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group.py
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group.py
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import datetime
from meta import *
from core import *
from sqlalchemy.orm import eagerload_all
from domain_object import DomainObject
from package import *
from types import make_uuid
import vdm.sqlalchemy
from ckan.model import extension, User
from sqlalchemy.ext.associationproxy import association_proxy
import sqlalchemy as sa
__all__ = ['group_table', 'Group', 'package_revision_table',
'Member', 'GroupRevision', 'MemberRevision',
'member_revision_table', 'member_table']
member_table = Table('member', metadata,
Column('id', UnicodeText, primary_key=True, default=make_uuid),
Column('table_name', UnicodeText, nullable=False),
Column('table_id', UnicodeText, nullable=False),
Column('capacity', UnicodeText, nullable=False),
Column('group_id', UnicodeText, ForeignKey('group.id')),
)
vdm.sqlalchemy.make_table_stateful(member_table)
member_revision_table = make_revisioned_table(member_table)
group_table = Table('group', metadata,
Column('id', UnicodeText, primary_key=True, default=make_uuid),
Column('name', UnicodeText, nullable=False, unique=True),
Column('title', UnicodeText),
Column('type', UnicodeText, nullable=False),
Column('description', UnicodeText),
Column('image_url', UnicodeText),
Column('created', DateTime, default=datetime.datetime.now),
Column('approval_status', UnicodeText, default=u"approved"),
)
vdm.sqlalchemy.make_table_stateful(group_table)
group_revision_table = make_revisioned_table(group_table)
class Member(vdm.sqlalchemy.RevisionedObjectMixin,
vdm.sqlalchemy.StatefulObjectMixin,
DomainObject):
def __init__(self, group=None, table_id=None, group_id=None,
table_name=None, capacity='public', state='active'):
self.group = group
self.group_id = group_id
self.table_id = table_id
self.table_name = table_name
self.capacity = capacity
self.state = state
@classmethod
def get(cls, reference):
'''Returns a group object referenced by its id or name.'''
query = Session.query(cls).filter(cls.id==reference)
member = query.first()
if member == None:
member = cls.by_name(reference)
return member
def get_related(self, type):
""" TODO: Determine if this is useful
Get all objects that are members of the group of the specified type.
Should the type be used to get table_name or should we use the one in
the constructor
"""
pass
def related_packages(self):
# TODO do we want to return all related packages or certain ones?
return Session.query(Package).filter_by(id=self.table_id).all()
class Group(vdm.sqlalchemy.RevisionedObjectMixin,
vdm.sqlalchemy.StatefulObjectMixin,
DomainObject):
def __init__(self, name=u'', title=u'', description=u'', image_url=u'',
type=u'group', approval_status=u'approved'):
self.name = name
self.title = title
self.description = description
self.image_url = image_url
self.type = type
self.approval_status= approval_status
@property
def display_name(self):
if self.title is not None and len(self.title):
return self.title
else:
return self.name
@classmethod
def get(cls, reference):
'''Returns a group object referenced by its id or name.'''
query = Session.query(cls).filter(cls.id==reference)
group = query.first()
if group == None:
group = cls.by_name(reference)
return group
# Todo: Make sure group names can't be changed to look like group IDs?
@classmethod
def all(cls, group_type=None, state=('active',)):
"""
Returns all groups.
"""
q = Session.query(cls)
if state:
q = q.filter(cls.state.in_(state))
if group_type:
q = q.filter(cls.type==group_type)
return q.order_by(cls.title)
def set_approval_status(self, status):
"""
Aproval status can be set on a group, where currently it does
nothing other than act as an indication of whether it was
approved or not. It may be that we want to tie the object
status to the approval status
"""
assert status in ["approved", "pending", "denied"]
self.approval_status = status
if status == "denied":
pass
def members_of_type(self, object_type, capacity=None):
from ckan import model
object_type_string = object_type.__name__.lower()
query = Session.query(object_type).\
filter(model.Group.id == self.id).\
filter(model.Member.state == 'active').\
filter(model.Member.table_name == object_type_string)
if hasattr(object_type,'state'):
query = query.filter(object_type.state == 'active' )
if capacity:
query = query.filter(model.Member.capacity == capacity)
query = query.join(model.Member, member_table.c.table_id == getattr(object_type,'id') ).\
join(model.Group, group_table.c.id == member_table.c.group_id)
return query
def add_child(self, object_instance):
object_type_string = object_instance.__class__.__name__.lower()
if not object_instance in self.members_of_type(object_instance.__class__).all():
member = Member(group=self, table_id=getattr(object_instance,'id'), table_name=object_type_string)
Session.add(member)
def get_children_groups(self, type='group'):
