Fix summary query to leverage ActsAsTenant scopes

Gemfile

@@ -23,6 +23,7 @@ gem 'rubytree'
 gem 'acts_as_tenant'
 gem 'httparty'
 gem 'rswag'
+gem 'pluck_to_hash'
 
 group :development, :test do
   gem 'annotaterb'

Gemfile.lock

@@ -222,6 +222,9 @@ GEM
       ast (~> 2.4.1)
       racc
     pg (1.5.9)
+    pluck_to_hash (1.0.2)
+      activerecord (>= 4.0.2)
+      activesupport (>= 4.0.2)
     pry (0.15.0)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -413,6 +416,7 @@ DEPENDENCIES
   license_finder
   money
   pg (~> 1.1)
+  pluck_to_hash
   pry
   puma (>= 5.0)
   rack-cors

app/queries/groups/summary_query.rb

@@ -3,29 +3,19 @@
 module Groups
   class SummaryQuery
     def call
-      ActiveRecord::Base.connection.execute(query).to_a
-    end
-
-    private
-
-    def query
-      <<~SQL.squish
-        SELECT
-          groups.id,
-          groups.name,
-          groups.icon,
-          groups.parent_id,
-          groups.color,
-          count(*) filter (where status IS NOT NULL) as total,
-          count(*) filter (where status = 0) as considered,
-          count(*) filter (where status = 10) as invited,
-          count(*) filter (where status = 20) as confirmed,
-          count(*) filter (where status = 30) as declined,
-          count(*) filter (where status = 40) as tentative
-        FROM groups
-        LEFT JOIN guests on groups.id = guests.group_id
-        GROUP BY groups.id
-      SQL
+      Group.left_joins(:guests).group(:id).pluck_to_hash(
+        :id,
+        :name,
+        :icon,
+        :parent_id,
+        :color,
+        Arel.sql('count(*) filter (where status IS NOT NULL) as total'),
+        Arel.sql('count(*) filter (where status = 0) as considered'),
+        Arel.sql('count(*) filter (where status = 10) as invited'),
+        Arel.sql('count(*) filter (where status = 20) as confirmed'),
+        Arel.sql('count(*) filter (where status = 30) as declined'),
+        Arel.sql('count(*) filter (where status = 40) as tentative'),
+      )
     end
   end
 end