entities/__init__.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 16 Feb 2010 09:25:18 +0100
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"""base application's entities class implementation: `AnyEntity`
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from warnings import warn
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from logilab.common.deprecation import deprecated
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from logilab.common.decorators import cached
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from cubicweb import Unauthorized, typed_eid
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from cubicweb.entity import Entity
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from cubicweb.interfaces import IBreadCrumbs, IFeed
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class AnyEntity(Entity):
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    """an entity instance has e_schema automagically set on the class and
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    instances have access to their issuing cursor
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    """
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    __regid__ = 'Any'
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    __implements__ = (IBreadCrumbs, IFeed)
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    fetch_attrs = ('modification_date',)
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    @classmethod
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    def fetch_order(cls, attr, var):
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        """class method used to control sort order when multiple entities of
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        this type are fetched
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        """
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        return cls.fetch_unrelated_order(attr, var)
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    @classmethod
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    def fetch_unrelated_order(cls, attr, var):
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        """class method used to control sort order when multiple entities of
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        this type are fetched to use in edition (eg propose them to create a
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        new relation on an edited entity).
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        """
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        if attr == 'modification_date':
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            return '%s DESC' % var
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        return None
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    # meta data api ###########################################################
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    def dc_title(self):
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        """return a suitable *unicode* title for this entity"""
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        for rschema, attrschema in self.e_schema.attribute_definitions():
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            if rschema.meta:
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                continue
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            value = self.get_value(rschema.type)
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            if value:
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                # make the value printable (dates, floats, bytes, etc.)
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                return self.printable_value(rschema.type, value, attrschema.type,
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                                            format='text/plain')
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        return u'%s #%s' % (self.dc_type(), self.eid)
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    def dc_long_title(self):
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        """return a more detailled title for this entity"""
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        return self.dc_title()
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    def dc_description(self, format='text/plain'):
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        """return a suitable description for this entity"""
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        if 'description' in self.e_schema.subjrels:
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            return self.printable_value('description', format=format)
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        return u''
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    def dc_authors(self):
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        """return a suitable description for the author(s) of the entity"""
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        try:
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            return ', '.join(u.name() for u in self.owned_by)
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        except Unauthorized:
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            return u''
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    def dc_creator(self):
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        """return a suitable description for the creator of the entity"""
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        if self.creator:
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            return self.creator.name()
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        return u''
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    def dc_date(self, date_format=None):# XXX default to ISO 8601 ?
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        """return latest modification date of this entity"""
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        return self._cw.format_date(self.modification_date, date_format=date_format)
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    def dc_type(self, form=''):
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        """return the display name for the type of this entity (translated)"""
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        return self.e_schema.display_name(self._cw, form)
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    def dc_language(self):
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        """return language used by this entity (translated)"""
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        # check if entities has internationalizable attributes
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        # XXX one is enough or check if all String attributes are internationalizable?
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        for rschema, attrschema in self.e_schema.attribute_definitions():
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            if rschema.rdef(self.e_schema, attrschema).internationalizable:
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                return self._cw._(self._cw.user.property_value('ui.language'))
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        return self._cw._(self._cw.vreg.property_value('ui.language'))
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0
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    @property
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    def creator(self):
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        """return the CWUser entity which has created this entity, or None if
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        unknown or if the curent user doesn't has access to this euser
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        """
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        try:
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            return self.created_by[0]
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        except (Unauthorized, IndexError):
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            return None
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    def breadcrumbs(self, view=None, recurs=False):
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        path = [self]
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        if hasattr(self, 'parent'):
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            parent = self.parent()
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            if parent is not None:
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                try:
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                    path = parent.breadcrumbs(view, True) + [self]
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                except TypeError:
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                    warn("breadcrumbs method's now takes two arguments "
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                         "(view=None, recurs=False), please update",
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                         DeprecationWarning)
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                    path = parent.breadcrumbs(view) + [self]
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        if not recurs:
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            if view is None:
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                if 'vtitle' in self._cw.form:
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                    # embeding for instance
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                    path.append( self._cw.form['vtitle'] )
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            elif view.__regid__ != 'primary' and hasattr(view, 'title'):
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                path.append( self._cw._(view.title) )
0
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        return path
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    ## IFeed interface ########################################################
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    def rss_feed_url(self):
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        return self.absolute_url(vid='rss')
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    # abstractions making the whole things (well, some at least) working ######
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0
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    def sortvalue(self, rtype=None):
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        """return a value which can be used to sort this entity or given
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        entity's attribute
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        """
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        if rtype is None:
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            return self.dc_title().lower()
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        value = self.get_value(rtype)
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        # do not restrict to `unicode` because Bytes will return a `str` value
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        if isinstance(value, basestring):
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            return self.printable_value(rtype, format='text/plain').lower()
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        return value
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    # edition helper functions ################################################
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    def linked_to(self, rtype, role, remove=True):
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        """if entity should be linked to another using __linkto form param for
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        the given relation/role, return eids of related entities
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        This method is consuming matching link-to information from form params
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        if `remove` is True (by default).
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        """
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        try:
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            return self.__linkto[(rtype, role)]
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        except AttributeError:
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            self.__linkto = {}
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        except KeyError:
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            pass
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        linktos = list(self._cw.list_form_param('__linkto'))
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        linkedto = []
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        for linkto in linktos[:]:
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            ltrtype, eid, ltrole = linkto.split(':')
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            if rtype == ltrtype and role == ltrole:
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                # delete __linkto from form param to avoid it being added as
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                # hidden input
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                if remove:
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                    linktos.remove(linkto)
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                    self._cw.form['__linkto'] = linktos
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                linkedto.append(typed_eid(eid))
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        self.__linkto[(rtype, role)] = linkedto
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        return linkedto
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    # edit controller callbacks ###############################################
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    def after_deletion_path(self):
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        """return (path, parameters) which should be used as redirect
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        information when this entity is being deleted
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        """
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        if hasattr(self, 'parent') and self.parent():
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            return self.parent().rest_path(), {}
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        return str(self.e_schema).lower(), {}
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    def pre_web_edit(self):
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        """callback called by the web editcontroller when an entity will be
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        created/modified, to let a chance to do some entity specific stuff.
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        Do nothing by default.
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        """
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        pass
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    # server side helpers #####################################################
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    def notification_references(self, view):
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        """used to control References field of email send on notification
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        for this entity. `view` is the notification view.
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        Should return a list of eids which can be used to generate message ids
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        of previously sent email
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        """
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        return ()
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0
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# XXX:  store a reference to the AnyEntity class since it is hijacked in goa
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#       configuration and we need the actual reference to avoid infinite loops
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#       in mro
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ANYENTITY = AnyEntity
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def fetch_config(fetchattrs, mainattr=None, pclass=AnyEntity, order='ASC'):
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    if pclass is ANYENTITY:
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        pclass = AnyEntity # AnyEntity and ANYENTITY may be different classes
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    if pclass is not None:
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        fetchattrs += pclass.fetch_attrs
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    if mainattr is None:
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        mainattr = fetchattrs[0]
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    @classmethod
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    def fetch_order(cls, attr, var):
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        if attr == mainattr:
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            return '%s %s' % (var, order)
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        return None
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    return fetchattrs, fetch_order