web/views/facets.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Tue, 02 Mar 2010 15:37:45 +0100
branchstable
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"""the facets box and some basic facets
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:organization: Logilab
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:copyright: 2008-2010 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 simplejson import dumps
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from logilab.mtconverter import xml_escape
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from cubicweb.appobject import objectify_selector
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from cubicweb.selectors import (non_final_entity, multi_lines_rset,
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                                match_context_prop, yes, relation_possible)
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from cubicweb.web.box import BoxTemplate
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from cubicweb.web.facet import (AbstractFacet, FacetStringWidget, RelationFacet,
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                                prepare_facets_rqlst, filter_hiddens, _cleanup_rqlst,
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                                _prepare_vocabulary_rqlst)
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@objectify_selector
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def contextview_selector(cls, req, rset=None, row=None, col=None, view=None,
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                         **kwargs):
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    if view and getattr(view, 'filter_box_context_info', lambda: None)():
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        return 1
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    return 0
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class FilterBox(BoxTemplate):
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    """filter results of a query"""
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    __regid__ = 'filter_box'
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    __select__ = (((non_final_entity() & multi_lines_rset())
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                   | contextview_selector()
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                   ) & match_context_prop())
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    context = 'left'
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    title = _('boxes_filter_box')
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    visible = True # functionality provided by the search box by default
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    order = 1
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    roundcorners = True
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    needs_css = 'cubicweb.facets.css'
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    needs_js = ('cubicweb.ajax.js', 'cubicweb.facets.js')
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    bk_linkbox_template = u'<div class="facetTitle">%s</div>'
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    def facetargs(self):
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        """this method returns the list of extra arguments that should
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        be used by the facet
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        """
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        return {}
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    def _get_context(self, view):
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        context = getattr(view, 'filter_box_context_info', lambda: None)()
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        if context:
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            rset, vid, divid, paginate = context
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        else:
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            rset = self.cw_rset
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            vid, divid = None, 'pageContent'
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            paginate = view and view.paginable
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        return rset, vid, divid, paginate
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    def call(self, view=None):
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        req = self._cw
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        req.add_js( self.needs_js )
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        req.add_css( self.needs_css)
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        if self.roundcorners:
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            req.html_headers.add_onload('jQuery(".facet").corner("tl br 10px");')
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        rset, vid, divid, paginate = self._get_context(view)
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        if rset.rowcount < 2: # XXX done by selectors, though maybe necessary when rset has been hijacked
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            return
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        rqlst = self.cw_rset.syntax_tree()
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        # union not yet supported
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        if len(rqlst.children) != 1:
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            return ()
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        rqlst = rqlst.copy()
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        req.vreg.rqlhelper.annotate(rqlst)
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        mainvar, baserql = prepare_facets_rqlst(rqlst, rset.args)
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        widgets = []
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        for facet in self.get_facets(rset, rqlst.children[0], mainvar):
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            if facet.cw_propval('visible'):
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                wdg = facet.get_widget()
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                if wdg is not None:
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                    widgets.append(wdg)
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        if not widgets:
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            return
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        if vid is None:
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            vid = req.form.get('vid')
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        if self.bk_linkbox_template:
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            self.display_bookmark_link(rset)
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        w = self.w
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        w(u'<form method="post" id="%sForm" cubicweb:facetargs="%s" action="">'  % (
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            divid, xml_escape(dumps([divid, vid, paginate, self.facetargs()]))))
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        w(u'<fieldset>')
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        hiddens = {'facets': ','.join(wdg.facet.__regid__ for wdg in widgets),
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                   'baserql': baserql}
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        for param in ('subvid', 'vtitle'):
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            if param in req.form:
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                hiddens[param] = req.form[param]
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        filter_hiddens(w, **hiddens)
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        for wdg in widgets:
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            wdg.render(w=self.w)
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        w(u'</fieldset>\n</form>\n')
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    def display_bookmark_link(self, rset):
