在ActiveRecord_Relation结果中移动项目？

Question

I want to be able to return User.all with current_user as the first result, and the rest sorted alphabetically by user.name .

What's the "Rails" way to do this? I think it's to convert the ActiveRecord_Relation to an array and then use a combo of .insert and .delete_at to move the target User from its current position to the front. Would I want to create a helper method for that? Or is there a completely different approach?

Thanks!

Answer 1

Not the most "railsy" way, but this should work:

users  = User.all.append(User.find(current_user.id))
users = (users & users).reverse!

Answer 2

In one query:

users = User.where("id != ?", current_user.id).all.insert(0, User.find(current_user.id))

However, please remember that it's almost always a bad idea to build your site around User.all queries... after 10,000+ users your app will grind to a halt. Wherever you are doing this query you should paginate the results.