PGError: ERROR: duplicate key value violates unique constraint

Syntax: 

SELECT setval('table_name_id_seq'::regclass, MAX(id)) FROM table_name;

Example of usage:

SELECT setval('personal_contacts_personal_folders_id_seq'::regclass, MAX(id)) FROM personal_contacts_personal_folders;

RJS error: TypeError: element.style is undefined in rails

Q: RJS error: TypeError: element.style is undefined in rails

Ans : add prototype js in your html page.