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        eschema = self._cw.vreg.schema.eschema('Bookmark')
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        if eschema.has_perm(self._cw, 'add'):
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            bk_path = 'view?rql=%s' % rset.printable_rql()
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            bk_title = self._cw._('my custom search')
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            linkto = 'bookmarked_by:%s:subject' % self._cw.user.eid
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            bk_add_url = self._cw.build_url('add/Bookmark', path=bk_path, title=bk_title, __linkto=linkto)
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            bk_base_url = self._cw.build_url('add/Bookmark', title=bk_title, __linkto=linkto)
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            bk_link = u'<a cubicweb:target="%s" id="facetBkLink" href="%s">%s</a>' % (
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                    xml_escape(bk_base_url),
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                    xml_escape(bk_add_url),
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                    self._cw._('bookmark this search'))
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            self.w(self.bk_linkbox_template % bk_link)
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    def get_facets(self, rset, rqlst, mainvar):
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        return self._cw.vreg['facets'].poss_visible_objects(
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            self._cw, rset=rset, rqlst=rqlst,
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            context='facetbox', filtered_variable=mainvar)
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0
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# facets ######################################################################
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class CreatedByFacet(RelationFacet):
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    __regid__ = 'created_by-facet'
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    rtype = 'created_by'
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    target_attr = 'login'
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class InGroupFacet(RelationFacet):
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    __regid__ = 'in_group-facet'
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    rtype = 'in_group'
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    target_attr = 'name'
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class InStateFacet(RelationFacet):
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    __regid__ = 'in_state-facet'
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    rtype = 'in_state'
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    target_attr = 'name'
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# inherit from RelationFacet to benefit from its possible_values implementation
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class ETypeFacet(RelationFacet):
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    __regid__ = 'etype-facet'
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    __select__ = yes()
0
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    order = 1
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    rtype = 'is'
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    target_attr = 'name'
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    @property
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    def title(self):
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        return self._cw._('entity type')
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    def vocabulary(self):
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        """return vocabulary for this facet, eg a list of 2-uple (label, value)
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        """
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        etypes = self.cw_rset.column_types(0)
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        return sorted((self._cw._(etype), etype) for etype in etypes)
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0
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    def add_rql_restrictions(self):
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        """add restriction for this facet into the rql syntax tree"""
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        value = self._cw.form.get(self.__regid__)
0
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        if not value:
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            return
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        self.rqlst.add_type_restriction(self.filtered_variable, value)
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    def possible_values(self):
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        """return a list of possible values (as string since it's used to
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        compare to a form value in javascript) for this facet
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        """
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        rqlst = self.rqlst
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        rqlst.save_state()
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        try:
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            _cleanup_rqlst(rqlst, self.filtered_variable)
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            etype_var = _prepare_vocabulary_rqlst(rqlst, self.filtered_variable, self.rtype, self.role)
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            attrvar = rqlst.make_variable()
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            rqlst.add_selected(attrvar)
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            rqlst.add_relation(etype_var, 'name', attrvar)
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            return [etype for _, etype in self.rqlexec(rqlst.as_string())]
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        finally:
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            rqlst.recover()
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class HasTextFacet(AbstractFacet):
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    __select__ = relation_possible('has_text', 'subject') & match_context_prop()
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    __regid__ = 'has_text-facet'
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    rtype = 'has_text'
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    role = 'subject'
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    order = 0
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    @property
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    def title(self):
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        return self._cw._('has_text')
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0
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    def get_widget(self):
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        """return the widget instance to use to display this facet
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        default implentation expects a .vocabulary method on the facet and
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        return a combobox displaying this vocabulary
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        """
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        return FacetStringWidget(self)
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    def add_rql_restrictions(self):
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        """add restriction for this facet into the rql syntax tree"""
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        value = self._cw.form.get(self.__regid__)
0
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        if not value:
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            return
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        self.rqlst.add_constant_restriction(self.filtered_variable, 'has_text', value, 'String')