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class AddUniqueConstraintToCiVariables < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
INDEX_NAME = 'index_ci_variables_on_project_id_and_key_and_environment_scope'
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
end
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