web/views/autoform.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 26 Jan 2010 10:35:23 +0100
changeset 4360 5fdb9da1fab0
parent 4306 01e5efc0d823
child 4378 785c56bdacc6
permissions -rw-r--r--
move CWProperty rtags from autoform to cwproperties module.
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"""The automatic entity form.
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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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_ = unicode
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from logilab.common.decorators import cached, iclassmethod
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from cubicweb import typed_eid
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from cubicweb.web import stdmsgs, uicfg
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from cubicweb.web import form, formwidgets as fwdgs
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from cubicweb.web.views import forms, editforms, editviews
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_afs = uicfg.autoform_section
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class AutomaticEntityForm(forms.EntityFieldsForm):
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    """base automatic form to edit any entity.
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    Designed to be fully generated from schema but highly configurable through:
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    * uicfg (autoform_* relation tags)
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    * various standard form parameters
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    * overriding
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    You can also easily customise it by adding/removing fields in
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    AutomaticEntityForm instances or by inheriting from it.
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    """
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    __regid__ = 'edition'
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    cwtarget = 'eformframe'
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    cssclass = 'entityForm'
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    copy_nav_params = True
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    form_buttons = [fwdgs.SubmitButton(),
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                    fwdgs.Button(stdmsgs.BUTTON_APPLY, cwaction='apply'),
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                    fwdgs.Button(stdmsgs.BUTTON_CANCEL, cwaction='cancel')]
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    # for attributes selection when searching in uicfg.autoform_section
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    formtype = 'main'
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    # set this to a list of [(relation, role)] if you want to explictily tell
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    # which relations should be edited
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    display_fields = None
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    def _generic_relations_field(self):
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        try:
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            srels_by_cat = self.srelations_by_category('generic', 'add', strict=True)
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            warn('[3.6] %s: srelations_by_category is deprecated, use uicfg or '
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                 'override editable_relations instead' % classid(form),
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                 DeprecationWarning)
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        except AttributeError:
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            srels_by_cat = self.editable_relations()
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        if not srels_by_cat:
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            raise form.FieldNotFound('_cw_generic_field')
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        return editviews.GenericRelationsField(self.editable_relations())
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    @iclassmethod
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    def field_by_name(cls_or_self, name, role=None, eschema=None):
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        """return field with the given name and role. If field is not explicitly
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        defined for the form but `eclass` is specified, guess_field will be
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        called.
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        """
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        try:
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            return super(AutomaticEntityForm, cls_or_self).field_by_name(name, role, eschema)
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        except form.FieldNotFound:
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            if name == '_cw_generic_field' and not isinstance(cls_or_self, type):
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                return cls_or_self._generic_relations_field()
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            raise
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    # base automatic entity form methods #######################################
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    def __init__(self, *args, **kwargs):
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        super(AutomaticEntityForm, self).__init__(*args, **kwargs)
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        entity = self.edited_entity
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        if entity.has_eid():
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            entity.complete()
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        for rtype, role in self.editable_attributes():
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            try:
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                self.field_by_name(str(rtype), role)
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                continue # explicitly specified
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            except form.FieldNotFound:
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                # has to be guessed
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                try:
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                    field = self.field_by_name(str(rtype), role,
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                                               eschema=entity.e_schema)
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                    self.fields.append(field)
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                except form.FieldNotFound:
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                    # meta attribute such as <attr>_format
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                    continue
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        if self.formtype == 'main' and entity.has_eid() and (
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            self.display_fields is None or
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            '_cw_generic_field' in self.display_fields):
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            try:
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                self.fields.append(self.field_by_name('_cw_generic_field'))
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            except form.FieldNotFound:
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                # no editable relation
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                pass
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        self.maxrelitems = self._cw.property_value('navigation.related-limit')
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        self.force_display = bool(self._cw.form.get('__force_display'))
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        fnum = len(self.fields)
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        self.fields.sort(key=lambda f: f.order is None and fnum or f.order)
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    @property
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    def related_limit(self):
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        if self.force_display:
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            return None
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        return self.maxrelitems + 1
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    @property
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   112
    def needs_multipart(self):
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        """true if the form needs enctype=multipart/form-data"""
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        return self._subform_needs_multipart()
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   115
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    def build_context(self, rendervalues=None):
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        super(AutomaticEntityForm, self).build_context(rendervalues)
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        for form in self.inlined_forms():
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            form.build_context(rendervalues)
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   120
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    def _subform_needs_multipart(self, _tested=None):
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        if _tested is None:
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            _tested = set()
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        if super(AutomaticEntityForm, self).needs_multipart:
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   125
            return True
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        # take a look at inlined forms to check (recursively) if they
