Merge branch 'an/network-controller-fix' into 'master'

Fix Gitaly n+1 in NetworkController#show

Closes #37602 and gitaly#1056

See merge request gitlab-org/gitlab-ce!17548

app/controllers/projects/network_controller.rb

@@ -9,25 +9,22 @@ class Projects::NetworkController < Projects::ApplicationController
   before_action :assign_commit
 
   def show
-    # n+1: https://gitlab.com/gitlab-org/gitlab-ce/issues/37602
-    Gitlab::GitalyClient.allow_n_plus_1_calls do
-      @url = project_network_path(@project, @ref, @options.merge(format: :json))
-      @commit_url = project_commit_path(@project, 'ae45ca32').gsub("ae45ca32", "%s")
+    @url = project_network_path(@project, @ref, @options.merge(format: :json))
+    @commit_url = project_commit_path(@project, 'ae45ca32').gsub("ae45ca32", "%s")
 
-      respond_to do |format|
-        format.html do
-          if @options[:extended_sha1] && !@commit
-            flash.now[:alert] = "Git revision '#{@options[:extended_sha1]}' does not exist."
-          end
-        end
-
-        format.json do
-          @graph = Network::Graph.new(project, @ref, @commit, @options[:filter_ref])
+    respond_to do |format|
+      format.html do
+        if @options[:extended_sha1] && !@commit
+          flash.now[:alert] = "Git revision '#{@options[:extended_sha1]}' does not exist."
         end
       end
 
-      render
+      format.json do
+        @graph = Network::Graph.new(project, @ref, @commit, @options[:filter_ref])
+      end
     end
+
+    render
   end
 
   def assign_commit

app/models/network/commit.rb

@@ -24,12 +24,7 @@ module Network
     end
 
     def parents(map)
-      @commit.parents.map do |p|
-        if map.include?(p.id)
-          map[p.id]
-        end
-      end
-      .compact
+      map.values_at(*@commit.parent_ids).compact
     end
   end
 end

changelogs/unreleased/an-network-controller-fix.yml

@@ -0,0 +1,5 @@
+---
+title: Prevent the graphs page from generating unnecessary Gitaly requests
+merge_request: 37602
+author:
+type: performance