change *_count methods to use delegate to save lines in map.rb model

app/models/map.rb

@@ -34,6 +34,13 @@ class Map < ApplicationRecord
 
   after_save :update_deferring_topics_and_synapses, if: :permission_changed?
 
+  delegate :count, to: :topics, prefix: :topic # same as `def topic_count; topics.count; end`
+  delegate :count, to: :synapses, prefix: :synapse
+  delegate :count, to: :contributors, prefix: :contributor
+  delegate :count, to: :stars, prefix: :star
+
+  delegate :name, to: :user, prefix: true
+
   def mappings
     topicmappings.or(synapsemappings)
   end
@@ -46,28 +53,10 @@ class Map < ApplicationRecord
     User.where(id: user_id).or(User.where(id: collaborators))
   end
 
-  def topic_count
-    topics.length
-  end
-
-  def synapse_count
-    synapses.length
-  end
-
-  delegate :name, to: :user, prefix: true
-
   def user_image
     user.image.url(:thirtytwo)
   end
 
-  def contributor_count
-    contributors.length
-  end
-
-  def star_count
-    stars.length
-  end
-
   def collaborator_ids
     collaborators.map(&:id)
   end