web/views/forms.py
author Alexandre Fayolle <alexandre.fayolle@logilab.fr>
Sat, 29 May 2010 10:33:40 +0200
branchstable
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""
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Base form classes
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-----------------
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.. Note:
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   Form is the glue that bind a context to a set of fields, and is rendered
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   using a form renderer. No display is actually done here, though you'll find
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   some attributes of form that are used to control the rendering process.
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Besides the automagic form we'll see later, there are roughly two main
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form classes in |cubicweb|:
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.. autoclass:: cubicweb.web.views.forms.FieldsForm
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.. autoclass:: cubicweb.web.views.forms.EntityFieldsForm
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As you have probably guessed, choosing between them is easy. Simply ask you the
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question 'I am editing an entity or not?'. If the answer is yes, use
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:class:`EntityFieldsForm`, else use :class:`FieldsForm`.
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Actually there exists a third form class:
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.. autoclass:: cubicweb.web.views.forms.CompositeForm
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but you'll use this one rarely.
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"""
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__docformat__ = "restructuredtext en"
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from warnings import warn
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from logilab.common.decorators import iclassmethod
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from logilab.common.compat import any
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from logilab.common.deprecation import deprecated
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from cubicweb import typed_eid
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from cubicweb.selectors import non_final_entity, match_kwargs, one_line_rset
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from cubicweb.web import uicfg, form, formwidgets as fwdgs
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from cubicweb.web.formfields import relvoc_unrelated, guess_field
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class FieldsForm(form.Form):
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    """This is the base class for fields based forms.
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    **Attributes**
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    The following attributes may be either set on subclasses or given on
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    form selection to customize the generated form:
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    :attr:`needs_js`
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      sequence of javascript files that should be added to handle this form
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      (through :meth:`~cubicweb.web.request.Request.add_js`)
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    :attr:`needs_css`
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      sequence of css files that should be added to handle this form (through
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      :meth:`~cubicweb.web.request.Request.add_css`)
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    :attr:`domid`
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      value for the "id" attribute of the <form> tag
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    :attr:`action`
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      value for the "action" attribute of the <form> tag
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    :attr:`onsubmit`
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      value for the "onsubmit" attribute of the <form> tag
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    :attr:`cssclass`
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      value for the "class" attribute of the <form> tag
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    :attr:`cssstyle`
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      value for the "style" attribute of the <form> tag
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    :attr:`cwtarget`
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      value for the "cubicweb:target" attribute of the <form> tag
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    :attr:`redirect_path`
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      relative to redirect to after submitting the form
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    :attr:`copy_nav_params`
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      flag telling if navigation parameters should be copied back in hidden
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      inputs
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    :attr:`form_buttons`
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      sequence of form control (:class:`~cubicweb.web.formwidgets.Button`
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      widgets instances)
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    :attr:`form_renderer_id`
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      identifier of the form renderer to use to render the form
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    :attr:`fieldsets_in_order`
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      sequence of fieldset names , to control order
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    **Generic methods**
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    .. automethod:: cubicweb.web.form.Form.field_by_name(name, role=None)
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    .. automethod:: cubicweb.web.form.Form.fields_by_name(name, role=None)
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    **Form construction methods**
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    .. automethod:: cubicweb.web.form.Form.remove_field(field)
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    .. automethod:: cubicweb.web.form.Form.append_field(field)
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    .. automethod:: cubicweb.web.form.Form.insert_field_before(field, name, role=None)
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    .. automethod:: cubicweb.web.form.Form.insert_field_after(field, name, role=None)
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    .. automethod:: cubicweb.web.form.Form.add_hidden(name, value=None, **kwargs)
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    **Form rendering methods**
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    .. automethod:: cubicweb.web.views.forms.FieldsForm.render
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    """
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    __regid__ = 'base'
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    # attributes overrideable by subclasses or through __init__
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    needs_js = ('cubicweb.ajax.js', 'cubicweb.edition.js',)
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    needs_css = ('cubicweb.form.css',)
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    action = None
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    onsubmit = "return freezeFormButtons('%(domid)s');"
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    cssclass = None
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    cssstyle = None
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    cwtarget = None
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    redirect_path = None
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    form_buttons = None
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    form_renderer_id = 'default'
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    fieldsets_in_order = None
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    @property
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    def needs_multipart(self):
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        """true if the form needs enctype=multipart/form-data"""
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        return any(field.needs_multipart for field in self.fields)
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    def add_media(self):
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        """adds media (CSS & JS) required by this widget"""
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        if self.needs_js:
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            self._cw.add_js(self.needs_js)
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        if self.needs_css:
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            self._cw.add_css(self.needs_css)
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    def render(self, formvalues=None, rendervalues=None, renderer=None, **kwargs):
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        """Render this form, using the `renderer` given as argument or the
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        default according to :attr:`form_renderer_id`. The rendered form is
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        returned as an unicode string.
