I think that sort of code is extremely common. It's a bit less awkward if `current_user` is never nil, but sometimes a non-saved Guest record, letting you write

I think that sort of code is extremely common. It's a bit less awkward if `current_user` is never nil, but sometimes a non-saved Guest record, letting you write code like this: @posts = current_user.posts @posts = @posts.where(user_id: params[:user_id]) if params[:user_id]