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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class AddCompositeIndexOnMergeRequestsMergeCommitSha < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
# The default index name is too long for PostgreSQL and would thus be
# truncated.
INDEX_NAME = 'index_merge_requests_on_tp_id_and_merge_commit_sha_and_id'
COLUMNS = [:target_project_id, :merge_commit_sha, :id]
disable_ddl_transaction!
def up
return if index_is_present?
add_concurrent_index(:merge_requests, COLUMNS, name: INDEX_NAME)
end
def down
return unless index_is_present?
remove_concurrent_index(:merge_requests, COLUMNS, name: INDEX_NAME)
end
def index_is_present?
index_exists?(:merge_requests, COLUMNS, name: INDEX_NAME)
end
end
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