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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 TurnIssuesDueDateIndexToPartialIndex < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
NEW_INDEX_NAME = 'idx_issues_on_project_id_and_due_date_and_id_and_state_partial'
OLD_INDEX_NAME = 'index_issues_on_project_id_and_due_date_and_id_and_state'
disable_ddl_transaction!
def up
add_concurrent_index(
:issues,
[:project_id, :due_date, :id, :state],
where: 'due_date IS NOT NULL',
name: NEW_INDEX_NAME
)
# We set the column name to nil as otherwise Rails will ignore the custom
# index name and remove the wrong index.
remove_concurrent_index(:issues, nil, name: OLD_INDEX_NAME)
end
def down
add_concurrent_index(
:issues,
[:project_id, :due_date, :id, :state],
name: OLD_INDEX_NAME
)
remove_concurrent_index(:issues, nil, name: NEW_INDEX_NAME)
end
end
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