diff --git a/src/api/admin.rs b/src/api/admin.rs
index 7f91364..d2e06b0 100644
--- a/src/api/admin.rs
+++ b/src/api/admin.rs
@@ -149,7 +149,7 @@ fn invite_user(data: Json<InviteData>, _token: AdminToken, conn: DbConn) -> Empt
         let org_name = "bitwarden_rs";
         mail::send_invite(&user.email, &user.uuid, None, None, &org_name, None)
     } else {
-        let mut invitation = Invitation::new(data.email);
+        let invitation = Invitation::new(data.email);
         invitation.save(&conn)
     }
 }
diff --git a/src/api/core/organizations.rs b/src/api/core/organizations.rs
index bd2088c..4396733 100644
--- a/src/api/core/organizations.rs
+++ b/src/api/core/organizations.rs
@@ -76,9 +76,9 @@ struct NewCollectionData {
 fn create_organization(headers: Headers, data: JsonUpcase<OrgData>, conn: DbConn) -> JsonResult {
     let data: OrgData = data.into_inner().data;
 
-    let mut org = Organization::new(data.Name, data.BillingEmail);
+    let org = Organization::new(data.Name, data.BillingEmail);
     let mut user_org = UserOrganization::new(headers.user.uuid.clone(), org.uuid.clone());
-    let mut collection = Collection::new(org.uuid.clone(), data.CollectionName);
+    let collection = Collection::new(org.uuid.clone(), data.CollectionName);
 
     user_org.key = data.Key;
     user_org.access_all = true;
@@ -221,7 +221,7 @@ fn post_organization_collections(
         None => err!("Can't find organization details"),
     };
 
-    let mut collection = Collection::new(org.uuid.clone(), data.Name);
+    let collection = Collection::new(org.uuid.clone(), data.Name);
     collection.save(&conn)?;
 
     Ok(Json(collection.to_json()))
@@ -484,7 +484,7 @@ fn send_invite(org_id: String, data: JsonUpcase<InviteData>, headers: AdminHeade
                 }
 
                 if !CONFIG.mail_enabled() {
-                    let mut invitation = Invitation::new(email.clone());
+                    let invitation = Invitation::new(email.clone());
                     invitation.save(&conn)?;
                 }
 
@@ -581,7 +581,7 @@ fn reinvite_user(org_id: String, user_org: String, headers: AdminHeaders, conn:
             Some(headers.user.email),
         )?;
     } else {
-        let mut invitation = Invitation::new(user.email.clone());
+        let invitation = Invitation::new(user.email.clone());
         invitation.save(&conn)?;
     }
 
@@ -851,7 +851,7 @@ fn post_org_import(
         .Collections
         .into_iter()
         .map(|coll| {
-            let mut collection = Collection::new(org_id.clone(), coll.Name);
+            let collection = Collection::new(org_id.clone(), coll.Name);
             if collection.save(&conn).is_err() {
                 err!("Failed to create Collection");
             }
diff --git a/src/db/models/collection.rs b/src/db/models/collection.rs
index 5261bec..c6047aa 100644
--- a/src/db/models/collection.rs
+++ b/src/db/models/collection.rs
@@ -43,11 +43,11 @@ use crate::error::MapResult;
 
 /// Database methods
 impl Collection {
-    pub fn save(&mut self, conn: &DbConn) -> EmptyResult {
+    pub fn save(&self, conn: &DbConn) -> EmptyResult {
         self.update_users_revision(conn);
 
         diesel::replace_into(collections::table)
-            .values(&*self)
+            .values(self)
             .execute(&**conn)
             .map_res("Error saving collection")
     }
diff --git a/src/db/models/organization.rs b/src/db/models/organization.rs
index 702284c..491c4fc 100644
--- a/src/db/models/organization.rs
+++ b/src/db/models/organization.rs
@@ -213,7 +213,7 @@ use crate::error::MapResult;
 
 /// Database methods
 impl Organization {
-    pub fn save(&mut self, conn: &DbConn) -> EmptyResult {
+    pub fn save(&self, conn: &DbConn) -> EmptyResult {
         UserOrganization::find_by_org(&self.uuid, conn)
             .iter()
             .for_each(|user_org| {
@@ -221,7 +221,7 @@ impl Organization {
             });
 
         diesel::replace_into(organizations::table)
-            .values(&*self)
+            .values(self)
             .execute(&**conn)
             .map_res("Error saving organization")
     }
@@ -323,11 +323,11 @@ impl UserOrganization {
         })
     }
 
-    pub fn save(&mut self, conn: &DbConn) -> EmptyResult {
+    pub fn save(&self, conn: &DbConn) -> EmptyResult {
         User::update_uuid_revision(&self.user_uuid, conn);
 
         diesel::replace_into(users_organizations::table)
-            .values(&*self)
+            .values(self)
             .execute(&**conn)
             .map_res("Error adding user to organization")
     }
diff --git a/src/db/models/user.rs b/src/db/models/user.rs
index 94ddc1a..c447a92 100644
--- a/src/db/models/user.rs
+++ b/src/db/models/user.rs
@@ -225,13 +225,13 @@ impl Invitation {
         Self { email }
     }
 
-    pub fn save(&mut self, conn: &DbConn) -> EmptyResult {
+    pub fn save(&self, conn: &DbConn) -> EmptyResult {
         if self.email.trim().is_empty() {
             err!("Invitation email can't be empty")
         }
 
         diesel::replace_into(invitations::table)
-            .values(&*self)
+            .values(self)
             .execute(&**conn)
             .map_res("Error saving invitation")
     }