web/views/autoform.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Wed, 29 Apr 2009 12:13:47 +0200
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more rtags api change propagation
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"""The automatic entity form.
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:organization: Logilab
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:copyright: 2001-2009 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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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import 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.form import FieldNotFound, EntityFieldsForm
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from cubicweb.web.formfields import guess_field
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from cubicweb.web.formwidgets import Button, SubmitButton
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from cubicweb.web.views.editforms import toggleable_relation_link, relation_id
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_ = unicode
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class AutomaticEntityForm(EntityFieldsForm):
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    """base automatic form to edit any entity.
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    Designed to be flly generated from schema but highly configurable through:
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    * rtags (rcategories, rfields, rwidgets, inlined, rpermissions)
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    * various standard form parameters
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    You can also easily customise it by adding/removing fields in
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    AutomaticEntityForm instances.
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    """
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    id = '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 = [SubmitButton(stdmsgs.BUTTON_OK),
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                    Button(stdmsgs.BUTTON_APPLY, cwaction='apply'),
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                    Button(stdmsgs.BUTTON_CANCEL, cwaction='cancel')]
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    attrcategories = ('primary', 'secondary')
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    # class attributes below are actually stored in the uicfg module since we
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    # don't want them to be reloaded
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    rcategories = uicfg.rcategories
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    rfields = uicfg.rfields
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    rwidgets = uicfg.rwidgets
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    rinlined = uicfg.rinlined
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    rpermissions_overrides = uicfg.rpermissions_overrides
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    @classmethod
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    def vreg_initialization_completed(cls):
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        """set default category tags for relations where it's not yet defined in
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        the category relation tags
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        """
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        for eschema in cls.schema.entities():
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            for rschema, tschemas, role in eschema.relation_definitions(True):
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                for tschema in tschemas:
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                    if role == 'subject':
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                        X, Y = eschema, tschema
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                        card = rschema.rproperty(X, Y, 'cardinality')[0]
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                        composed = rschema.rproperty(X, Y, 'composite') == 'object'
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                    else:
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                        X, Y = tschema, eschema
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                        card = rschema.rproperty(X, Y, 'cardinality')[1]
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                        composed = rschema.rproperty(X, Y, 'composite') == 'subject'
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                    if not cls.rcategories.get(rschema, role, X, Y):
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                        if card in '1+':
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                            if not rschema.is_final() and composed:
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                                category = 'generated'
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                            else:
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                                category = 'primary'
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                        elif rschema.is_final():
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                            category = 'secondary'
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                        else:
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                            category = 'generic'
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                        cls.rcategories.tag_relation(category, (X, rschema, Y), role)
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    @classmethod
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    def erelations_by_category(cls, entity, categories=None, permission=None, rtags=None):
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        """return a list of (relation schema, target schemas, role) matching
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        categories and permission
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        """
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        if categories is not None:
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            if not isinstance(categories, (list, tuple, set, frozenset)):
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                categories = (categories,)
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            if not isinstance(categories, (set, frozenset)):
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                categories = frozenset(categories)
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        eschema  = entity.e_schema
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        if rtags is None:
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            rtags = cls.rcategories
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        permsoverrides = cls.rpermissions_overrides
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        if entity.has_eid():
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            eid = entity.eid
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        else:
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            eid = None
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        for rschema, targetschemas, role in eschema.relation_definitions(True):
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            # check category first, potentially lower cost than checking
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            # permission which may imply rql queries
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            if categories is not None:
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                targetschemas = [tschema for tschema in targetschemas
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                                 if rtags.etype_get(eschema, rschema, role, tschema) in categories]
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                if not targetschemas:
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                    continue
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            if permission is not None:
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                # tag allowing to hijack the permission machinery when
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                # permission is not verifiable until the entity is actually
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                # created...
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                if eid is None and '%s_on_new' % permission in permsoverrides.etype_get(eschema, rschema, role):
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                    yield (rschema, targetschemas, role)
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                    continue
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                if rschema.is_final():
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                    if not rschema.has_perm(entity.req, permission, eid):
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                        continue
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                elif role == 'subject':
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                    if not ((eid is None and rschema.has_local_role(permission)) or
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                            rschema.has_perm(entity.req, permission, fromeid=eid)):
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                        continue
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                    # on relation with cardinality 1 or ?, we need delete perm as well
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                    # if the relation is already set
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                    if (permission == 'add'
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                        and rschema.cardinality(eschema, targetschemas[0], role) in '1?'
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                        and eid and entity.related(rschema.type, role)
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                        and not rschema.has_perm(entity.req, 'delete', fromeid=eid,
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                                                 toeid=entity.related(rschema.type, role)[0][0])):
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                        continue
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                elif role == 'object':
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                    if not ((eid is None and rschema.has_local_role(permission)) or
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                            rschema.has_perm(entity.req, permission, toeid=eid)):
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                        continue
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                    # on relation with cardinality 1 or ?, we need delete perm as well
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                    # if the relation is already set
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                    if (permission == 'add'
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                        and rschema.cardinality(targetschemas[0], eschema, role) in '1?'
