Address performance of #3799 by using activity summary table instead …

…of deeds

app/controllers/dashboard_controller.rb

@@ -114,7 +114,7 @@ def summary
   # Collaborator Dashboard - watchlist
   def watchlist
     works = Work.joins(:deeds).where(deeds: { user_id: current_user.id }).distinct
-    collections = Collection.joins(:deeds).where(deeds: { user_id: current_user.id }).distinct.order_by_recent_activity.limit(5)
+    collections = Collection.where(id: current_user.ahoy_activity_summaries.pluck(:collection_id)).distinct.order_by_recent_activity.limit(5)
     document_sets = DocumentSet.joins(works: :deeds).where(works: { id: works.ids }).order('deeds.created_at DESC').distinct.limit(5)
     collections_list(true) # assigns @collections_and_document_sets for private collections only
     @collections = (collections + document_sets).sort { |a, b| a.title <=> b.title }.take(5)

app/models/collection.rb

@@ -36,6 +36,7 @@ class Collection < ApplicationRecord
   has_and_belongs_to_many :owners, :class_name => 'User', :join_table => :collection_owners
   has_and_belongs_to_many :collaborators, :class_name => 'User', :join_table => :collection_collaborators
   has_and_belongs_to_many :reviewers, :class_name => 'User', :join_table => :collection_reviewers
+  has_many :ahoy_activity_summaries
 
   validates :title, presence: true, length: { minimum: 3, maximum: 255 }
   validates :slug, format: { with: /[[:alpha:]]/ }

app/models/user.rb

@@ -30,6 +30,7 @@ class User < ApplicationRecord
 
   has_many :collection_blocks, dependent: :destroy
   has_many :blocked_collections, through: :collection_blocks, source: :collection
+  has_many :ahoy_activity_summaries
 
   has_and_belongs_to_many(:scribe_works,
                           :join_table => 'transcribe_authorizations',