async fn update(
         &mut self,
         model: &RepositoryContext,
-        id: LookupKey,
+        id: &Self::Key,
         data: Value,
     ) -> Option<RepositoryItem> {
         None
@@ -81,14 +89,14 @@ impl AdminRepository for FileRepository {
     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
     }
 }
@@ -108,13 +116,13 @@ pub fn register(registry: &mut AdminRegistry, path: &str) {
 }
 
 mod file_operations {
+    use chrono::{DateTime, TimeZone, Utc};
     use serde_json::{json, Value};
+    use std::env;
     use std::fs;
     use std::path::Path;
-    use std::env;
     use std::path::PathBuf;
     use std::time::SystemTime;
-    use chrono::{DateTime, Utc, TimeZone};
 
     fn system_time_to_iso_string(system_time: SystemTime) -> String {
         let datetime: DateTime<Utc> = system_time.into();
@@ -157,7 +165,9 @@ mod file_operations {
         get_metadata_as_json(path)
     }
 
-    pub fn directory_info(directory_path: &PathBuf) -> Result<Vec<Value>, Box<dyn std::error::Error>> {
+    pub fn directory_info(
+        directory_path: &PathBuf,
+    ) -> Result<Vec<Value>, Box<dyn std::error::Error>> {
         let entries = fs::read_dir(directory_path)?;
         let mut results = Vec::new();
 
@@ -181,6 +191,5 @@ mod file_operations {
             let template_path = PathBuf::from(manifest_dir).join(path);
             return template_path;
         }
-        
     }
 }