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                        and eid and entity.related(rschema.type, role)
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   132
                        and not rschema.has_perm(entity.req, 'delete', toeid=eid,
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   133
                                                 fromeid=entity.related(rschema.type, role)[0][0])):
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   134
                        continue
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            yield (rschema, targetschemas, role)
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   136
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   137
    @classmethod
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   138
    def esrelations_by_category(cls, entity, categories=None, permission=None):
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   139
        """filter out result of relations_by_category(categories, permission) by
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   140
        removing final relations
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   141
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   142
        return a sorted list of (relation's label, relation'schema, role)
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   143
        """
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   144
        result = []
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   145
        for rschema, ttypes, role in cls.erelations_by_category(
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   146
            entity, categories, permission):
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   147
            if rschema.is_final():
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   148
                continue
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   149
            result.append((rschema.display_name(entity.req, role), rschema, role))
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   150
        return sorted(result)
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   151
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   152
    @iclassmethod
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   153
    def field_by_name(cls_or_self, name, role='subject', eschema=None):
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   154
        """return field with the given name and role. If field is not explicitly
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   155
        defined for the form but `eclass` is specified, guess_field will be
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   156
        called.
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   157
        """
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   158
        try:
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   159
            return super(AutomaticEntityForm, cls_or_self).field_by_name(name, role)
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   160
        except FieldNotFound: # XXX should raise more explicit exception
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   161
            if eschema is None or not name in cls_or_self.schema:
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   162
                raise
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   163
            rschema = cls_or_self.schema.rschema(name)
1540
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parents: 1539
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   164
            fieldcls = cls_or_self.rfields.etype_get(eschema, rschema, role)
1491
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   165
            if fieldcls:
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   166
                return fieldcls(name=name, role=role, eidparam=True)
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parents: 1539
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   167
            widget = cls_or_self.rwidgets.etype_get(eschema, rschema, role)
1491
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   168
            if widget:
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   169
                field = guess_field(eschema, rschema, role,
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   170
                                    eidparam=True, widget=widget)
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   171
            else:
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   172
                field = guess_field(eschema, rschema, role, eidparam=True)
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   173
            if field is None:
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   174
                raise
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   175
            return field
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   176
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   177
    def __init__(self, *args, **kwargs):
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   178
        super(AutomaticEntityForm, self).__init__(*args, **kwargs)
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   179
        entity = self.edited_entity
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   180
        if entity.has_eid():
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   181
            entity.complete()
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   182
        for rschema, role in self.editable_attributes():
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   183
            try:
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   184
                self.field_by_name(rschema.type, role)
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   185
                continue # explicitly specified
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   186
            except FieldNotFound:
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   187
                # has to be guessed
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   188
                try:
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   189
                    field = self.field_by_name(rschema.type, role,
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   190
                                               eschema=entity.e_schema)
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   191
                    self.fields.append(field)
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diff changeset
   192
                except FieldNotFound:
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   193
                    # meta attribute such as <attr>_format
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   194
                    continue
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diff changeset
   195
        self.maxrelitems = self.req.property_value('navigation.related-limit')
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diff changeset
   196
        self.force_display = bool(self.req.form.get('__force_display'))
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diff changeset
   197
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   198
    @property
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diff changeset
   199
    def related_limit(self):
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diff changeset
   200
        if self.force_display:
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diff changeset
   201
            return None
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   202
        return self.maxrelitems + 1
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diff changeset
   203
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diff changeset
   204
    def relations_by_category(self, categories=None, permission=None):
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diff changeset
   205
        """return a list of (relation schema, target schemas, role) matching
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diff changeset
   206
        given category(ies) and permission
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diff changeset
   207
        """
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diff changeset
   208
        return self.erelations_by_category(self.edited_entity, categories,
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diff changeset
   209
                                           permission)
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diff changeset
   210
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diff changeset
   211
    def inlined_relations(self):
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diff changeset
   212
        """return a list of (relation schema, target schemas, role) matching
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parents:
diff changeset
   213
        given category(ies) and permission
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diff changeset
   214
        """
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diff changeset
   215
        # we'll need an initialized varmaker if there are some inlined relation
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diff changeset
   216
        self.initialize_varmaker()
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diff changeset
   217
        return self.erelations_by_category(self.edited_entity, True, 'add', self.rinlined)
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diff changeset
   218
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   219
    def srelations_by_category(self, categories=None, permission=None):
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diff changeset
   220
        """filter out result of relations_by_category(categories, permission) by
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parents:
diff changeset
   221
        removing final relations
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parents:
diff changeset
   222
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   223
        return a sorted list of (relation's label, relation'schema, role)
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parents:
diff changeset
   224
        """
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diff changeset
   225
        return self.esrelations_by_category(self.edited_entity, categories,
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diff changeset
   226
                                           permission)
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diff changeset
   227
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   228
    def action(self):
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diff changeset
   229
        """return the form's action attribute. Default to validateform if not
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   230
        explicitly overriden.
