web/form.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 22 Dec 2009 21:02:37 +0100
branchstable
changeset 4195 86dcaf6bb92f
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child 3998 94cc7cad3d2d
child 4212 ab6573088b4a
permissions -rw-r--r--
closes #601987 1) sqlutils.restore_from_file have to use its confirm argument when a command fail, to propose to continue there (this can't be handled by the caller) 2) source.restore method hence needs to take this confirmation callback as argument 3) properly fix places where 'drop' was given instead of 'confirm'
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"""abstract form classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2009 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 logilab.common.decorators import iclassmethod
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from cubicweb.appobject import AppObject
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from cubicweb.view import NOINDEX, NOFOLLOW
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from cubicweb.common import tags
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from cubicweb.web import stdmsgs, httpcache, formfields
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class FormViewMixIn(object):
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    """abstract form view mix-in"""
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    category = 'form'
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    controller = 'edit'
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    http_cache_manager = httpcache.NoHTTPCacheManager
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    add_to_breadcrumbs = False
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    def html_headers(self):
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        """return a list of html headers (eg something to be inserted between
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        <head> and </head> of the returned page
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        by default forms are neither indexed nor followed
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        """
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        return [NOINDEX, NOFOLLOW]
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    def linkable(self):
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        """override since forms are usually linked by an action,
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        so we don't want them to be listed by appli.possible_views
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        """
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        return False
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# XXX should disappear
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class FormMixIn(object):
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    """abstract form mix-in
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    XXX: you should inherit from this FIRST (obscure pb with super call)
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    """
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    force_session_key = None
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    def session_key(self):
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        """return the key that may be used to store / retreive data about a
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        previous post which failed because of a validation error
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        """
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        if self.force_session_key is None:
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            return '%s#%s' % (self.req.url(), self.domid)
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        return self.force_session_key
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    def restore_previous_post(self, sessionkey):
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        # get validation session data which may have been previously set.
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        # deleting validation errors here breaks form reloading (errors are
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        # no more available), they have to be deleted by application's publish
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        # method on successful commit
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        forminfo = self.req.get_session_data(sessionkey, pop=True)
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        if forminfo:
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            # XXX remove req.data assigment once cw.web.widget is killed
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            self.req.data['formvalues'] = self._form_previous_values = forminfo['values']
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            self.req.data['formerrors'] = self._form_valerror = forminfo['errors']
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            self.req.data['displayederrors'] = self.form_displayed_errors = set()
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            # if some validation error occured on entity creation, we have to
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            # get the original variable name from its attributed eid
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            foreid = self.form_valerror.entity
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            for var, eid in forminfo['eidmap'].items():
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                if foreid == eid:
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                    self.form_valerror.eid = var
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                    break
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            else:
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                self.form_valerror.eid = foreid
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        else:
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            self._form_previous_values = {}
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            self._form_valerror = None
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    @property
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    def form_previous_values(self):
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        if self.parent_form is None:
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            return self._form_previous_values
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        return self.parent_form.form_previous_values
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    @property
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    def form_valerror(self):
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        if self.parent_form is None:
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            return self._form_valerror
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        return self.parent_form.form_valerror
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    # XXX deprecated with new form system. Should disappear
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    domid = 'entityForm'
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    category = 'form'
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    controller = 'edit'
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    http_cache_manager = httpcache.NoHTTPCacheManager
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    add_to_breadcrumbs = False
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    def html_headers(self):
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        """return a list of html headers (eg something to be inserted between
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        <head> and </head> of the returned page
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        by default forms are neither indexed nor followed
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        """
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        return [NOINDEX, NOFOLLOW]
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    def linkable(self):
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        """override since forms are usually linked by an action,
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        so we don't want them to be listed by appli.possible_views
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        """
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        return False
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    def button(self, label, klass='validateButton', tabindex=None, **kwargs):
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        if tabindex is None:
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            tabindex = self.req.next_tabindex()
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        return tags.input(value=label, klass=klass, **kwargs)
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    def action_button(self, label, onclick=None, __action=None, **kwargs):
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        if onclick is None:
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            onclick = "postForm('__action_%s', \'%s\', \'%s\')" % (
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                __action, label, self.domid)
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        return self.button(label, onclick=onclick, **kwargs)
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    def button_ok(self, label=None, type='submit', name='defaultsubmit',
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                  **kwargs):
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        label = self.req._(label or stdmsgs.BUTTON_OK).capitalize()
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        return self.button(label, name=name, type=type, **kwargs)
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    def button_apply(self, label=None, type='button', **kwargs):
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        label = self.req._(label or stdmsgs.BUTTON_APPLY).capitalize()
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        return self.action_button(label, __action='apply', type=type, **kwargs)
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    def button_delete(self, label=None, type='button', **kwargs):
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        label = self.req._(label or stdmsgs.BUTTON_DELETE).capitalize()
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        return self.action_button(label, __action='delete', type=type, **kwargs)
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    def button_cancel(self, label=None, type='button', **kwargs):
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        label = self.req._(label or stdmsgs.BUTTON_CANCEL).capitalize()
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        return self.action_button(label, __action='cancel', type=type, **kwargs)
