From 5eaf52d0c913e9cd74e8a85349a4589ce602e2a4 Mon Sep 17 00:00:00 2001
From: Yorick Peterse <yorickpeterse@gmail.com>
Date: Sun, 20 Aug 2017 12:12:10 +0000
Subject: Merge branch 'sh-fix-protected-tags-delete' into 'master'

Fix Error 500s when attempting to destroy a protected tag

Closes #36013

See merge request !13692
---
 ...20100558_correct_protected_tags_foreign_keys.rb | 35 ++++++++++++++++++++++
 db/schema.rb                                       |  4 +--
 lib/gitlab/database/migration_helpers.rb           |  5 ++++
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb

diff --git a/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
new file mode 100644
index 00000000000..229298e1946
--- /dev/null
+++ b/db/migrate/20170820100558_correct_protected_tags_foreign_keys.rb
@@ -0,0 +1,35 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class CorrectProtectedTagsForeignKeys < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_foreign_key_without_error(:protected_tag_create_access_levels,
+                                     column: :protected_tag_id)
+
+    execute <<-EOF
+    DELETE FROM protected_tag_create_access_levels
+    WHERE NOT EXISTS (
+      SELECT true
+      FROM protected_tags
+      WHERE protected_tag_create_access_levels.protected_tag_id = protected_tags.id
+    )
+    AND protected_tag_id IS NOT NULL
+    EOF
+
+    add_concurrent_foreign_key(:protected_tag_create_access_levels,
+                               :protected_tags,
+                               column: :protected_tag_id)
+  end
+
+  def down
+    # Previously there was a foreign key without a CASCADING DELETE, so we'll
+    # just leave the foreign key in place.
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index afab9cd857f..2ccf52b7b74 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170815060945) do
+ActiveRecord::Schema.define(version: 20170820100558) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1725,7 +1725,7 @@ ActiveRecord::Schema.define(version: 20170815060945) do
   add_foreign_key "protected_branch_push_access_levels", "protected_branches", name: "fk_9ffc86a3d9", on_delete: :cascade
   add_foreign_key "protected_branches", "projects", name: "fk_7a9c6d93e7", on_delete: :cascade
   add_foreign_key "protected_tag_create_access_levels", "namespaces", column: "group_id"
-  add_foreign_key "protected_tag_create_access_levels", "protected_tags"
+  add_foreign_key "protected_tag_create_access_levels", "protected_tags", name: "fk_f7dfda8c51", on_delete: :cascade
   add_foreign_key "protected_tag_create_access_levels", "users"
   add_foreign_key "protected_tags", "projects", name: "fk_8e4af87648", on_delete: :cascade
   add_foreign_key "push_event_payloads", "events_for_migration", column: "event_id", name: "fk_36c74129da", on_delete: :cascade
diff --git a/lib/gitlab/database/migration_helpers.rb b/lib/gitlab/database/migration_helpers.rb
index 69ca9aa596b..b83e633c7ed 100644
--- a/lib/gitlab/database/migration_helpers.rb
+++ b/lib/gitlab/database/migration_helpers.rb
@@ -606,6 +606,11 @@ module Gitlab
           Arel::Nodes::SqlLiteral.new(replace.to_sql)
         end
       end
+
+      def remove_foreign_key_without_error(*args)
+        remove_foreign_key(*args)
+      rescue ArgumentError
+      end
     end
   end
 end
-- 
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