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=====================
Subscription services
=====================
The `ISubscriptionService` utility provides higher level convenience methods
useful for searching, retrieving, iterating, adding, and removing
memberships.
>>> from mailman.interfaces.subscriptions import ISubscriptionService
>>> from zope.component import getUtility
>>> service = getUtility(ISubscriptionService)
You can use the service to get all members of all mailing lists, for any
membership role. At first, there are no memberships.
>>> service.get_members()
[]
>>> sum(1 for member in service)
0
>>> print service.get_member(801)
None
The service can be used to subscribe new members, but only with the `member`
role. At a minimum, a mailing list and an address for the new user is
required.
>>> mlist = create_list('test@example.com')
>>> anne = service.join('test@example.com', 'anne@example.com')
>>> anne
<Member: anne <anne@example.com> on test@example.com as MemberRole.member>
The real name of the new member can be given.
>>> bart = service.join('test@example.com', 'bart@example.com',
... 'Bart Person')
>>> bart
<Member: Bart Person <bart@example.com>
on test@example.com as MemberRole.member>
Other roles can be subscribed using the more traditional interfaces.
>>> from mailman.interfaces.member import MemberRole
>>> from mailman.utilities.datetime import now
>>> address = list(anne.user.addresses)[0]
>>> address.verified_on = now()
>>> anne.user.preferred_address = address
>>> anne_owner = mlist.subscribe(anne.user, MemberRole.owner)
And all the subscribed members can now be displayed.
>>> service.get_members()
[<Member: anne <anne@example.com> on test@example.com as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.member>,
<Member: Bart Person <bart@example.com> on test@example.com
as MemberRole.member>]
>>> sum(1 for member in service)
3
>>> print service.get_member(3)
<Member: anne <anne@example.com> on test@example.com as MemberRole.owner>
Regular members can also be removed.
>>> service.leave('test@example.com', 'anne@example.com')
>>> service.get_members()
[<Member: anne <anne@example.com> on test@example.com as MemberRole.owner>,
<Member: Bart Person <bart@example.com> on test@example.com
as MemberRole.member>]
>>> sum(1 for member in service)
2
Finding members
===============
If you know the member id for a specific member, you can get that member.
>>> service.get_member(3)
<Member: anne <anne@example.com> on test@example.com as MemberRole.owner>
If you know the member's address, you can find all their memberships, based on
specific search criteria.
::
>>> mlist2 = create_list('foo@example.com')
>>> mlist3 = create_list('bar@example.com')
>>> mlist.subscribe(anne.user, MemberRole.member)
<Member: anne <anne@example.com> on test@example.com as MemberRole.member>
>>> mlist.subscribe(anne.user, MemberRole.moderator)
<Member: anne <anne@example.com> on test@example.com
as MemberRole.moderator>
>>> mlist2.subscribe(anne.user, MemberRole.member)
<Member: anne <anne@example.com> on foo@example.com as MemberRole.member>
>>> mlist3.subscribe(anne.user, MemberRole.owner)
<Member: anne <anne@example.com> on bar@example.com as MemberRole.owner>
>>> service.find_members('anne@example.com')
[<Member: anne <anne@example.com> on bar@example.com as MemberRole.owner>,
<Member: anne <anne@example.com> on foo@example.com as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.moderator>]
There may be no matching memberships.
>>> service.find_members('cris@example.com')
[]
Memberships can also be searched for by user id.
>>> service.find_members(1)
[<Member: anne <anne@example.com> on bar@example.com as MemberRole.owner>,
<Member: anne <anne@example.com> on foo@example.com as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.moderator>]
You can find all the memberships for a specific mailing list.
>>> service.find_members(fqdn_listname='test@example.com')
[<Member: anne <anne@example.com> on test@example.com
as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.moderator>,
<Member: Bart Person <bart@example.com> on test@example.com
as MemberRole.member>]
You can find all the memberships for an address on a specific mailing list.
>>> service.find_members('anne@example.com', 'test@example.com')
[<Member: anne <anne@example.com> on test@example.com
as MemberRole.member>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.moderator>]
You can find all the memberships for an address with a specific role.
>>> service.find_members('anne@example.com', role=MemberRole.owner)
[<Member: anne <anne@example.com> on bar@example.com as MemberRole.owner>,
<Member: anne <anne@example.com> on test@example.com
as MemberRole.owner>]
You can also find a specific membership by all three criteria.
>>> service.find_members('anne@example.com', 'test@example.com',
... MemberRole.owner)
[<Member: anne <anne@example.com> on test@example.com
as MemberRole.owner>]
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