Fix performance on instances list in admin UI (#15282)

- Reduce duplicate queries
- Remove n+1 queries
- Add accounts count to detailed view
- Add separate action log entry for updating existing domain blocks

2 files changed, 8 insertions, 41 deletions

diff --git a/app/controllers/admin/domain_blocks_controller.rb b/app/controllers/admin/domain_blocks_controller.rb
index 74a36b79c..6a5b41a74 100644
--- a/app/controllers/admin/domain_blocks_controller.rb
+++ b/app/controllers/admin/domain_blocks_controller.rb
@@ -29,6 +29,7 @@ module Admin
           @domain_block = existing_domain_block
           @domain_block.update(resource_params)
         end
+
         if @domain_block.save
           DomainBlockWorker.perform_async(@domain_block.id)
           log_action :create, @domain_block
@@ -40,7 +41,7 @@ module Admin
     end
 
     def update
-      authorize :domain_block, :create?
+      authorize :domain_block, :update?
 
       @domain_block.update(update_params)
 
@@ -48,7 +49,7 @@ module Admin
 
       if @domain_block.save
         DomainBlockWorker.perform_async(@domain_block.id, severity_changed)
-        log_action :create, @domain_block
+        log_action :update, @domain_block
         redirect_to admin_instances_path(limited: '1'), notice: I18n.t('admin.domain_blocks.created_msg')
       else
         render :edit
diff --git a/app/controllers/admin/instances_controller.rb b/app/controllers/admin/instances_controller.rb
index 1790becbf..b5918d231 100644
--- a/app/controllers/admin/instances_controller.rb
+++ b/app/controllers/admin/instances_controller.rb
@@ -2,65 +2,31 @@
 
 module Admin
   class InstancesController < BaseController
-    before_action :set_domain_block, only: :show
-    before_action :set_domain_allow, only: :show
+    before_action :set_instances, only: :index
     before_action :set_instance, only: :show
 
     def index
       authorize :instance, :index?
-
-      @instances = ordered_instances
     end
 
     def show
       authorize :instance, :show?
-
-      @following_count = Follow.where(account: Account.where(domain: params[:id])).count
-      @followers_count = Follow.where(target_account: Account.where(domain: params[:id])).count
-      @reports_count   = Report.where(target_account: Account.where(domain: params[:id])).count
-      @blocks_count    = Block.where(target_account: Account.where(domain: params[:id])).count
-      @available       = DeliveryFailureTracker.available?(params[:id])
-      @media_storage   = MediaAttachment.where(account: Account.where(domain: params[:id])).sum(:file_file_size)
-      @private_comment = @domain_block&.private_comment
-      @public_comment  = @domain_block&.public_comment
     end
 
     private
 
-    def set_domain_block
-      @domain_block = DomainBlock.rule_for(params[:id])
-    end
-
-    def set_domain_allow
-      @domain_allow = DomainAllow.rule_for(params[:id])
-    end
-
     def set_instance
-      resource   = Account.by_domain_accounts.find_by(domain: params[:id])
-      resource ||= @domain_block
-      resource ||= @domain_allow
+      @instance = Instance.find(params[:id])
+    end
 
-      if resource
-        @instance = Instance.new(resource)
-      else
-        not_found
-      end
+    def set_instances
+      @instances = filtered_instances.page(params[:page])
     end
 
     def filtered_instances
       InstanceFilter.new(whitelist_mode? ? { allowed: true } : filter_params).results
     end
 
-    def paginated_instances
-      filtered_instances.page(params[:page])
-    end
-
-    helper_method :paginated_instances
-
-    def ordered_instances
-      paginated_instances.map { |resource| Instance.new(resource) }
-    end
-
     def filter_params
       params.slice(*InstanceFilter::KEYS).permit(*InstanceFilter::KEYS)
     end