Move filtered count to separate query, to improve performance for lar…

…ge inventories [SCI-11261] (#8090)

app/controllers/my_module_repositories_controller.rb

@@ -32,10 +32,10 @@ def index_dt
     }
 
     @all_rows_count = datatable_service.all_count
+    @filtered_rows_count = datatable_service.filtered_count
     @columns_mappings = datatable_service.mappings
     repository_rows = datatable_service.repository_rows
     @repository_rows = repository_rows.page(page).per(per_page)
-    @filtered_rows_count = @repository_rows.load.take&.filtered_count || 0
     render rows_view
   end
 
@@ -54,7 +54,7 @@ def assign_my_modules
         )
         unless service.succeed?
           status = :unprocessable_entity
-          raise ActiveRecord::Rollback 
+          raise ActiveRecord::Rollback
         end
         assigned_count += service.assigned_rows_count
         skipped_count += (params[:rows_to_assign].length - service.assigned_rows_count)

app/controllers/my_module_repository_snapshots_controller.rb

@@ -15,6 +15,7 @@ def index_dt
     datatable_service = RepositorySnapshotDatatableService.new(@repository_snapshot, params, current_user, @my_module)
 
     @all_rows_count = datatable_service.all_count
+    @filtered_rows_count = datatable_service.filtered_count
     @columns_mappings = datatable_service.mappings
     repository_rows = datatable_service.repository_rows
 
@@ -25,7 +26,6 @@ def index_dt
       rows_view = 'repository_rows/snapshot_index'
     end
     @repository_rows = repository_rows.page(page).per(per_page)
-    @filtered_rows_count = @repository_rows.load.take&.filtered_count || 0
     render rows_view
   end
 

app/controllers/my_module_shareable_links_controller.rb

@@ -73,10 +73,10 @@ def repository_index_dt
     }
 
     @all_rows_count = datatable_service.all_count
+    @filtered_rows_count = datatable_service.filtered_count
     @columns_mappings = datatable_service.mappings
 
     @repository_rows = datatable_service.repository_rows.page(page).per(per_page)
-    @filtered_rows_count = @repository_rows.load.take&.filtered_count || 0
 
     render 'repository_rows/simple_view_index'
   end
@@ -88,11 +88,11 @@ def repository_snapshot_index_dt
     datatable_service = RepositorySnapshotDatatableService.new(@repository_snapshot, params, nil, @my_module, preload_cells: false)
 
     @all_rows_count = datatable_service.all_count
+    @filtered_rows_count = datatable_service.filtered_count
     @columns_mappings = datatable_service.mappings
 
     @repository = @repository_snapshot
     @repository_rows = datatable_service.repository_rows.page(page).per(per_page)
-    @filtered_rows_count = @repository_rows.load.take&.filtered_count || 0
 
     render 'repository_rows/simple_view_index'
   end

app/controllers/repository_rows_controller.rb

@@ -27,11 +27,11 @@ def index
     datatable_service = RepositoryDatatableService.new(@repository, params, current_user)
 
     @all_rows_count = datatable_service.all_count
+    @filtered_rows_count = datatable_service.filtered_count
     @columns_mappings = datatable_service.mappings
     repository_rows = datatable_service.repository_rows
     repository_rows = repository_rows.where(archived: params[:archived]) unless @repository.archived?
     @repository_rows = repository_rows.page(page).per(per_page)
-    @filtered_rows_count = @repository_rows.load.take&.filtered_count || 0
   rescue RepositoryFilters::ColumnNotFoundException
     render json: { custom_error: I18n.t('repositories.show.repository_filter.errors.column_not_found') }
   rescue RepositoryFilters::ValueNotFoundException

app/services/repository_datatable_service.rb

@@ -8,7 +8,7 @@ class ValueNotFoundException < StandardError; end
 
 class RepositoryDatatableService
   include MyModulesHelper
-  attr_reader :repository_rows, :all_count, :mappings
+  attr_reader :repository_rows, :all_count, :filtered_count, :mappings
 
   PREDEFINED_COLUMNS = %w(row_id row_name added_on added_by archived_on archived_by
                           assigned relationships updated_on updated_by).freeze
@@ -144,14 +144,15 @@ def fetch_rows(search_value)
 
     repository_rows = repository_rows.where(id: advanced_search(repository_rows)) if @params[:advanced_search].present?
 
+    @filtered_count = repository_rows.count
+
     repository_rows.joins('LEFT OUTER JOIN "users" "created_by" ON "created_by"."id" = "repository_rows"."created_by_id"')
                    .joins('LEFT OUTER JOIN "users" "last_modified_by" ON "last_modified_by"."id" = "repository_rows"."last_modified_by_id"')
                    .joins('LEFT OUTER JOIN "users" "archived_by" ON "archived_by"."id" = "repository_rows"."archived_by_id"')
                    .select('repository_rows.*')
                    .select('MAX("created_by"."full_name") AS created_by_full_name')
                    .select('MAX("last_modified_by"."full_name") AS last_modified_by_full_name')
                    .select('MAX("archived_by"."full_name") AS archived_by_full_name')
-                   .select('COUNT("repository_rows"."id") OVER() AS filtered_count')
                    .group('repository_rows.id')
   end
 

app/services/repository_snapshot_datatable_service.rb

@@ -32,6 +32,7 @@ def fetch_rows(search_value)
     @all_count = repository_rows.count
 
     if search_value.present?
+      repository_rows = repository_rows.joins(:created_by)
       repository_row_matches = repository_rows.where_attributes_like(@repository.default_search_fileds, search_value)
       results = repository_rows.where(id: repository_row_matches)
 
@@ -45,7 +46,10 @@ def fetch_rows(search_value)
         results = results.or(repository_rows.where(id: custom_cell_matches))
       end
 
+      @filtered_count = results.count
       repository_rows = results
+    else
+      @filtered_count = @all_count
     end
 
     repository_rows.joins('LEFT OUTER JOIN "users" "created_by" ON "created_by"."id" = "repository_rows"."created_by_id"')