diff options
Diffstat (limited to 'db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb')
-rw-r--r-- | db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb b/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb new file mode 100644 index 00000000000..8b2cc40ee59 --- /dev/null +++ b/db/migrate/20170622135728_add_unique_constraint_to_ci_variables.rb @@ -0,0 +1,38 @@ +class AddUniqueConstraintToCiVariables < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + + disable_ddl_transaction! + + def up + unless this_index_exists? + add_concurrent_index(:ci_variables, columns, name: index_name, unique: true) + end + end + + def down + if this_index_exists? + if Gitlab::Database.mysql? && !index_exists?(:ci_variables, :project_id) + # Need to add this index for MySQL project_id foreign key constraint + add_concurrent_index(:ci_variables, :project_id) + end + + remove_concurrent_index(:ci_variables, columns, name: index_name) + end + end + + private + + def this_index_exists? + index_exists?(:ci_variables, columns, name: index_name) + end + + def columns + @columns ||= [:project_id, :key, :environment_scope] + end + + def index_name + 'index_ci_variables_on_project_id_and_key_and_environment_scope' + end +end |