Commit 718ecd4e authored by Stan Hu's avatar Stan Hu

Fix Error 500s when attempting to destroy a protected tag

Due to a missing `on_delete: :cascade`, users would hit the error that
looked like:

```
PG::ForeignKeyViolation: ERROR: update or delete on table "protected_tags"
violates foreign key constraint "fk_rails_f7dfda8c51" on table
"protected_tag_create_access_levels" DETAIL: Key (id)=(1385) is still
referenced from table "protected_tag_create_access_levels". : DELETE FROM
"protected_tags" WHERE "protected_tags"."id" = 1385
```

Closes #36013
parent 84336b84
# 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
......@@ -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"
......@@ -1726,7 +1726,7 @@ 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
......
......@@ -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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