What's the best method to show user his vote type (for/against/abstain) on page with lots of post items?
direct query is
SELECT vote_type FROM votes WHERE post_id = 888 AND user_id = 888 and direct way with rails
post.votes.where(:user_id => current_user.id).pluck(:vote_type).first
but it's too heavy and stupid to make db query for every post.
I can build array of posts_id and make one query
@posts.each do |post| ids << post.id end votes = Vote.select(:post_id, :vote_type).where(:user_id => current_user.id, :post_id => ids)SELECT post_id, vote_type FROM votes WHERE user_id = 888 AND post_id IN (887, 888, 889)
Is there built-in "magick" methods in rails? I use postgresql.
Full description on stackoverflow, does anyone can help?