title: Rails session store to persist search params between requests
body: <p>I know this is a frequent question, but I couldn't find it on this terms:</p>
  
  <p>I have a main page table, with some category filters.
  But as the user jumps from pages to pages inside my website, I want that when he returns to the main page, that the filters will still be checked as he did.
  But would like to avoid storing that in the database for 3 reasons: #1: the public users can use that feature; #2: Avoid another model in the database; #3: Performance penalty to query another table on every index load.
  What is the best way to achieve this? any example?
  How can I do this?
  Thank you all</p>