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   127
        # need multipart handling.
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   128
        # XXX: this is very suboptimal because inlined forms will be
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   129
        #      selected / instantiated twice : here and during form rendering.
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   130
        #      Potential solutions:
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   131
        #       -> use subforms for inlined forms to get easiser access
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        #       -> use a simple onload js function to check if there is
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        #          a input type=file in the form
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   134
        #       -> generate the <form> node when the content is rendered
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   135
        #          and we know the correct enctype (formrenderer's w attribute
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   136
        #          is not a StringIO)
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   137
        for formview in self.inlined_form_views():
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   138
            if formview.form:
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   139
                if hasattr(formview.form, '_subform_needs_multipart'):
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   140
                    needs_multipart = formview.form._subform_needs_multipart(_tested)
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   141
                else:
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                    needs_multipart = formview.form.needs_multipart
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   143
                if needs_multipart:
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   144
                    return True
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        return False
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   146
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   147
    def action(self):
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        """return the form's action attribute. Default to validateform if not
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   149
        explicitly overriden.
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   150
        """
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   151
        try:
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            return self._action
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   153
        except AttributeError:
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            return self._cw.build_url('validateform')
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   155
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    def set_action(self, value):
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   157
        """override default action"""
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   158
        self._action = value
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   159
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   160
    action = property(action, set_action)
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   161
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    # methods mapping edited entity relations to fields in the form ############
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   163
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   164
    def _relations_by_section(self, section, permission='add', strict=False):
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        """return a list of (relation schema, target schemas, role) matching
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   166
        given category(ies) and permission
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        """
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   168
        return _afs.relations_by_section(
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            self.edited_entity, self.formtype, section, permission, strict)
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   170
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   171
    def editable_attributes(self, strict=False):
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        """return a list of (relation schema, role) to edit for the entity"""
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   173
        if self.display_fields is not None:
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            return self.display_fields
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   175
        # XXX we should simply put eid in the generated section, no?
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   176
        return [(rtype, role) for rtype, _, role in self._relations_by_section(
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   177
            'attributes', strict=strict) if rtype != 'eid']
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   178
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   179
    def editable_relations(self):
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        """return a sorted list of (relation's label, relation'schema, role) for
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   181
        relations in the 'relations' section
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   182
        """
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   183
        result = []
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   184
        for rschema, _, role in self._relations_by_section('relations',
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   185
                                                           strict=True):
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   186
            result.append( (rschema.display_name(self.edited_entity._cw, role,
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   187
                                                 self.edited_entity.__regid__),
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   188
                            rschema, role) )
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   189
        return sorted(result)
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   190
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   191
    def inlined_relations(self):
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   192
        """return a list of (relation schema, target schemas, role) matching
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   193
        given category(ies) and permission
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   194
        """
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   195
        return self._relations_by_section('inlined')
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   196
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   197
    # generic relations modifier ###############################################
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   198
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   199
    # inlined forms support ####################################################
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   200
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   201
    @cached
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   202
