Merge pull request #1085 from PlanoramaEvents/plan-1010-speed-up-sess…

…ion-query

PLAN-1010 Speed up the query time for session retreival

app/controllers/sessions_controller.rb

@@ -229,14 +229,15 @@ def references
     ]
   end
 
-  # def eager_load
-  #   [
-  #     # {session_areas: :area},
-  #     # :areas,
-  #     # :published_session,
-  #     # {taggings: :tag}
-  #   ]
-  # end
+
+  def eager_load
+    [
+      {session_areas: :area},
+      # :areas,
+      # :published_session,
+      # {taggings: :tag}
+    ]
+  end
 
   def array_col?(col_name:)
     return true if col_name == 'area_list'
@@ -254,6 +255,7 @@ def array_table(col_name:)
 
   def join_tables
     sessions = Arel::Table.new(Session.table_name)
+    published_sessions = Arel::Table.new(PublishedSession.table_name)
 
     subquery = Session.area_list.as('areas_list')
     tags_subquery = Session.tags_list_table.as('tags_list_table')
@@ -286,6 +288,13 @@ def join_tables
         sessions.create_on(
           conflict_counts[:session_id].eq(sessions[:id])
         )
+      ),
+      sessions.create_join(
+        published_sessions,
+        sessions.create_on(
+          published_sessions[:session_id].eq(sessions[:id])
+        ),
+        Arel::Nodes::OuterJoin
       )
     ]
 
@@ -316,13 +325,14 @@ def join_tables
     joins
   end
 
-  def select_fields
+  def select_fields    
     Session.select(
       ::Session.arel_table[Arel.star],
       'conflict_counts.conflict_count',
       'areas_list.area_list',
       'tags_list_table.tags_array',
-      'labels_list_table.labels_array'
+      'labels_list_table.labels_array',
+      'published_sessions.session_id as is_published'
     )
   end
 

app/serializers/session_serializer.rb

@@ -129,7 +129,11 @@ class SessionSerializer
   end
 
   attribute :is_published do |session|
-    session.published?
+    if session.has_attribute?(:is_published)
+      session.is_published != nil
+    else
+      session.published?
+    end
   end
 
   has_many :session_areas, lazy_load_data: true, serializer: SessionAreaSerializer,