id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	work_issues	upstream	reviewer	author	merged	dependencies	stopgaps
3913	[with patch, positive review] order function not defined for ideal classes	cremona	was	"In 3.1 you can't ask for the order of an ideal class.  Example:
{{{
sage: K.<w>=QuadraticField(-23)
sage: OK=K.ring_of_integers()
sage: C=OK.class_group()
sage: h=C.order()
sage: P2a,P2b=[P for P,e in (2*OK).factor()]
sage: c=C(P2a); c
Fractional ideal class (2, 1/2*w - 1/2)
sage: c.order()
#boom
}}}

This is easily provided:
{{{
sage: sage.groups.generic.order_from_multiple(c,c.parent().order(),operation='*')
3
}}}

Patch coming up.
"	enhancement	closed	minor	sage-3.1.2	number theory	fixed		AlexGhitza