Adjust MySQL limits for existing installations

CHANGELOG

@@ -18,6 +18,7 @@ v 6.8.0
   - Expose event and mergerequest timestamps in API
   - Fix emails on push service when only one commit is pushed
   - Store Rails cache data in the Redis `cache:gitlab` namespace
+  - Adjust MySQL limits for existing installations
 
 v 6.7.3
   - Fix the merge notification email not being sent (Pierre de La Morinerie)

db/migrate/20140415124820_limits_to_mysql.rb

+require_relative 'limits_to_mysql'

db/migrate/limits_to_mysql.rb

+class LimitsToMysql < ActiveRecord::Migration
+  def up
+    return unless ActiveRecord::Base.configurations[Rails.env]['adapter'] == 'mysql2'
+
+    change_column :merge_request_diffs, :st_commits, :text, limit: 2147483647
+    change_column :merge_request_diffs, :st_diffs, :text, limit: 2147483647
+    change_column :snippets, :content, :text, limit: 2147483647
+    change_column :notes, :st_diff, :text, limit: 2147483647
+  end
+end

lib/tasks/migrate/add_limits_mysql.rake

+require Rails.root.join('db/migrate/limits_to_mysql')
+
 desc "GITLAB | Add limits to strings in mysql database"
 task add_limits_mysql: :environment do
   puts "Adding limits to schema.rb for mysql"
   LimitsToMysql.new.up
 end
-
-class LimitsToMysql < ActiveRecord::Migration
-  def up
-    change_column :merge_request_diffs, :st_commits, :text, limit: 2147483647
-    change_column :merge_request_diffs, :st_diffs, :text, limit: 2147483647
-    change_column :snippets, :content, :text, limit: 2147483647
-    change_column :notes, :st_diff, :text, limit: 2147483647
-  end
-end