--- a/web/facet.py Fri Oct 01 16:07:03 2010 +0200
+++ b/web/facet.py Fri Oct 01 16:53:35 2010 +0200
@@ -55,7 +55,7 @@
from logilab.common.date import datetime2ticks
from logilab.common.compat import all
-from rql import parse, nodes
+from rql import parse, nodes, utils
from cubicweb import Unauthorized, typed_eid
from cubicweb.schema import display_name
@@ -165,18 +165,27 @@
return ovar
return None
+def _make_relation(rqlst, mainvar, rtype, role):
+ newvar = rqlst.make_variable()
+ if role == 'object':
+ rel = nodes.make_relation(newvar, rtype, (mainvar,), nodes.VariableRef)
+ else:
+ rel = nodes.make_relation(mainvar, rtype, (newvar,), nodes.VariableRef)
+ return newvar, rel
+
def _add_rtype_relation(rqlst, mainvar, rtype, role):
"""add a relation relying `mainvar` to entities linked by the `rtype`
relation (where `mainvar` has `role`)
return the inserted variable for linked entities.
"""
- newvar = rqlst.make_variable()
- if role == 'object':
- rqlst.add_relation(newvar, rtype, mainvar)
- else:
- rqlst.add_relation(mainvar, rtype, newvar)
- return newvar
+ newvar, newrel = _make_relation(rqlst, mainvar, rtype, role)
+ rqlst.add_restriction(newrel)
+ return newvar, newrel
+
+def _add_eid_restr(rel, restrvar, value):
+ rrel = nodes.make_constant_restriction(restrvar, 'eid', value, 'Int')
+ rel.parent.replace(rel, nodes.And(rel, rrel))
def _prepare_vocabulary_rqlst(rqlst, mainvar, rtype, role,
select_target_entity=True):
@@ -187,7 +196,7 @@
* add the new variable to GROUPBY clause if necessary
* add the new variable to the selection
"""
- newvar = _add_rtype_relation(rqlst, mainvar, rtype, role)
+ newvar = _add_rtype_relation(rqlst, mainvar, rtype, role)[0]
if select_target_entity:
if rqlst.groupby:
rqlst.add_group_var(newvar)
@@ -240,7 +249,6 @@
_cleanup_rqlst(rqlst, mainvar)
var = _prepare_vocabulary_rqlst(rqlst, mainvar, rtype, role,
select_target_entity)
- # not found, create one
attrvar = rqlst.make_variable()
rqlst.add_relation(var, attrname, attrvar)
# if query is grouped, we have to add the attribute variable
@@ -449,6 +457,10 @@
The relation is defined by the `rtype` and `role` attributes.
+ The `no_relation` boolean flag tells if a special 'no relation' value should be
+ added (allowing to filter on entities which *do not* have the relation set).
+ Default is computed according the relation's cardinality.
+
The values displayed for related entities will be:
* result of calling their `label_vid` view if specified
@@ -456,7 +468,8 @@
* else their eid (you usually want something nicer...)
When no `label_vid` is set, you will get translated value if `i18nable` is
- set.
+ set. By default, `i18nable` will be set according to the schema, but you can
+ force its value by setting it has a class attribute.
