From 7f034cf429ccd3707669db20ade0f6776306fe7f Mon Sep 17 00:00:00 2001
From: Thibaut Girka <thib@sitedethib.com>
Date: Mon, 10 Feb 2020 19:03:14 +0100
Subject: [PATCH] Fix ActiveRecord::Migration.check_pending! failing because of
 duplicate migrations

---
 config/initializers/0_duplicate_migrations.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/config/initializers/0_duplicate_migrations.rb b/config/initializers/0_duplicate_migrations.rb
index 4ab806587e..194aff70cb 100644
--- a/config/initializers/0_duplicate_migrations.rb
+++ b/config/initializers/0_duplicate_migrations.rb
@@ -37,4 +37,16 @@ module ActiveRecord
       super(direction, migrations, target_version)
     end
   end
+
+  class MigrationContext
+    def needs_migration?
+      # A set of duplicated migrations is considered migrated if at least one of
+      # them is migrated.
+      migrated = get_all_versions
+      migrations.group_by(&:name).each do |name, duplicates|
+        return true unless duplicates.any? { |m| migrated.include?(m.version.to_i) }
+      end
+      return false
+    end
+  end
 end