web/action.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Mon, 25 Mar 2013 15:28:18 +0100
changeset 8787 1b3b7284377f
parent 8190 2a3c1b787688
child 9567 b87c09f853d3
permissions -rw-r--r--
[session] allow writable tx_attr and use it for commit_state This keep clarifying the code.
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""abstract action classes for CubicWeb web client
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Actions are typically displayed in an action box, but can also be used
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in other parts of the interface (the user menu, the footer, etc.). The
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'order', 'category' and 'title' class attributes control how the action will
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be displayed. The 'submenu' attribute is only used for actions in the
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action box.
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The most important method from a developper point of view in the
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:meth:'Action.url' method, which returns a URL on which the navigation
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should directed to perform the action.  There are two common ways of
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writing that method:
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* do nothing special and simply return a URL to the current rset with
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  a special view (with `self._cw.build_url(...)` for instance)
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* define an inner function `callback_func(req, *args)` which will do
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  the work and call it through `self._cw.user_callback(callback_func,
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  args, msg)`: this method will return a URL which calls the inner
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  function, and displays the message in the web interface when the
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  callback has completed (and report any exception occuring in the
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  callback too)
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Many examples of the first approach are available in :mod:`cubicweb.web.views.actions`.
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Here is an example of the second approach:
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.. sourcecode:: python
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 from cubicweb.web import action
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 class SomeAction(action.Action):
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     __regid__ = 'mycube_some_action'
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     title = _(some action)
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     __select__ = action.Action.__select__ & is_instance('TargetEntity')
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     def url(self):
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         if self.cw_row is None:
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             eids = [row[0] for row in self.cw_rset]
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         else:
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             eids = (self.cw_rset[self.cw_row][self.cw_col or 0],)
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         def do_action(req, eids):
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             for eid in eids:
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                 entity = req.entity_from_eid(eid, 'TargetEntity')
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                 entity.perform_action()
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         msg = self._cw._('some_action performed')
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         return self._cw.user_callback(do_action, (eids,), msg)
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cubicweb import target
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from cubicweb.predicates import (partial_relation_possible, match_search_state,
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                                 one_line_rset)
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from cubicweb.appobject import AppObject
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class Action(AppObject):
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    """abstract action. Handle the .search_states attribute to match
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    request search state.
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    """
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    __registry__ = 'actions'
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    __select__ = match_search_state('normal')
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    order = 99
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    category = 'moreactions'
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    # actions in category 'moreactions' can specify a sub-menu in which they should be filed
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    submenu = None
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    def actual_actions(self):
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        yield self
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    def fill_menu(self, box, menu):
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        """add action(s) to the given submenu of the given box"""
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        for action in self.actual_actions():
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            menu.append(box.action_link(action))
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    def html_class(self):
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        if self._cw.selected(self.url()):
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            return 'selected'
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    def build_action(self, title, url, **kwargs):
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        return UnregisteredAction(self._cw, title, url, **kwargs)
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    def url(self):
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        """return the url associated with this action"""
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        raise NotImplementedError
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class UnregisteredAction(Action):
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    """non registered action, used to build boxes"""
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    category = None
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    id = None
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    def __init__(self, req, title, url, **kwargs):
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        Action.__init__(self, req)
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        self.title = req._(title)
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        self._url = url
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        self.__dict__.update(kwargs)
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    def url(self):
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        return self._url
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class LinkToEntityAction(Action):
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    """base class for actions consisting to create a new object with an initial
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    relation set to an entity.
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    Additionaly to EntityAction behaviour, this class is parametrized using
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    .rtype, .role and .target_etype attributes to check if the action apply and
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    if the logged user has access to it (see
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    :class:`~cubicweb.selectors.partial_relation_possible` selector
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    documentation for more information).
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    """
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    __select__ = (match_search_state('normal') & one_line_rset()
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                  & partial_relation_possible(action='add', strict=True))
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    submenu = 'addrelated'
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    # to be defined in concrete classes
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    target_etype = rtype = None
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    def url(self):
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        ttype = self.target_etype
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        linkto = '%s:%s:%s' % (self.rtype, entity.eid, target(self))
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        return self._cw.vreg["etypes"].etype_class(ttype).cw_create_url(self._cw,
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                                  __redirectpath=entity.rest_path(), __linkto=linkto,
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                                  __redirectvid=self._cw.form.get('__redirectvid', ''))
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