    def inlined_form_views(self):
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        """compute and return list of inlined form views (hosting the inlined form object)
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   204
        """
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   205
        allformviews = []
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   206
        entity = self.edited_entity
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   207
        for rschema, ttypes, role in self.inlined_relations():
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   208
            # show inline forms only if there's one possible target type
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   209
            # for rschema
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   210
            if len(ttypes) != 1:
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   211
                self.warning('entity related by the %s relation should have '
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   212
                             'inlined form but there is multiple target types, '
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   213
                             'dunno what to do', rschema)
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   214
                continue
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            ttype = ttypes[0].type
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            if self.should_inline_relation_form(rschema, ttype, role):
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                formviews = list(self.inline_edition_form_view(rschema, ttype, role))
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                card = rschema.rdef(entity.e_schema, ttype).role_cardinality(role)
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                # there is no related entity and we need at least one: we need to
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                # display one explicit inline-creation view
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                if self.should_display_inline_creation_form(rschema, formviews, card):
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                    formviews += self.inline_creation_form_view(rschema, ttype, role)
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                # we can create more than one related entity, we thus display a link
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                # to add new related entities
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                if self.should_display_add_new_relation_link(rschema, formviews, card):
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                    addnewlink = self._cw.vreg['views'].select(
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                        'inline-addnew-link', self._cw,
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                        etype=ttype, rtype=rschema, role=role,
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                        peid=self.edited_entity.eid, pform=self, card=card)
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                    formviews.append(addnewlink)
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                allformviews += formviews
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        return allformviews
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    def inlined_forms(self):
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        for formview in self.inlined_form_views():
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            if formview.form: # may be None for the addnew_link artefact form
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                yield formview.form
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    def should_inline_relation_form(self, rschema, targettype, role):
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        """return true if the given relation with entity has role and a
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        targettype target should be inlined
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        At this point we now relation has inlined_attributes tag (eg is returned
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        by `inlined_relations()`. Overrides this for more finer control.
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        """
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        return True
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    def should_display_inline_creation_form(self, rschema, existant, card):
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        """return true if a creation form should be inlined
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        by default true if there is no related entity and we need at least one
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        """
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        return not existant and card in '1+' or self._cw.form.has_key('force_%s_display' % rschema)
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    def should_display_add_new_relation_link(self, rschema, existant, card):
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        """return true if we should add a link to add a new creation form
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        (through ajax call)
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        by default true if there is no related entity or if the relation has
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        multiple cardinality
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        """
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        return not existant or card in '+*' # XXX add target type permisssions
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    def should_hide_add_new_relation_link(self, rschema, card):
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        """return true if once an inlined creation form is added, the 'add new'
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   266
        link should be hidden
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   267
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   268
        by default true if the relation has single cardinality
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        """
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        return card in '1?'
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   271
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   272
    def inline_edition_form_view(self, rschema, ttype, role):
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        """yield inline form views for already related entities through the
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        given relation
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        """
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   276
        entity = self.edited_entity
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        related = entity.has_eid() and entity.related(rschema, role)
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        if related:
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   279
            vvreg = self._cw.vreg['views']
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   280
            # display inline-edition view for all existing related entities