You can filter out target entity types by specifying `target_type`
@@ -506,8 +519,6 @@
role = 'subject'
target_attr = 'eid'
target_type = None
- # should value be internationalized (XXX could be guessed from the schema)
- i18nable = True
# set this to a stored procedure name if you want to sort on the result of
# this function's result instead of direct value
sortfunc = None
@@ -520,6 +531,23 @@
_select_target_entity = True
title = property(rtype_facet_title)
+ no_relation_label = '<no relation>'
+
+ @property
+ def i18nable(self):
+ """should label be internationalized"""
+ if self.target_type:
+ eschema = self._cw.vreg.schema.eschema(self.target_type)
+ elif self.role == 'subject':
+ eschema = self._cw.vreg.schema.rschema(self.rtype).objects()[0]
+ else:
+ eschema = self._cw.vreg.schema.rschema(self.rtype).subjects()[0]
+ return eschema.rdef(self.target_attr).internationalizable
+
+ @property
+ def no_relation(self):
+ return (not self._cw.vreg.schema.rschema(self.rtype).final
+ and self._search_card('?*'))
@property
def rql_sort(self):
@@ -529,6 +557,7 @@
"""
return self.sortfunc is not None or (self.label_vid is None
and not self.i18nable)
+
def vocabulary(self):
"""return vocabulary for this facet, eg a list of 2-uple (label, value)
"""
@@ -555,7 +584,10 @@
rqlst.recover()
# don't call rset_vocabulary on empty result set, it may be an empty
# *list* (see rqlexec implementation)
- return rset and self.rset_vocabulary(rset)
+ values = rset and self.rset_vocabulary(rset) or []
+ if self._include_no_relation():
+ values.insert(0, (self._cw._(self.no_relation_label), ''))
+ return values
def possible_values(self):
"""return a list of possible values (as string since it's used to
@@ -572,12 +604,14 @@
insert_attr_select_relation(
rqlst, self.filtered_variable, self.rtype, self.role, self.target_attr,
select_target_entity=False)
- return [str(x) for x, in self.rqlexec(rqlst.as_string())]
+ values = [str(x) for x, in self.rqlexec(rqlst.as_string())]
except:
- import traceback
- traceback.print_exc()
+ self.exception('while computing values for %s', self)
finally:
rqlst.recover()
+ if self._include_no_relation():
+ values.append('')
+ return values
def rset_vocabulary(self, rset):
if self.i18nable:
@@ -585,56 +619,103 @@
else:
_ = unicode
if self.rql_sort:
- return [(_(label), eid) for eid, label in rset]
- if self.label_vid is None:
- assert self.i18nable
values = [(_(label), eid) for eid, label in rset]
else:
- values = [(entity.view(self.label_vid), entity.eid)
- for entity in rset.entities()]
- values = sorted(values)
- if self.sortasc:
- return values
- return reversed(values)
+ if self.label_vid is None:
+ values = [(_(label), eid) for eid, label in rset]
+ else:
+ values = [(entity.view(self.label_vid), entity.eid)
+ for entity in rset.entities()]
+ values = sorted(values)
+ if not self.sortasc:
+ values = list(reversed(values))
+ return values
+
+ def support_and(self):
+ return self._search_card('+*')
+
+ def add_rql_restrictions(self):
+ """add restriction for this facet into the rql syntax tree"""
+ value = self._cw.form.get(self.__regid__)
+ if value is None:
+ return
+ mainvar = self.filtered_variable
+ restrvar, rel = _add_rtype_relation(self.rqlst, mainvar, self.rtype,
+ self.role)
+ if isinstance(value, basestring):
+ # only one value selected
+ if value:
+ self.rqlst.add_eid_restriction(restrvar, value)
+ else:
+ rel.parent.replace(rel, nodes.Not(rel))
+ elif self.operator == 'OR':
+ # set_distinct only if rtype cardinality is > 1
+ if self.support_and():
+ self.rqlst.set_distinct(True)
+ # multiple ORed values: using IN is fine
+ if '' in value:
+ value.remove('')
+ self._add_not_rel_restr(rel)
+ _add_eid_restr(rel, restrvar, value)
+ else:
+ # multiple values with AND operator
+ if '' in value:
+ value.remove('')
+ self._add_not_rel_restr(rel)
+ _add_eid_restr(rel, restrvar, value.pop())
+ while value:
+ restrvar, rtrel = _make_relation(self.rqlst, mainvar,
+ self.rtype, self.role)
+ _add_eid_restr(rel, restrvar, value.pop())
@cached
- def support_and(self):
+ def _search_card(self, cards):
+ for rdef in self._iter_rdefs():
+ if rdef.role_cardinality(self.role) in cards:
+ return True
+ return False
+
+ def _iter_rdefs(self):
