web/views/facets.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 05 Jun 2009 16:41:09 +0200
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"""the facets box and some basic facets
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:organization: Logilab
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:copyright: 2008-2009 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 html_escape
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from cubicweb.vregistry import objectify_selector
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from cubicweb.selectors import (non_final_entity, two_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)
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@objectify_selector
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def contextview_selector(cls, req, rset, 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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    id = 'filter_box'
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    __select__ = (((non_final_entity() & two_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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    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.rset
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            vid, divid = None, 'pageContent'
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            paginate = view and view.need_navigation
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        return rset, vid, divid, paginate
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    def call(self, view=None):
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        req = self.req
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        req.add_js( ('cubicweb.ajax.js', 'cubicweb.formfilter.js') )
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        req.add_css('cubicweb.facets.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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        if vid is None:
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            vid = req.form.get('vid')
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        rqlst = rset.syntax_tree()
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        rqlst.save_state()
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        try:
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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, mainvar):
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                if facet.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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            w = self.w
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            eschema = self.schema.eschema('Bookmark')
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            if eschema.has_perm(req, 'add'):
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                bk_path = 'view?rql=%s' % rset.printable_rql()
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                bk_title = req._('my custom search')
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                linkto = 'bookmarked_by:%s:subject' % self.req.user.eid
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                bk_add_url = self.build_url('add/Bookmark', path=bk_path, title=bk_title, __linkto=linkto)
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                bk_base_url = self.build_url('add/Bookmark', title=bk_title, __linkto=linkto)
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                w(u'<div class="facetTitle"><a cubicweb:target="%s" id="facetBkLink" href="%s">%s</a></div>' % (
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                    html_escape(bk_base_url),
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                    html_escape(bk_add_url),
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                    req._('bookmark this search')))
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            w(u'<form method="post" id="%sForm" cubicweb:facetargs="%s" action="">'  % (
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                divid, html_escape(dumps([divid, vid, paginate, self.facetargs()]))))
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            w(u'<fieldset>')
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            hiddens = {'facets': ','.join(wdg.facet.id 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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        finally:
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            rqlst.recover()
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            import cubicweb
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            cubicweb.info('after facets with rql: %s' % repr(rqlst))
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    def get_facets(self, rset, mainvar):
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        return self.vreg.possible_vobjects('facets', self.req, rset,
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                                           context='facetbox',
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                                           filtered_variable=mainvar)
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# facets ######################################################################
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class CreatedByFacet(RelationFacet):
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    id = '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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    id = '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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    id = '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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    id = '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.req._('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.rset.column_types(0)
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        return sorted((self.req._(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.req.form.get(self.id)
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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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class HasTextFacet(AbstractFacet):
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    __select__ = relation_possible('has_text', 'subject') & match_context_prop()
0
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    id = '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.req._('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.req.form.get(self.id)
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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')