ruby-on-rails,json,sorting , Sorting in Ruby on rails


Sorting in Ruby on rails

Question:

Tag: ruby-on-rails,json,sorting

I'm very new to Ruby on rails. I try to edit the following api.
I want to sorting "can_go" which is true are shown at the top of list.
I added this row before sending data, but the result is still order by "user_id".

user_infos.sort {  |a, b| - (a['can_go']<=>b['can_go'])  }

Could you please tell me how to change this source?
Thank you. Here is the source.

def send_user_infos cmd_id, users: []
    users_app_modes = UsersAppMode.where(user_id: users.map(&:id),
                                     app_mode: AppMode.mode1).includes(:user)
    user_infos = users_app_modes.map do |ua|
      u = ua.user
      c = alive_connections[u]
      state = c ? c.state : :logoff
      begin
      {
        user_id: u.id.to_s,
        name: u.display_name,
        score: (ua.total_superior_score.ceil rescue 150),
        state: state,
        format_state: state,
        can_go: c ? true : false,
      }
      rescue => e
        logger.error e.to_s
        nil
      end
    end.compact
    user_infos.sort {  |a, b| - (a['can_go']<=>b['can_go'])  }
    send_data "users_info #{user_infos.map { |i| CGI.escape(i.to_json) }.join " "}", cmd_id: cmd_id 
end

Answer:

You're not getting the results you want because you're not assigning the sorted user_infos back into the user_infos variable. You can do the following:

user_infos = user_infos.sort {|a, b| - (a['can_go'] <=> b['can_go']) }
# -or-
user_infos.sort! {|a, b| - (a['can_go'] <=> b['can_go']) }

The first version of sort creates a new array, which requires assignment; the second version sort! sorts in place and therefore doesn't require the assignment.


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