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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 CreateIssueAssigneesTable < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
INDEX_NAME = 'index_issue_assignees_on_issue_id_and_user_id'
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
# When a migration requires downtime you **must** uncomment the following
# constant and define a short and easy to understand explanation as to why the
# migration requires downtime.
# DOWNTIME_REASON = ''
# When using the methods "add_concurrent_index" or "add_column_with_default"
# you must disable the use of transactions as these methods can not run in an
# existing transaction. When using "add_concurrent_index" make sure that this
# method is the _only_ method called in the migration, any other changes
# should go in a separate migration. This ensures that upon failure _only_ the
# index creation fails and can be retried or reverted easily.
#
# To disable transactions uncomment the following line and remove these
# comments:
# disable_ddl_transaction!
def up
create_table :issue_assignees, id: false do |t|
t.references :user, foreign_key: { on_delete: :cascade }, index: true, null: false
t.references :issue, foreign_key: { on_delete: :cascade }, null: false
end
add_index :issue_assignees, [:issue_id, :user_id], unique: true, name: INDEX_NAME
end
def down
drop_table :issue_assignees
end
end
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