group_by_date_messages.rb

gistfile1.rb

 @messages.each do |day, messages|
  %li.date_divider.w-full.block
    .break
      %span= "#{day.strftime("%B %d")}"

  %ul
    - messages.each do |message|
      - if !unread_messages && @chatroom_user.last_read_at < message.created_at
        - unread_messages = true
        .strike
          %span Unread Messages
      = render partial: 'admin/facilities/chatrooms/chatroom/messages/message',
        locals: {message: message, facility: @facility, chatroom: @chatroom}