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    def button_reset(self, label=None, type='reset', name='__action_cancel',
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                     **kwargs):
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        label = self.req._(label or stdmsgs.BUTTON_CANCEL).capitalize()
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        return self.button(label, type=type, **kwargs)
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    def need_multipart(self, entity, categories=('primary', 'secondary')):
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        """return a boolean indicating if form's enctype should be multipart
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        """
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        for rschema, _, x in entity.relations_by_category(categories):
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            if entity.get_widget(rschema, x).need_multipart:
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                return True
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        # let's find if any of our inlined entities needs multipart
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        for rschema, targettypes, x in entity.relations_by_category('inlineview'):
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            assert len(targettypes) == 1, \
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                   "I'm not able to deal with several targets and inlineview"
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            ttype = targettypes[0]
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            inlined_entity = self.vreg.etype_class(ttype)(self.req, None, None)
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            for irschema, _, x in inlined_entity.relations_by_category(categories):
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                if inlined_entity.get_widget(irschema, x).need_multipart:
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                    return True
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        return False
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0
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    def error_message(self):
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        """return formatted error message
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        This method should be called once inlined field errors has been consumed
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        """
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        errex = self.req.data.get('formerrors') or self.form_valerror
0
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        # get extra errors
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        if errex is not None:
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            errormsg = self.req._('please correct the following errors:')
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            displayed = self.req.data.get('displayederrors') or self.form_displayed_errors
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            errors = sorted((field, err) for field, err in errex.errors.items()
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                            if not field in displayed)
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            if errors:
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                if len(errors) > 1:
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                    templstr = '<li>%s</li>\n'
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                else:
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                    templstr = '&#160;%s\n'
0
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                for field, err in errors:
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                    if field is None:
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                        errormsg += templstr % err
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                    else:
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                        errormsg += templstr % '%s: %s' % (self.req._(field), err)
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                if len(errors) > 1:
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                    errormsg = '<ul>%s</ul>' % errormsg
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            return u'<div class="errorMessage">%s</div>' % errormsg
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        return u''
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###############################################################################
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class metafieldsform(type):
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    """metaclass for FieldsForm to retrieve fields defined as class attributes
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    and put them into a single ordered list: '_fields_'.
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    """
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    def __new__(mcs, name, bases, classdict):
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        allfields = []
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        for base in bases:
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            if hasattr(base, '_fields_'):
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                allfields += base._fields_
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        clsfields = (item for item in classdict.items()
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                     if isinstance(item[1], formfields.Field))
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        for fieldname, field in sorted(clsfields, key=lambda x: x[1].creation_rank):
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            if not field.name:
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                field.set_name(fieldname)
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            allfields.append(field)
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        classdict['_fields_'] = allfields
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        return super(metafieldsform, mcs).__new__(mcs, name, bases, classdict)
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class FieldNotFound(Exception):
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    """raised by field_by_name when a field with the given name has not been
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    found
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    """
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class Form(FormMixIn, AppObject):
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    __metaclass__ = metafieldsform
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    __registry__ = 'forms'
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    parent_form = None
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    @property
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    def root_form(self):
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        """return the root form"""
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        if self.parent_form is None:
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            return self
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        return self.parent_form.root_form
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    @iclassmethod
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    def _fieldsattr(cls_or_self):
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        if isinstance(cls_or_self, type):
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            fields = cls_or_self._fields_
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        else:
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            fields = cls_or_self.fields
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        return fields
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    @iclassmethod
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    def field_by_name(cls_or_self, name, role='subject'):
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        """return field with the given name and role.
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        Raise FieldNotFound if the field can't be found.
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        """
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        for field in cls_or_self._fieldsattr():
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            if field.name == name and field.role == role:
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                return field
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        raise FieldNotFound(name)
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    @iclassmethod
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    def fields_by_name(cls_or_self, name, role='subject'):
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        """return a list of fields with the given name and role"""
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        return [field for field in cls_or_self._fieldsattr()
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                if field.name == name and field.role == role]
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    @iclassmethod
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    def remove_field(cls_or_self, field):
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        """remove a field from form class or instance"""
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        cls_or_self._fieldsattr().remove(field)
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    @iclassmethod
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    def append_field(cls_or_self, field):
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        """append a field to form class or instance"""
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        cls_or_self._fieldsattr().append(field)
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    @iclassmethod
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    def insert_field_before(cls_or_self, new_field, name, role='subject'):
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        field = cls_or_self.field_by_name(name, role)
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        fields = cls_or_self._fieldsattr()
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        fields.insert(fields.index(field), new_field)
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    @iclassmethod
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    def insert_field_after(cls_or_self, new_field, name, role='subject'):
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        field = cls_or_self.field_by_name(name, role)
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        fields = cls_or_self._fieldsattr()
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        fields.insert(fields.index(field)+1, new_field)