rschema = self._cw.vreg.schema.rschema(self.rtype)
# XXX when called via ajax, no rset to compute possible types
possibletypes = self.cw_rset and self.cw_rset.column_types(0)
for rdef in rschema.rdefs.itervalues():
if possibletypes is not None:
if self.role == 'subject':
- if not rdef.subject in possibletypes:
+ if rdef.subject not in possibletypes:
continue
- elif not rdef.object in possibletypes:
+ elif rdef.object not in possibletypes:
continue
- if rdef.role_cardinality(self.role) in '+*':
- return True
- return False
+ if self.target_type is not None:
+ if self.role == 'subject':
+ if rdef.object != self.target_type:
+ continue
+ elif rdef.subject != self.target_type:
+ continue
+ yield rdef
- def add_rql_restrictions(self):
- """add restriction for this facet into the rql syntax tree"""
- value = self._cw.form.get(self.__regid__)
- if not value:
- return
- mainvar = self.filtered_variable
- restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype, self.role)
- if isinstance(value, basestring):
- # only one value selected
- self.rqlst.add_eid_restriction(restrvar, value)
- elif self.operator == 'OR':
- # set_distinct only if rtype cardinality is > 1
- if self.support_and():
- self.rqlst.set_distinct(True)
- # multiple ORed values: using IN is fine
- self.rqlst.add_eid_restriction(restrvar, value)
+ def _include_no_relation(self):
+ if not self.no_relation:
+ return False
+ if self._cw.vreg.schema.rschema(self.rtype).final:
+ return False
+ if self.role == 'object':
+ subj = utils.rqlvar_maker(defined=self.rqlst.defined_vars,
+ aliases=self.rqlst.aliases).next()
+ obj = self.filtered_variable.name
else:
- # multiple values with AND operator
- self.rqlst.add_eid_restriction(restrvar, value.pop())
- while value:
- restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype, self.role)
- self.rqlst.add_eid_restriction(restrvar, value.pop())
+ subj = self.filtered_variable.name
+ obj = utils.rqlvar_maker(defined=self.rqlst.defined_vars,
+ aliases=self.rqlst.aliases).next()
+ rql = 'Any %s LIMIT 1 WHERE NOT %s %s %s, %s' % (
+ self.filtered_variable.name, subj, self.rtype, obj,
+ self.rqlst.where.as_string())
+ return bool(self.rqlexec(rql, self.cw_rset and self.cw_rset.args))
+
+ def _add_not_rel_restr(self, rel):
+ nrrel = nodes.Not(_make_relation(self.rqlst, self.filtered_variable,
+ self.rtype, self.role)[1])
+ rel.parent.replace(rel, nodes.Or(nrrel, rel))
class RelationAttributeFacet(RelationFacet):
@@ -699,20 +780,25 @@
if not value:
return
mainvar = self.filtered_variable
- restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype, self.role)
+ restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype,
+ self.role)[0]
self.rqlst.set_distinct(True)
if isinstance(value, basestring) or self.operator == 'OR':
# only one value selected or multiple ORed values: using IN is fine
- self.rqlst.add_constant_restriction(restrvar, self.target_attr, value,
- self.attrtype, self.comparator)
+ self.rqlst.add_constant_restriction(
+ restrvar, self.target_attr, value,
+ self.attrtype, self.comparator)
else:
# multiple values with AND operator
- self.rqlst.add_constant_restriction(restrvar, self.target_attr, value.pop(),
- self.attrtype, self.comparator)
+ self.rqlst.add_constant_restriction(
+ restrvar, self.target_attr, value.pop(),
+ self.attrtype, self.comparator)
while value:
- restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype, self.role)
- self.rqlst.add_constant_restriction(restrvar, self.target_attr, value.pop(),
- self.attrtype, self.comparator)
+ restrvar = _add_rtype_relation(self.rqlst, mainvar, self.rtype,
+ self.role)[0]
+ self.rqlst.add_constant_restriction(
+ restrvar, self.target_attr, value.pop(),
+ self.attrtype, self.comparator)
class AttributeFacet(RelationAttributeFacet):
@@ -749,6 +835,16 @@
_select_target_entity = True
+ @property
+ def i18nable(self):
+ """should label be internationalized"""
+ for rdef in self._iter_rdefs():
+ # no 'internationalizable' property for rdef whose object is not a
+ # String
+ if not getattr(rdef, 'internationalizable', False):
+ return False
+ return True
+
def vocabulary(self):
"""return vocabulary for this facet, eg a list of 2-uple (label, value)
"""