Storing multiple choices in databases

As an example - you have a select list of all the U.S. states and the user can make multiple choices.
How do you grab all those choices into the database and they would be used for queries.
I was reading up on serialize() but the warning in AWDWR is that it doesn’t work well for queries. Also composites / aggragates seems a bit much, maybe not.

I know in the past I’ve used addtional tables as example.

Tavels_table - id, user_id States_table - id, travel_id, state
id, travel_id, state

                                                          id, travel_id, state

So if the user chose 3 states - each of the the 3 travel_id’s above (in the States_table) would be the same and correspond to the id in the Travels_table.
Almost makes you never want to offer multiple choice selects :).

TIA
Stuart

Sorry, I know this might be off topic , more database design then Rails, but I’d like to know if there are ways in Rails to make this easier.