From 400db5803633c92cf5ac0adf1ec7de32211aedea Mon Sep 17 00:00:00 2001
From: Andy Allan <git@gravitystorm.co.uk>
Date: Wed, 23 Jan 2019 18:12:30 +0100
Subject: [PATCH] Use activerecord-import for bulk importing tracepoint records

Non-rigourous testing shows a significant speedup, even on ssds.
---
 Gemfile                   |  1 +
 Gemfile.lock              |  3 +++
 app/models/trace.rb       | 11 ++++++++++-
 test/models/trace_test.rb |  4 ++++
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/Gemfile b/Gemfile
index 372b7d021..83f298101 100644
--- a/Gemfile
+++ b/Gemfile
@@ -46,6 +46,7 @@ gem "image_optim_rails"
 # Load rails plugins
 gem "actionpack-page_caching"
 gem "active_record_union"
+gem "activerecord-import"
 gem "cancancan"
 gem "composite_primary_keys", "~> 11.1.0"
 gem "config"
diff --git a/Gemfile.lock b/Gemfile.lock
index 2b5cc1dd5..57feba1fd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -40,6 +40,8 @@ GEM
       activemodel (= 5.2.2.1)
       activesupport (= 5.2.2.1)
       arel (>= 9.0)
+    activerecord-import (0.28.1)
+      activerecord (>= 3.2)
     activestorage (5.2.2.1)
       actionpack (= 5.2.2.1)
       activerecord (= 5.2.2.1)
@@ -423,6 +425,7 @@ DEPENDENCIES
   aasm
   actionpack-page_caching
   active_record_union
+  activerecord-import
   annotate
   autoprefixer-rails (~> 8.6.3)
   better_errors
diff --git a/app/models/trace.rb b/app/models/trace.rb
index 892d41a2a..bd8ab72b3 100644
--- a/app/models/trace.rb
+++ b/app/models/trace.rb
@@ -289,6 +289,8 @@ class Trace < ActiveRecord::Base
     # If there are any existing points for this trace then delete them
     Tracepoint.where(:gpx_id => id).delete_all
 
+    # Gather the trace points together for a bulk import
+    tracepoints = []
     gpx.points do |point|
       if first
         f_lat = point.latitude
@@ -303,9 +305,16 @@ class Trace < ActiveRecord::Base
       tp.timestamp = point.timestamp
       tp.gpx_id = id
       tp.trackid = point.segment
-      tp.save!
+      tracepoints << tp
     end
 
+    # Run the before_save and before_create callbacks, and then import them in bulk with activerecord-import
+    tracepoints.each do |tp|
+      tp.run_callbacks(:save) { false }
+      tp.run_callbacks(:create) { false }
+    end
+    Tracepoint.import(tracepoints)
+
     if gpx.actual_points.positive?
       max_lat = Tracepoint.where(:gpx_id => id).maximum(:latitude)
       min_lat = Tracepoint.where(:gpx_id => id).minimum(:latitude)
diff --git a/test/models/trace_test.rb b/test/models/trace_test.rb
index f03488a61..81120f0e7 100644
--- a/test/models/trace_test.rb
+++ b/test/models/trace_test.rb
@@ -206,6 +206,10 @@ class TraceTest < ActiveSupport::TestCase
 
       trace.reload
       assert_equal 1, Tracepoint.where(:gpx_id => trace.id).count
+
+      # Check that the tile has been set prior to the bulk import
+      # i.e. that the callbacks have been run correctly
+      assert_equal 3221331576, Tracepoint.where(:gpx_id => trace.id).first.tile
     end
   end
 
-- 
2.43.2