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        `formvalues` is an optional dictionary containing values that will be
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        considered as field's value.
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        Extra keyword arguments will be given to renderer's :meth:`render` method.
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        `rendervalues` is deprecated.
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        """
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        if rendervalues is not None:
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            warn('[3.6] rendervalues argument is deprecated, all named arguments will be given instead',
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                 DeprecationWarning, stacklevel=2)
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            kwargs = rendervalues
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        self.build_context(formvalues)
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        if renderer is None:
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            renderer = self.default_renderer()
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        return renderer.render(self, kwargs)
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    def default_renderer(self):
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        return self._cw.vreg['formrenderers'].select(
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            self.form_renderer_id, self._cw,
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            rset=self.cw_rset, row=self.cw_row, col=self.cw_col or 0)
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    formvalues = None
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    def build_context(self, formvalues=None):
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        """build form context values (the .context attribute which is a
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        dictionary with field instance as key associated to a dictionary
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        containing field 'name' (qualified), 'id', 'value' (for display, always
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        a string).
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        """
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        if self.formvalues is not None:
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            return # already built
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        self.formvalues = formvalues or {}
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        # use a copy in case fields are modified while context is build (eg
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        # __linkto handling for instance)
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        for field in self.fields[:]:
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            for field in field.actual_fields(self):
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                field.form_init(self)
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    _default_form_action_path = 'edit'
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    def form_action(self):
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        if self.action is None:
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            return self._cw.build_url(self._default_form_action_path)
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        return self.action
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    @deprecated('[3.6] use .add_hidden(name, value, **kwargs)')
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    def form_add_hidden(self, name, value=None, **kwargs):
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        return self.add_hidden(name, value, **kwargs)
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    @deprecated('[3.6] use .render(formvalues, **rendervalues)')
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    def form_render(self, **values):
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        """render this form, using the renderer given in args or the default
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        FormRenderer()
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        """
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        self.build_context(values)
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        renderer = values.pop('renderer', None)
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        if renderer is None:
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            renderer = self.default_renderer()
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        return renderer.render(self, values)
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   218
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   219
_AFF = uicfg.autoform_field
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_AFF_KWARGS = uicfg.autoform_field_kwargs
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   222
class EntityFieldsForm(FieldsForm):
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   223
    """This class is designed for forms used to edit some entities. It should
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   224
    handle for you all the underlying stuff necessary to properly work with the
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   225
    generic :class:`~cubicweb.web.views.editcontroller.EditController`.
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   226
    """
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   227
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diff changeset
   228
    __regid__ = 'base'
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   229
    __select__ = (match_kwargs('entity')
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   230
                  | (one_line_rset() & non_final_entity()))
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   231
    domid = 'entityForm'
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   232
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   233
    @iclassmethod
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   234
    def field_by_name(cls_or_self, name, role=None, eschema=None):
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diff changeset
   235
        """return field with the given name and role. If field is not explicitly
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diff changeset
   236
        defined for the form but `eclass` is specified, guess_field will be
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   237
        called.
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   238
        """
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diff changeset
   239
        try:
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   240
            return super(EntityFieldsForm, cls_or_self).field_by_name(name, role)
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diff changeset
   241
        except form.FieldNotFound:
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diff changeset
   242
            if eschema is None or role is None or not name in eschema.schema:
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parents: 4252
diff changeset
   243
                raise
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diff changeset
   244
            rschema = eschema.schema.rschema(name)
