# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""base application's entities class implementation: `AnyEntity`"""
__docformat__ = "restructuredtext en"
from logilab.common.decorators import classproperty
from cubicweb import Unauthorized
from cubicweb.entity import Entity
class AnyEntity(Entity):
"""an entity instance has e_schema automagically set on the class and
instances have access to their issuing cursor
"""
__regid__ = 'Any'
__implements__ = ()
@classmethod
def cw_create_url(cls, req, **kwargs):
""" return the url of the entity creation form for this entity type"""
return req.build_url('add/%s' % cls.__regid__, **kwargs)
@classmethod
def cw_fti_index_rql_queries(cls, req):
"""return the list of rql queries to fetch entities to FT-index
The default is to fetch all entities at once and to prefetch
indexable attributes but one could imagine iterating over
"smaller" resultsets if the table is very big or returning
a subset of entities that match some business-logic condition.
"""
restrictions = ['X is %s' % cls.__regid__]
selected = ['X']
for attrschema in cls.e_schema.indexable_attributes():
varname = attrschema.type.upper()
restrictions.append('X %s %s' % (attrschema, varname))
selected.append(varname)
return ['Any %s WHERE %s' % (', '.join(selected),
', '.join(restrictions))]
# meta data api ###########################################################
@classproperty
def cw_etype(self):
"""entity Etype as a string"""
return self.__regid__
def dc_title(self):
"""return a suitable *unicode* title for this entity"""
for rschema, attrschema in self.e_schema.attribute_definitions():
if rschema.meta:
continue
value = self.cw_attr_value(rschema.type)
if value:
# make the value printable (dates, floats, bytes, etc.)
return self.printable_value(rschema.type, value, attrschema.type,
format='text/plain')
return u'%s #%s' % (self.dc_type(), self.eid)
def dc_long_title(self):
"""return a more detailled title for this entity"""
return self.dc_title()
def dc_description(self, format='text/plain'):
"""return a suitable description for this entity"""
if 'description' in self.e_schema.subjrels:
return self.printable_value('description', format=format)
return u''
def dc_authors(self):
"""return a suitable description for the author(s) of the entity"""
try:
return ', '.join(u.name() for u in self.owned_by)
except Unauthorized:
return u''
def dc_creator(self):
"""return a suitable description for the creator of the entity"""
if self.creator:
return self.creator.name()
return u''
def dc_date(self, date_format=None):# XXX default to ISO 8601 ?
"""return latest modification date of this entity"""
return self._cw.format_date(self.modification_date, date_format=date_format)
def dc_type(self, form=''):
"""return the display name for the type of this entity (translated)"""
return self.e_schema.display_name(self._cw, form)
def dc_language(self):
"""return language used by this entity (translated)"""
# check if entities has internationalizable attributes
# XXX one is enough or check if all String attributes are internationalizable?
for rschema, attrschema in self.e_schema.attribute_definitions():
if rschema.rdef(self.e_schema, attrschema).internationalizable:
return self._cw._(self._cw.user.property_value('ui.language'))
return self._cw._(self._cw.vreg.property_value('ui.language'))
@property
def creator(self):
"""return the CWUser entity which has created this entity, or None if
unknown or if the curent user doesn't has access to this euser
"""
try:
return self.created_by[0]
except (Unauthorized, IndexError):
return None
# abstractions making the whole things (well, some at least) working ######
def sortvalue(self, rtype=None):
"""return a value which can be used to sort this entity or given
entity's attribute
"""
if rtype is None:
return self.dc_title().lower()
value = self.cw_attr_value(rtype)
# do not restrict to `unicode` because Bytes will return a `str` value
if isinstance(value, basestring):
return self.printable_value(rtype, format='text/plain').lower()
return value
def fetch_config(fetchattrs, mainattr=None, pclass=AnyEntity, order='ASC'):
"""function to ease basic configuration of an entity class ORM. Basic usage
is:
.. sourcecode:: python
class MyEntity(AnyEntity):
fetch_attrs, cw_fetch_order = fetch_config(['attr1', 'attr2'])
# uncomment line below if you want the same sorting for 'unrelated' entities
# cw_fetch_unrelated_order = cw_fetch_order
Using this, when using ORM methods retrieving this type of entity, 'attr1'
and 'attr2' will be automatically prefetched and results will be sorted on
'attr1' ascending (ie the first attribute in the list).
This function will automatically add to fetched attributes those defined in
parent class given using the `pclass` argument.
Also, You can use `mainattr` and `order` argument to have a different
sorting.
"""
if pclass is not None:
fetchattrs += pclass.fetch_attrs
if mainattr is None:
mainattr = fetchattrs[0]
@classmethod
def fetch_order(cls, select, attr, var):
if attr == mainattr:
select.add_sort_var(var, order=='ASC')
return fetchattrs, fetch_order