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diff changeset
   231
        """
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diff changeset
   232
        try:
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parents:
diff changeset
   233
            return self._action
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diff changeset
   234
        except AttributeError:
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   235
            return self.build_url('validateform')
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diff changeset
   236
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   237
    def set_action(self, value):
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diff changeset
   238
        """override default action"""
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   239
        self._action = value
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diff changeset
   240
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   241
    action = property(action, set_action)
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diff changeset
   242
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diff changeset
   243
    def editable_attributes(self):
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diff changeset
   244
        """return a list of (relation schema, role) to edit for the entity"""
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   245
        return [(rschema, x) for rschema, _, x in self.relations_by_category(
1528
864ae7c15ef5 other fixlets
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 1498
diff changeset
   246
                self.attrcategories, 'add') if rschema != 'eid']
1491
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   247
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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diff changeset
   248
    def relations_table(self):
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diff changeset
   249
        """yiels 3-tuples (rtype, target, related_list)
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parents:
diff changeset
   250
        where <related_list> itself a list of :
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diff changeset
   251
          - node_id (will be the entity element's DOM id)
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diff changeset
   252
          - appropriate javascript's togglePendingDelete() function call
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diff changeset
   253
          - status 'pendingdelete' or ''
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diff changeset
   254
          - oneline view of related entity
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diff changeset
   255
        """
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   256
        entity = self.edited_entity
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diff changeset
   257
        pending_deletes = self.req.get_pending_deletes(entity.eid)
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parents:
diff changeset
   258
        for label, rschema, role in self.srelations_by_category('generic', 'add'):
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parents:
diff changeset
   259
            relatedrset = entity.related(rschema, role, limit=self.related_limit)
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parents:
diff changeset
   260
            if rschema.has_perm(self.req, 'delete'):
1528
864ae7c15ef5 other fixlets
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 1498
diff changeset
   261
                toggleable_rel_link_func = toggleable_relation_link
1491
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   262
            else:
1528
864ae7c15ef5 other fixlets
Aurelien Campeas <aurelien.campeas@logilab.fr>
parents: 1498
diff changeset
   263
                toggleable_rel_link_func = lambda x, y, z: u''
1491
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   264
            related = []
742aff97dbf7 move AutomaticEntityForm and PrimaryView into their own module
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parents:
diff changeset
   265
            for row in xrange(relatedrset.rowcount):
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parents:
diff changeset
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                nodeid = relation_id(entity.eid, rschema, role,
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                                     relatedrset[row][0])
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                if nodeid in pending_deletes:
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                    status = u'pendingDelete'
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                    label = '+'
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                else:
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                    status = u''
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                    label = 'x'
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                dellink = toggleable_rel_link_func(entity.eid, nodeid, label)
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                eview = self.view('oneline', relatedrset, row=row)
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                related.append((nodeid, dellink, status, eview))
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            yield (rschema, role, related)
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    def restore_pending_inserts(self, cell=False):
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        """used to restore edition page as it was before clicking on
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        'search for <some entity type>'
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        """
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        eid = self.edited_entity.eid
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        cell = cell and "div_insert_" or "tr"
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        pending_inserts = set(self.req.get_pending_inserts(eid))
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        for pendingid in pending_inserts:
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            eidfrom, rtype, eidto = pendingid.split(':')
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            if typed_eid(eidfrom) == eid: # subject
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                label = display_name(self.req, rtype, 'subject')
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                reid = eidto
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            else:
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                label = display_name(self.req, rtype, 'object')
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                reid = eidfrom
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            jscall = "javascript: cancelPendingInsert('%s', '%s', null, %s);" \
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                     % (pendingid, cell, eid)
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            rset = self.req.eid_rset(reid)
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            eview = self.view('text', rset, row=0)
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            # XXX find a clean way to handle baskets
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            if rset.description[0][0] == 'Basket':
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                eview = '%s (%s)' % (eview, display_name(self.req, 'Basket'))
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            yield rtype, pendingid, jscall, label, reid, eview
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    # should_* method extracted to allow overriding
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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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        """
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        return self.rinlined.etype_get(self.edited_entity.id, rschema, role, targettype)
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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+'
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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 '+*'
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def etype_relation_field(etype, rtype, role='subject'):
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    eschema = AutomaticEntityForm.schema.eschema(etype)
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    return AutomaticEntityForm.field_by_name(rtype, role, eschema)