diff --git a/src/models.rs b/src/models.rs
index 3b348c3..e1fc17c 100644
--- a/src/models.rs
+++ b/src/models.rs
@@ -56,16 +56,20 @@ pub struct Sample {
 }
 
 impl Sample {
-    pub fn create(conn: &Connection, name: &String) -> Sample {
+    pub fn create(conn: &Connection, name: &str) -> Sample {
         let mut stmt = conn
             .prepare("INSERT INTO sample (name) VALUES (?1)")
             .unwrap();
         match stmt.execute((name,)) {
-            Ok(_) => Sample { name: name.clone() },
+            Ok(_) => Sample {
+                name: name.to_string(),
+            },
             Err(rusqlite::Error::SqliteFailure(err, details)) => {
                 if err.code == rusqlite::ErrorCode::ConstraintViolation {
                     println!("{err:?} {details:?}");
-                    Sample { name: name.clone() }
+                    Sample {
+                        name: name.to_string(),
+                    }
                 } else {
                     panic!("something bad happened querying the database")
                 }
diff --git a/src/models/block_group.rs b/src/models/block_group.rs
index a23cba6..5f0900a 100644
--- a/src/models/block_group.rs
+++ b/src/models/block_group.rs
@@ -149,6 +149,12 @@ impl BlockGroup {
             vec![SQLValue::from(source_block_group_id)],
         );
 
+        let edge_ids = BlockGroupEdge::edges_for_block_group(conn, source_block_group_id)
+            .iter()
+            .map(|edge| edge.id)
+            .collect();
+        BlockGroupEdge::bulk_create(conn, target_block_group_id, edge_ids);
+
         for path in existing_paths {
             let edge_ids = PathEdge::edges_for(conn, path.id)
                 .into_iter()
@@ -162,7 +168,7 @@ impl BlockGroup {
         conn: &Connection,
         collection_name: &str,
         sample_name: &str,
-        group_name: String,
+        group_name: &str,
     ) -> i32 {
         let mut bg_id : i32 = match conn.query_row(
             "select id from block_group where collection_name = ?1 AND sample_name = ?2 AND name = ?3",
@@ -527,7 +533,7 @@ impl BlockGroup {
 mod tests {
     use super::*;
     use crate::migrations::run_migrations;
-    use crate::models::Collection;
+    use crate::models::{Collection, Sample};
 
     fn get_connection() -> Connection {
         let mut conn = Connection::open_in_memory()
@@ -624,6 +630,36 @@ mod tests {
         (block_group.id, path)
     }
 
+    #[test]
+    fn test_blockgroup_create() {
+        let conn = &get_connection();
+        Collection::create(conn, "test");
+        let bg1 = BlockGroup::create(conn, "test", None, "hg19");
+        assert_eq!(bg1.collection_name, "test");
+        assert_eq!(bg1.name, "hg19");
+        Sample::create(conn, "sample");
+        let bg2 = BlockGroup::create(conn, "test", Some("sample"), "hg19");
+        assert_eq!(bg2.collection_name, "test");
+        assert_eq!(bg2.name, "hg19");
+        assert_eq!(bg2.sample_name, Some("sample".to_string()));
+        assert_ne!(bg1.id, bg2.id);
+    }
+
+    #[test]
+    fn test_blockgroup_clone() {
+        let conn = &get_connection();
+        Collection::create(conn, "test");
+        let bg1 = BlockGroup::create(conn, "test", None, "hg19");
+        assert_eq!(bg1.collection_name, "test");
+        assert_eq!(bg1.name, "hg19");
+        Sample::create(conn, "sample");
+        let bg2 = BlockGroup::get_or_create_sample_block_group(conn, "test", "sample", "hg19");
+        assert_eq!(
+            BlockGroupEdge::edges_for_block_group(conn, bg1.id),
+            BlockGroupEdge::edges_for_block_group(conn, bg2)
+        );
+    }
+
     #[test]
     fn insert_and_deletion_new_get_all() {
         let conn = get_connection();
diff --git a/src/models/edge.rs b/src/models/edge.rs
index 3443dfd..98b8245 100644
--- a/src/models/edge.rs
+++ b/src/models/edge.rs
@@ -3,7 +3,7 @@ use rusqlite::{params_from_iter, Connection};
 use std::collections::HashSet;
 use std::hash::RandomState;
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Edge {
     pub id: i32,
     pub source_hash: String,