# organization: Logilab
# copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
# contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
# license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
Base form classes
-----------------
.. Note:
Form is the glue that bind a context to a set of fields, and is rendered
using a form renderer. No display is actually done here, though you'll find
some attributes of form that are used to control the rendering process.
Besides the automagic form we'll see later, they are barely two form
classes in |cubicweb|:
.. autoclass:: cubicweb.web.views.forms.FieldsForm
.. autoclass:: cubicweb.web.views.forms.EntityFieldsForm
As you have probably guessed, choosing between them is easy. Simply ask you the
question 'I am editing an entity or not?'. If the answer is yes, use
:class:`EntityFieldsForm`, else use :class:`FieldsForm`.
Actually there exists a third form class:
.. autoclass:: cubicweb.web.views.forms.CompositeForm
but you'll use this one rarely.
"""
__docformat__ = "restructuredtext en"
from warnings import warn
from logilab.common.decorators import iclassmethod
from logilab.common.compat import any
from logilab.common.deprecation import deprecated
from cubicweb import typed_eid
from cubicweb.selectors import non_final_entity, match_kwargs, one_line_rset
from cubicweb.web import uicfg, form, formwidgets as fwdgs
from cubicweb.web.formfields import relvoc_unrelated, guess_field
class FieldsForm(form.Form):
"""This is the base class for fields based forms.
**Attributes**
The following attributes may be either set on subclasses or given on
form selection to customize the generated form:
:attr:`needs_js`
sequence of javascript files that should be added to handle this form
(through :meth:`~cubicweb.web.request.Request.add_js`)
:attr:`needs_css`
sequence of css files that should be added to handle this form (through
:meth:`~cubicweb.web.request.Request.add_css`)
:attr:`domid`
value for the "id" attribute of the <form> tag
:attr:`action`
value for the "action" attribute of the <form> tag
:attr:`onsubmit`
value for the "onsubmit" attribute of the <form> tag
:attr:`cssclass`
value for the "class" attribute of the <form> tag
:attr:`cssstyle`
value for the "style" attribute of the <form> tag
:attr:`cwtarget`
value for the "cubicweb:target" attribute of the <form> tag
:attr:`redirect_path`
relative to redirect to after submitting the form
:attr:`copy_nav_params`
flag telling if navigation parameters should be copied back in hidden
inputs
:attr:`form_buttons`
sequence of form control (:class:`~cubicweb.web.formwidgets.Button`
widgets instances)
:attr:`form_renderer_id`
identifier of the form renderer to use to render the form
:attr:`fieldsets_in_order`
sequence of fieldset names , to control order
**Generic methods**
.. automethod:: cubicweb.web.form.Form.field_by_name(name, role=None)
.. automethod:: cubicweb.web.form.Form.fields_by_name(name, role=None)
**Form construction methods**
.. automethod:: cubicweb.web.form.Form.remove_field(field)
.. automethod:: cubicweb.web.form.Form.append_field(field)
.. automethod:: cubicweb.web.form.Form.insert_field_before(field, name, role=None)
.. automethod:: cubicweb.web.form.Form.insert_field_after(field, name, role=None)
.. automethod:: cubicweb.web.form.Form.add_hidden(name, value=None, **kwargs)
**Form rendering methods**
.. automethod:: cubicweb.web.views.forms.FieldsForm.render
"""
__regid__ = 'base'
# attributes overrideable by subclasses or through __init__
needs_js = ('cubicweb.ajax.js', 'cubicweb.edition.js',)
needs_css = ('cubicweb.form.css',)
action = None
onsubmit = "return freezeFormButtons('%(domid)s');"
cssclass = None
cssstyle = None
cwtarget = None
redirect_path = None
form_buttons = None
form_renderer_id = 'default'
fieldsets_in_order = None
@property
def needs_multipart(self):
"""true if the form needs enctype=multipart/form-data"""
return any(field.needs_multipart for field in self.fields)
def add_media(self):
"""adds media (CSS & JS) required by this widget"""
if self.needs_js:
self._cw.add_js(self.needs_js)
if self.needs_css:
self._cw.add_css(self.needs_css)
def render(self, formvalues=None, rendervalues=None, renderer=None, **kwargs):
"""Render this form, using the `renderer` given as argument or the
default according to :attr:`form_renderer_id`. The rendered form is
returned as an unicode string.
`formvalues` is an optional dictionary containing values that will be
considered as field's value.
Extra keyword arguments will be given to renderer's :meth:`render` method.
`rendervalues` is deprecated.
"""
if rendervalues is not None:
warn('[3.6] rendervalues argument is deprecated, all named arguments will be given instead',
DeprecationWarning, stacklevel=2)
kwargs = rendervalues
self.build_context(formvalues)
if renderer is None:
renderer = self.default_renderer()
return renderer.render(self, kwargs)
def default_renderer(self):
return self._cw.vreg['formrenderers'].select(
self.form_renderer_id, self._cw,
rset=self.cw_rset, row=self.cw_row, col=self.cw_col or 0)
formvalues = None
def build_context(self, formvalues=None):
"""build form context values (the .context attribute which is a
dictionary with field instance as key associated to a dictionary
containing field 'name' (qualified), 'id', 'value' (for display, always
a string).
