LTI-415: Make pagination backwards compatible

app/controllers/concerns/bbb_helper.rb

@@ -125,31 +125,40 @@ def meeting_running?
 
   # Fetches all recordings for a room.
   def recordings(page = 1)
-    res = Rails.cache.fetch("rooms/#{@chosen_room.handler}/#{RECORDINGS_KEY}", expires_in: Rails.configuration.cache_expires_in_minutes.minutes) if Rails.configuration.cache_enabled
-    offset = (page.to_i - 1) * RECORDINGS_PER_PAGE # The offset is an index that starts at 0.
-    res ||= bbb.get_recordings(meetingID: @chosen_room.handler, offset: offset, limit: RECORDINGS_PER_PAGE) # offset and limit are for pagination purposes
+    res = Rails.cache.fetch("rooms/#{@chosen_room.handler}/#{RECORDINGS_KEY}/page#{page}", expires_in: Rails.configuration.cache_expires_in_minutes.minutes) if Rails.configuration.cache_enabled
+
+    if res
+      logger.debug("Pulled recordings from cache: #{res}")
+    else
+      offset = (page.to_i - 1) * RECORDINGS_PER_PAGE # The offset is an index that starts at 0.
+      logger.debug('Could not find recordings in cache. Pulling them from BBB: ')
+      res ||= bbb.get_recordings(meetingID: @chosen_room.handler, offset: offset, limit: RECORDINGS_PER_PAGE) # offset and limit are for pagination purposes
+    end
+
     @num_of_recs = res[:totalElements]&.to_i
     recordings_formatted(res)
   end
 
   def paginate?
-    @num_of_recs ? @num_of_recs > RECORDINGS_PER_PAGE : false
-  end
+    return true if @num_of_recs && @num_of_recs > RECORDINGS_PER_PAGE
 
-  # returns the amount of pages for recordings
-  def pages_count
-    @num_of_recs ? (@num_of_recs.to_f / RECORDINGS_PER_PAGE).ceil : 1
+    recordings_count > RECORDINGS_PER_PAGE
   end
 
-  # on the last page, we don't want recordings that were in the second-to-last page to show
-  def recordings_limit(page)
-    page_int = page.to_i
-    num_of_recs = recordings_count
-    recordings_overflow = num_of_recs - page_int * RECORDINGS_PER_PAGE
-    # if offset is > 0 and there are less recordings than the current page * recordings per page, then we'll need to pass a limit that's less than what's defined in RECORDINGS_PER_PAGE
-    return recordings_overflow if page_int.positive? && recordings_overflow < RECORDINGS_PER_PAGE
+  # This method is used if #@num_of_recs is null, which means that totalElements is not present in the BBB response.
+  # Pull the rest of the recordings to see if we need to paginate.
+  # Set offset to 8 because we know that at least one page was already pulled.
+  # Set the limit to the max number of recordings that can be pulled.
+  def recordings_count
+    res_count = Rails.cache.fetch("rooms/#{@chosen_room.handler}/#{RECORDINGS_KEY}/remaining", expires_in: Rails.configuration.cache_expires_in_minutes.minutes) if Rails.configuration.cache_enabled
+    res_count ||= bbb.get_recordings(meetingID: @chosen_room.handler, offset: RECORDINGS_PER_PAGE, limit: 100)[:recordings].length
+    @num_of_recs = res_count + RECORDINGS_PER_PAGE # We add RECORDINGS_PER_PAGE because we set the offset to 1
+    @num_of_recs
+  end
 
-    RECORDINGS_PER_PAGE
+  # returns the amount of pages for recordings
+  def pages_count
+    (@num_of_recs.to_f / RECORDINGS_PER_PAGE).ceil
   end
 
   # Fetch an individual recording

app/controllers/rooms_controller.rb

@@ -236,6 +236,8 @@ def recording_delete
   def individual_recording
     rec = recording(params[:record_id])
     formats_arr = rec[:playback][:format]
+    formats_arr = [formats_arr] unless formats_arr.is_a?(Array) # for when BBB returns just one format
+
     format_obj = formats_arr.find { |i| i[:type] == params[:format] }
 
     playback_url = format_obj[:url]

app/views/shared/_room.html.erb

@@ -196,8 +196,8 @@
       </div>
 
 
-    <% numOfPages = pages_count %>
     <% if paginate? %>
+     <% numOfPages = pages_count %>
       <div class="flex justify-center items-center mb-5" id="pagination-container" data-current-page="<%= @page %>" data-total-pages="<%= numOfPages %>">
         <nav aria-label="Page navigation example">
           <ul class="flex items-center -space-x-px h-8 text-sm">