Enhance performance when filter Destinations by rateplan id

app/admin/routing/destinations.rb

@@ -52,16 +52,16 @@
   acts_as_import resource_class: Importing::Destination,
                  skip_columns: [:routing_tag_ids]
 
-  scope :low_quality
-  scope :time_valid
+  scope :low_quality, show_count: false
+  scope :time_valid, show_count: false
 
   filter :id
   filter :uuid_equals, label: 'UUID'
   filter :enabled, as: :select, collection: [['Yes', true], ['No', false]]
   filter :prefix
   filter :routing_for_contains, as: :string, input_html: { class: 'search_filter_string' }
   filter :rate_group, input_html: { class: 'chosen' }
-  filter :rate_group_rateplans_id_eq, as: :select, input_html: { class: 'chosen' }, label: 'Rateplan', collection: -> { Routing::Rateplan.all }
+  filter :rateplan_id_filter, as: :select, input_html: { class: 'chosen' }, label: 'Rateplan', collection: -> { Routing::Rateplan.all }
   filter :reject_calls, as: :select, collection: [['Yes', true], ['No', false]]
   filter :initial_rate
   filter :next_rate

app/models/class4/rate_plan_group.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: class4.rate_plan_groups
+#
+#  id            :integer(4)       not null, primary key
+#  rate_group_id :integer(4)       not null
+#  rateplan_id   :integer(4)       not null
+#
+# Indexes
+#
+#  rate_plan_groups_rateplan_id_rate_group_id_idx  (rateplan_id,rate_group_id) UNIQUE
+#
+# Foreign Keys
+#
+#  rate_plan_groups_rate_group_id_fkey  (rate_group_id => rate_groups.id)
+#  rate_plan_groups_rateplan_id_fkey    (rateplan_id => rateplans.id)
+#
+module Class4
+  class RatePlanGroup < ApplicationRecord
+    self.table_name = 'class4.rate_plan_groups'
+  end
+end

app/models/routing/destination.rb

@@ -69,6 +69,10 @@ class Routing::Destination < ApplicationRecord
 
   scope :low_quality, -> { where quality_alarm: true }
   scope :time_valid, -> { where('valid_till >= :time AND valid_from < :time', time: Time.now) }
+  scope :rateplan_id_filter, ->(value) do
+    rate_group_ids = Class4::RatePlanGroup.where(rateplan_id: value).pluck(:rate_group_id)
+    where('rate_group_id IN (?)', rate_group_ids)
+  end
 
   scope :where_customer, lambda { |id|
     joins(:rate_group).joins(:rateplans).joins(:customers_auths).where(CustomersAuth.table_name => { customer_id: id })
@@ -171,6 +175,7 @@ def self.ransackable_scopes(_auth_object = nil)
       routing_tag_ids_covers
       tagged
       routing_tag_ids_count_equals
+      rateplan_id_filter
     ]
   end
 end