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parents: 4252
diff changeset
   245
            # XXX use a sample target type. Document this.
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parents: 4252
diff changeset
   246
            tschemas = rschema.targets(eschema, role)
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parents: 4252
diff changeset
   247
            fieldcls = _AFF.etype_get(eschema, rschema, role, tschemas[0])
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diff changeset
   248
            kwargs = _AFF_KWARGS.etype_get(eschema, rschema, role, tschemas[0])
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diff changeset
   249
            if kwargs is None:
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diff changeset
   250
                kwargs = {}
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diff changeset
   251
            if fieldcls:
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diff changeset
   252
                if not isinstance(fieldcls, type):
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parents: 4252
diff changeset
   253
                    return fieldcls # already and instance
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diff changeset
   254
                return fieldcls(name=name, role=role, eidparam=True, **kwargs)
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parents: 4252
diff changeset
   255
            field = guess_field(eschema, rschema, role, eidparam=True, **kwargs)
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parents: 4252
diff changeset
   256
            if field is None:
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diff changeset
   257
                raise
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diff changeset
   258
            return field
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parents: 4252
diff changeset
   259
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diff changeset
   260
    def __init__(self, _cw, rset=None, row=None, col=None, **kwargs):
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parents: 4252
diff changeset
   261
        try:
4206
cebdf8ee5ad7 [forms] edited_entity must be set before calling session_key()
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parents: 4134
diff changeset
   262
            self.edited_entity = kwargs.pop('entity')
4257
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parents: 4252
diff changeset
   263
        except KeyError:
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6c4f109c2b03 backport stable branch
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parents: 4248 4212
diff changeset
   264
            self.edited_entity = rset.complete_entity(row or 0, col or 0)
2005
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parents:
diff changeset
   265
        msg = kwargs.pop('submitmsg', None)
4257
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parents: 4252
diff changeset
   266
        super(EntityFieldsForm, self).__init__(_cw, rset, row, col, **kwargs)
4659
f8326ff98f37 [form] complete 25de2eb0432b by ignore req parameters by default for all hidden fields
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parents: 4658
diff changeset
   267
        self.add_hidden('__type', self.edited_entity.__regid__, eidparam=True)
f8326ff98f37 [form] complete 25de2eb0432b by ignore req parameters by default for all hidden fields
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parents: 4658
diff changeset
   268
        self.add_hidden('eid', self.edited_entity.eid)
2080
3ea388b5b9d8 oops, mainform default to True
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2050
diff changeset
   269
        if kwargs.get('mainform', True): # mainform default to true in parent
4164
119a374c5eb4 form_add_hidden -> add_hidden
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4162
diff changeset
   270
            self.add_hidden(u'__maineid', self.edited_entity.eid)
2005
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parents:
diff changeset
   271
            # If we need to directly attach the new object to another one
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   272
            if self._cw.list_form_param('__linkto'):
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
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parents: 3396
diff changeset
   273
                for linkto in self._cw.list_form_param('__linkto'):
4164
119a374c5eb4 form_add_hidden -> add_hidden
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parents: 4162
diff changeset
   274
                    self.add_hidden('__linkto', linkto)
2050
ce184fdb1e56 fix submit message handling in entity form
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2049
diff changeset
   275
                if msg:
3451
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parents: 3396
diff changeset
   276
                    msg = '%s %s' % (msg, self._cw._('and linked'))
2050
ce184fdb1e56 fix submit message handling in entity form
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parents: 2049
diff changeset
   277
                else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   278
                    msg = self._cw._('entity linked')
2050
ce184fdb1e56 fix submit message handling in entity form
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parents: 2049
diff changeset
   279
        if msg:
4164
119a374c5eb4 form_add_hidden -> add_hidden
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parents: 4162
diff changeset
   280
            self.add_hidden('__message', msg)
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
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parents:
diff changeset
   281
3922
69020a7c234a refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value
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parents: 3880
diff changeset
   282
    def session_key(self):
69020a7c234a refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value
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diff changeset
   283
        """return the key that may be used to store / retreive data about a
69020a7c234a refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3880
diff changeset
   284
        previous post which failed because of a validation error
69020a7c234a refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3880
diff changeset
   285
        """
4133
24ffe983abfc force_session_key default to None in base form class...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3953
diff changeset
   286
        if self.force_session_key is not None:
3922
69020a7c234a refactor session_key (__errorurl) to handle cases where the form is generated throuhg an ajax call: in case of an entity form, return the entity's absolute url. Also allow to force session key value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3880
diff changeset
   287
            return self.force_session_key
4133
24ffe983abfc force_session_key default to None in base form class...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3953
diff changeset
   288
        # XXX if this is a json request, suppose we should redirect to the
24ffe983abfc force_session_key default to None in base form class...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3953
diff changeset
   289
        # entity primary view
4183
b5aa030bb2f9 use ._cw instead of .req (reintroduced by merge of stable)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4181
diff changeset
   290
        if self._cw.json_request and self.edited_entity.has_eid():
4133
24ffe983abfc force_session_key default to None in base form class...