# Returns a list of dicts where each dict contains "id", "name", and "title"
# When querying with a CTE specifying a model in the query parameter causes
# problems as it returns only the first level deep apparently not recursing
# any deeper than that. If we simplify and request only specific fields then
# if returns the full depth of the hierarchy.
results = Session.query("id","name", "title").\
from_statement(HIERARCHY_CTE).params(id=self.id, type=type).all()
return [ { "id":idf, "name": name, "title": title } for idf,name,title in results ]
def active_packages(self, load_eager=True, with_private=False):
query = Session.query(Package).\
filter_by(state=vdm.sqlalchemy.State.ACTIVE).\
filter(group_table.c.id == self.id).\
filter(member_table.c.state == 'active')
if not with_private:
query = query.filter(member_table.c.capacity == 'public')
query = query.join(member_table, member_table.c.table_id == Package.id).\
join(group_table, group_table.c.id == member_table.c.group_id)
return query
@classmethod
def search_by_name_or_title(cls, text_query, group_type=None):
text_query = text_query.strip().lower()
q = Session.query(cls) \
.filter(sa.or_(cls.name.contains(text_query),
cls.title.ilike('%' + text_query + '%')))
if group_type:
q = q.filter(cls.type==group_type)
return q.order_by(cls.title)
def as_dict(self, ref_package_by='name'):
_dict = DomainObject.as_dict(self)
_dict['packages'] = [getattr(package, ref_package_by) for package in self.packages]
_dict['extras'] = dict([(key, value) for key, value in self.extras.items()])
if ( self.type == 'organization' ):
_dict['users'] = [getattr(user, "name") for user in self.members_of_type(User)]
return _dict
def add_package_by_name(self, package_name):
if not package_name:
return
package = Package.by_name(package_name)
assert package
if not package in self.members_of_type( package.__class__ ).all():
member = Member(group=self, table_id=package.id, table_name='package')
Session.add(member)
def get_groups(self, group_type=None, capacity=None):
""" Get all groups that this group is within """
import ckan.model as model
if '_groups' not in self.__dict__:
self._groups = model.Session.query(model.Group).\
join(model.Member, model.Member.group_id == model.Group.id and \
model.Member.table_name == 'group').\
filter(model.Member.state == 'active').\
filter(model.Member.table_id == self.id).all()
groups = self._groups
if group_type:
groups = [g for g in groups if g.type == group_type]
if capacity:
groups = [g for g in groups if g.capacity == capacity]
return groups
@property
def all_related_revisions(self):
'''Returns chronological list of all object revisions related to
this group. Ordered by most recent first.
'''
results = {}
from group_extra import GroupExtra
for grp_rev in self.all_revisions:
if not results.has_key(grp_rev.revision):
results[grp_rev.revision] = []
results[grp_rev.revision].append(grp_rev)
for class_ in [Member, GroupExtra]:
rev_class = class_.__revision_class__
obj_revisions = Session.query(rev_class).filter_by(group_id=self.id).all()
for obj_rev in obj_revisions:
if not results.has_key(obj_rev.revision):
results[obj_rev.revision] = []
results[obj_rev.revision].append(obj_rev)
result_list = results.items()
ourcmp = lambda rev_tuple1, rev_tuple2: \
cmp(rev_tuple2[0].timestamp, rev_tuple1[0].timestamp)
return sorted(result_list, cmp=ourcmp)
def __repr__(self):
return '<Group %s>' % self.name
mapper(Group, group_table,
extension=[vdm.sqlalchemy.Revisioner(group_revision_table),],
)
vdm.sqlalchemy.modify_base_object_mapper(Group, Revision, State)
GroupRevision = vdm.sqlalchemy.create_object_version(mapper, Group,
group_revision_table)
mapper(Member, member_table, properties={
'group': relation(Group,
backref=backref('member_all', cascade='all, delete-orphan')
),
},
extension=[vdm.sqlalchemy.Revisioner(member_revision_table),],
)
vdm.sqlalchemy.modify_base_object_mapper(Member, Revision, State)
MemberRevision = vdm.sqlalchemy.create_object_version(mapper, Member,
member_revision_table)
#TODO
MemberRevision.related_packages = lambda self: [self.continuity.package]
HIERARCHY_CTE = """
WITH RECURSIVE subtree(id) AS (
SELECT M.* FROM public.member AS M
WHERE M.table_name = 'group' AND M.state = 'active'
UNION
SELECT M.* FROM public.member M, subtree SG
WHERE M.table_id = SG.group_id AND M.table_name = 'group' AND M.state = 'active')
SELECT G.* FROM subtree AS ST
INNER JOIN public.group G ON G.id = ST.table_id
WHERE group_id = :id AND G.type = :type and table_name='group'
"""