fixed the primary keys => all the classes have now composite primary key which contais an id + user_id, necessary gem: 'composite_primary_keys'
fixed the user_id relation => every class now "belongs_to" user
pls kill me know
I have no idea how this requirement shall be implemented at the end, but at first step, the tiss_crawler.rb lib checks if the search_term is an empty string and returns an error msg if found
otherwise it returns the result, but appended to 'content' key
