Deduplicate-emails (#10355)

Following User request to remove duplicate emails

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

packages/twenty-server/src/modules/contact-creation-manager/utils/__tests__/get-unique-contacts-and-handles.spec.ts

@@ -29,4 +29,17 @@ describe('getUniqueContactsAndHandles', () => {
       'jane@twenty.com',
     ]);
   });
+
+  it('should deduplicate handles when they are in different cases', () => {
+    const contacts: Contact[] = [
+      { handle: 'john@twenty.com', displayName: 'John Doe' },
+      { handle: 'John@twenty.com', displayName: 'John Doe' },
+    ];
+    const result = getUniqueContactsAndHandles(contacts);
+
+    expect(result.uniqueContacts).toEqual([
+      { handle: 'john@twenty.com', displayName: 'John Doe' },
+    ]);
+    expect(result.uniqueHandles).toEqual(['john@twenty.com']);
+  });
 });

packages/twenty-server/src/modules/contact-creation-manager/utils/get-unique-contacts-and-handles.util.ts

@@ -11,9 +11,13 @@ export function getUniqueContactsAndHandles(contacts: Contact[]): {
     return { uniqueContacts: [], uniqueHandles: [] };
   }
 
-  const uniqueHandles = uniq(contacts.map((participant) => participant.handle));
+  const uniqueHandles = uniq(
+    contacts.map((participant) => participant.handle.toLocaleLowerCase()),
+  );
 
-  const uniqueContacts = uniqBy(contacts, 'handle');
+  const uniqueContacts = uniqBy(contacts, (contact) =>
+    contact.handle.toLocaleLowerCase(),
+  );
 
   return { uniqueContacts, uniqueHandles };
 }