Рельсы |Я хочу показать только некоторые статьи

Question

У меня есть 2 таблицы: -user_activity: содержит действия идентификатора и идентификатор пользователя -activity: содержит идентификатор, идентификатор пользователя и т. Д.1003 *

есть мой код: -activities содержат ВСЕ действия пользователя -usersactivities_id содержат ВСЕ user_activity пользователя в одной вкладке (например: 10, 2, 3)

  def fetch_maj_activities
    user = current_user
    activities = []
    user.groups.each do |group|
      activities << Activity.where(group: group)
    end


    usersactivities_id = current_user.user_activities.select('activity_id').map(&:activity_id).uniq

    activities.each do |activity|
      if usersactivities_id.include? activity.id
      else
        activities = activities.flatten.reject {|a| a.id == activity.id}
      end
    end
    @all_activities = activities.flatten.sort_by(&:updated_at).reverse
    respond_to do |format|
      format.js
    end
  end

log:

  CACHE Activity Load (0.0ms)  SELECT  "activities".* FROM "activities" WHERE "activities"."group_id" = $1 LIMIT $2  [["group_id", 1], ["LIMIT", 11]]
  ↳ /home/benjamin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/activerecord-5.2.0.rc1/lib/active_record/log_subscriber.rb:98
NoMethodError (undefined method `id' for #<ActiveRecord::Relation []>
Did you mean?  ids):

app/controllers/activities_controller.rb:65:in `block in fetch_maj_activities'
app/controllers/activities_controller.rb:64:in `each'
app/controllers/activities_controller.rb:64:in `fetch_maj_activities'

Answer 1

Ответ есть, у меня работает :)

  def fetch_maj_activities

    user = current_user
    activities = []
    usersactivities_id = current_user.user_activities.select('activity_id').map(&:activity_id).uniq

    user.groups.each do |group|
      activities << Activity.where(group: group)
    end



    usersactivities_id.each do |useractid|
      activities.flatten.each do |act|
        if act.id == useractid
          activities = activities.reject {|a|a}

        end
      end
    end

    @all_activities = activities.flatten.sort_by(&:updated_at).reverse
    respond_to do |format|
      format.js {render :action => "fetch_activities"}
    end
  end