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   281
            for i, relentity in enumerate(related.entities()):
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   282
                if relentity.has_perm('update'):
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   283
                    yield vvreg.select('inline-edition', self._cw, rset=related,
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                                       row=i, col=0, rtype=rschema, role=role,
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   285
                                       peid=entity.eid, pform=self)
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   286
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   287
    def inline_creation_form_view(self, rschema, ttype, role):
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   288
        """yield inline form views to a newly related (hence created) entity
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   289
        through the given relation
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   290
        """
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   291
        yield self._cw.vreg['views'].select('inline-creation', self._cw,
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   292
                                            etype=ttype, rtype=rschema, role=role,
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   293
                                            peid=self.edited_entity.eid, pform=self)
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diff changeset
   294
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   295
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   296
## default form ui configuration ##############################################
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   297
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   298
_afs = uicfg.autoform_section
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   299
# use primary and not generated for eid since it has to be an hidden
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   300
_afs.tag_attribute(('*', 'eid'), 'main', 'attributes')
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   301
_afs.tag_attribute(('*', 'eid'), 'muledit', 'attributes')
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   302
_afs.tag_attribute(('*', 'description'), 'main', 'attributes')
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   303
_afs.tag_attribute(('*', 'creation_date'), 'main', 'metadata')
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diff changeset
   304
_afs.tag_attribute(('*', 'modification_date'), 'main', 'metadata')
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diff changeset
   305
_afs.tag_attribute(('*', 'cwuri'), 'main', 'metadata')
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diff changeset
   306
_afs.tag_attribute(('*', 'has_text'), 'main', 'hidden')
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diff changeset
   307
_afs.tag_subject_of(('*', 'in_state', '*'), 'main', 'hidden')
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diff changeset
   308
_afs.tag_subject_of(('*', 'owned_by', '*'), 'main', 'metadata')
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diff changeset
   309
_afs.tag_subject_of(('*', 'created_by', '*'), 'main', 'metadata')
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diff changeset
   310
_afs.tag_subject_of(('*', 'require_permission', '*'), 'main', 'hidden')
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diff changeset
   311
_afs.tag_subject_of(('*', 'by_transition', '*'), 'main', 'attributes')
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diff changeset
   312
_afs.tag_subject_of(('*', 'by_transition', '*'), 'muledit', 'attributes')
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diff changeset
   313
_afs.tag_object_of(('*', 'by_transition', '*'), 'main', 'hidden')
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diff changeset
   314
_afs.tag_object_of(('*', 'from_state', '*'), 'main', 'hidden')
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diff changeset
   315
_afs.tag_object_of(('*', 'to_state', '*'), 'main', 'hidden')
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diff changeset
   316
_afs.tag_subject_of(('*', 'wf_info_for', '*'), 'main', 'attributes')
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   317
_afs.tag_subject_of(('*', 'wf_info_for', '*'), 'muledit', 'attributes')
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   318
_afs.tag_object_of(('*', 'wf_info_for', '*'), 'main', 'hidden')
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diff changeset
   319
_afs.tag_subject_of(('CWPermission', 'require_group', '*'), 'main', 'attributes')
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diff changeset
   320
_afs.tag_subject_of(('CWPermission', 'require_group', '*'), 'muledit', 'attributes')
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diff changeset
   321
_afs.tag_attribute(('CWEType', 'final'), 'main', 'hidden')
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diff changeset
   322
_afs.tag_attribute(('CWRType', 'final'), 'main', 'hidden')
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diff changeset
   323
_afs.tag_attribute(('CWUser', 'firstname'), 'main', 'attributes')
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diff changeset
   324
_afs.tag_attribute(('CWUser', 'surname'), 'main', 'attributes')
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_afs.tag_attribute(('CWUser', 'last_login_time'), 'main', 'metadata')
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_afs.tag_subject_of(('CWUser', 'in_group', '*'), 'main', 'attributes')
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_afs.tag_subject_of(('CWUser', 'in_group', '*'), 'muledit', 'attributes')
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_afs.tag_subject_of(('*', 'primary_email', '*'), 'main', 'relations')
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_afs.tag_subject_of(('*', 'use_email', '*'), 'main', 'inlined')
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_afs.tag_subject_of(('CWRelation', 'relation_type', '*'), 'main', 'inlined')
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_afs.tag_subject_of(('CWRelation', 'from_entity', '*'), 'main', 'inlined')
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_afs.tag_subject_of(('CWRelation', 'to_entity', '*'), 'main', 'inlined')
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uicfg.autoform_field_kwargs.tag_attribute(('RQLExpression', 'expression'),
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                                          {'widget': fwdgs.TextInput})
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uicfg.autoform_field_kwargs.tag_subject_of(('TrInfo', 'wf_info_for', '*'),
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                                           {'widget': fwdgs.HiddenInput})
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   338
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def registration_callback(vreg):
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    global etype_relation_field
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    def etype_relation_field(etype, rtype, role='subject'):
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        eschema = vreg.schema.eschema(etype)
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        return AutomaticEntityForm.field_by_name(rtype, role, eschema)
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    vreg.register_all(globals().values(), __name__)