@group_meetings = GroupMeeting.where('lang_one_id IN (?) AND lang_two_id IN (?) AND meeting_time >= ?', @user.languages.pluck(:id), @user.languages.pluck(:id), Date.today)

   @new_group_meetings_id = []

   @group_meetings.each do |meeting|
     meeting.group_meetings_user.each do |user|
       if(user.user.location === @user.location)
         @new_group_meetings_id.push(meeting.id)
       end
     end
   end

   @group_meetings = GroupMeeting.where('id IN (?)', @new_group_meetings_id)

class GroupMeeting < ApplicationRecord
    has_many :group_meetings_user
    has_many :users, through: :group_meetings_users
end

class GroupMeetingsUser < ApplicationRecord
    belongs_to :user
    belongs_to :group_meeting

    validates_presence_of :user_id, :group_meeting_id
    validates :user_id, :uniqueness => {:scope => :group_meeting_id, :message => 'can only join each group once.'}
end