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3953
diff changeset
   291
            return '%s#%s' % (self.edited_entity.absolute_url(), self.domid)
4662
79c0788ba7f6 add XXX note
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4660
diff changeset
   292
        # XXX we should not consider some url parameters that may lead to
79c0788ba7f6 add XXX note
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parents: 4660
diff changeset
   293
        # different url after a validation error
4183
b5aa030bb2f9 use ._cw instead of .req (reintroduced by merge of stable)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4181
diff changeset
   294
        return '%s#%s' % (self._cw.url(), self.domid)
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   295
4159
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   296
    def build_context(self, formvalues=None):
4248
d375643eea43 don't add another _cw_edited_field hidden when build_context is called twice (may occurs with inlined relation forms)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4236
diff changeset
   297
        if self.formvalues is not None:
d375643eea43 don't add another _cw_edited_field hidden when build_context is called twice (may occurs with inlined relation forms)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4236
diff changeset
   298
            return # already built
4159
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   299
        super(EntityFieldsForm, self).build_context(formvalues)
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   300
        edited = set()
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
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parents: 4156
diff changeset
   301
        for field in self.fields:
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
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parents: 4156
diff changeset
   302
            if field.eidparam:
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   303
                edited.add(field.role_name())
4660
21ed77792c33 cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4659
diff changeset
   304
        self.add_hidden('_cw_edited_fields', u','.join(edited), eidparam=True)
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   305
4164
119a374c5eb4 form_add_hidden -> add_hidden
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4162
diff changeset
   306
    def default_renderer(self):
3451
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   307
        return self._cw.vreg['formrenderers'].select(
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   308
            self.form_renderer_id, self._cw, rset=self.cw_rset, row=self.cw_row,
6b46d73823f5 [api] work in progress, use __regid__, cw_*, etc.
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 3396
diff changeset
   309
            col=self.cw_col, entity=self.edited_entity)
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   310
4583
356f08325072 cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4284
diff changeset
   311
    def should_display_add_new_relation_link(self, rschema, existant, card):
356f08325072 cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4284
diff changeset
   312
        return False
356f08325072 cleanup
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4284
diff changeset
   313
4167
73e649a7797d fix render (formerly form_render) prototype
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4164
diff changeset
   314
    # controller side method (eg POST reception handling)
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   315
4159
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   316
    def actual_eid(self, eid):
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   317
        # should be either an int (existant entity) or a variable (to be
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   318
        # created entity)
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   319
        assert eid or eid == 0, repr(eid) # 0 is a valid eid
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   320
        try:
4159
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   321
            return typed_eid(eid)
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   322
        except ValueError:
2005
e8032965f37a turn every form class into appobject. They should not be instantiated manually anymore.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   323
            try:
4159
6b2b20c73d59 refactor form field value handling, to get a nicer api and an easier algorithm to get field's value
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4156
diff changeset
   324
                return self._cw.data['eidmap'][eid]
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            except KeyError:
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                self._cw.data['eidmap'][eid] = None
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                return None
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    def editable_relations(self):
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        return ()
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    @deprecated('[3.6] use cw.web.formfields.relvoc_unrelated function')
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    def subject_relation_vocabulary(self, rtype, limit=None):
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        """defaut vocabulary method for the given relation, looking for
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        relation's object entities (i.e. self is the subject)
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        """
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        return relvoc_unrelated(self.edited_entity, rtype, 'subject', limit=None)
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    @deprecated('[3.6] use cw.web.formfields.relvoc_unrelated function')
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    def object_relation_vocabulary(self, rtype, limit=None):
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        return relvoc_unrelated(self.edited_entity, rtype, 'object', limit=None)
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class CompositeFormMixIn(object):
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    __regid__ = 'composite'
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    form_renderer_id = __regid__
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    def __init__(self, *args, **kwargs):
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        super(CompositeFormMixIn, self).__init__(*args, **kwargs)
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        self.forms = []
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    def add_subform(self, subform):
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        """mark given form as a subform and append it"""
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        subform.parent_form = self
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        self.forms.append(subform)
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    def build_context(self, formvalues=None):
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        super(CompositeFormMixIn, self).build_context(formvalues)
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        for form in self.forms:
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            form.build_context(formvalues)
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class CompositeForm(CompositeFormMixIn, FieldsForm):
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    """Form composed of sub-forms. Typical usage is edition of multiple entities
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    at once.
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    """
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class CompositeEntityForm(CompositeFormMixIn, EntityFieldsForm):
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    pass # XXX why is this class necessary?