"""
if self.formvalues is not None:
return # already built
self.formvalues = formvalues or {}
# use a copy in case fields are modified while context is build (eg
# __linkto handling for instance)
for field in self.fields[:]:
for field in field.actual_fields(self):
field.form_init(self)
@deprecated('[3.6] use .add_hidden(name, value, **kwargs)')
def form_add_hidden(self, name, value=None, **kwargs):
return self.add_hidden(name, value, **kwargs)
@deprecated('[3.6] use .render(formvalues, **rendervalues)')
def form_render(self, **values):
"""render this form, using the renderer given in args or the default
FormRenderer()
"""
self.build_context(values)
renderer = values.pop('renderer', None)
if renderer is None:
renderer = self.default_renderer()
return renderer.render(self, values)
_AFF = uicfg.autoform_field
_AFF_KWARGS = uicfg.autoform_field_kwargs
class EntityFieldsForm(FieldsForm):
"""This class is designed for forms used to edit some entities. It should
handle for you all the underlying stuff necessary to properly work with the
generic :class:`~cubicweb.web.views.editcontroller.EditController`.
"""
__regid__ = 'base'
__select__ = (match_kwargs('entity')
| (one_line_rset() & non_final_entity()))
internal_fields = FieldsForm.internal_fields + ('__type', 'eid', '__maineid')
domid = 'entityForm'
@iclassmethod
def field_by_name(cls_or_self, name, role=None, eschema=None):
"""return field with the given name and role. If field is not explicitly
defined for the form but `eclass` is specified, guess_field will be
called.
"""
try:
return super(EntityFieldsForm, cls_or_self).field_by_name(name, role)
except form.FieldNotFound:
if eschema is None or role is None or not name in eschema.schema:
raise
rschema = eschema.schema.rschema(name)
# XXX use a sample target type. Document this.
tschemas = rschema.targets(eschema, role)
fieldcls = _AFF.etype_get(eschema, rschema, role, tschemas[0])
kwargs = _AFF_KWARGS.etype_get(eschema, rschema, role, tschemas[0])
if kwargs is None:
kwargs = {}
if fieldcls:
if not isinstance(fieldcls, type):
return fieldcls # already and instance
return fieldcls(name=name, role=role, eidparam=True, **kwargs)
field = guess_field(eschema, rschema, role, eidparam=True, **kwargs)
if field is None:
raise
return field
def __init__(self, _cw, rset=None, row=None, col=None, **kwargs):
try:
self.edited_entity = kwargs.pop('entity')
except KeyError:
self.edited_entity = rset.complete_entity(row or 0, col or 0)
msg = kwargs.pop('submitmsg', None)
super(EntityFieldsForm, self).__init__(_cw, rset, row, col, **kwargs)
self.add_hidden('__type', self.edited_entity.__regid__, eidparam=True)
self.add_hidden('eid', self.edited_entity.eid)
if kwargs.get('mainform', True): # mainform default to true in parent
self.add_hidden(u'__maineid', self.edited_entity.eid)
# If we need to directly attach the new object to another one
if self._cw.list_form_param('__linkto'):
for linkto in self._cw.list_form_param('__linkto'):
self.add_hidden('__linkto', linkto)
if msg:
msg = '%s %s' % (msg, self._cw._('and linked'))
else:
msg = self._cw._('entity linked')
if msg:
self.add_hidden('__message', msg)
def session_key(self):
"""return the key that may be used to store / retreive data about a
previous post which failed because of a validation error
"""
if self.force_session_key is not None:
return self.force_session_key
# XXX if this is a json request, suppose we should redirect to the
# entity primary view
if self._cw.json_request and self.edited_entity.has_eid():
return '%s#%s' % (self.edited_entity.absolute_url(), self.domid)
# XXX we should not consider some url parameters that may lead to
# different url after a validation error
return '%s#%s' % (self._cw.url(), self.domid)
def build_context(self, formvalues=None):
if self.formvalues is not None:
return # already built
super(EntityFieldsForm, self).build_context(formvalues)
edited = set()
for field in self.fields:
if field.eidparam:
edited.add(field.role_name())
self.add_hidden('_cw_edited_fields', u','.join(edited), eidparam=True)
def default_renderer(self):
return self._cw.vreg['formrenderers'].select(
self.form_renderer_id, self._cw, rset=self.cw_rset, row=self.cw_row,
col=self.cw_col, entity=self.edited_entity)
def should_display_add_new_relation_link(self, rschema, existant, card):
return False
# controller side method (eg POST reception handling)
def actual_eid(self, eid):
# should be either an int (existant entity) or a variable (to be
# created entity)
assert eid or eid == 0, repr(eid) # 0 is a valid eid
try:
return typed_eid(eid)
except ValueError:
try:
return self._cw.data['eidmap'][eid]
except KeyError:
self._cw.data['eidmap'][eid] = None
return None
def editable_relations(self):
return ()
@deprecated('[3.6] use cw.web.formfields.relvoc_unrelated function')
def subject_relation_vocabulary(self, rtype, limit=None):
"""defaut vocabulary method for the given relation, looking for
relation's object entities (i.e. self is the subject)
"""
return relvoc_unrelated(self.edited_entity, rtype, 'subject', limit=None)
@deprecated('[3.6] use cw.web.formfields.relvoc_unrelated function')
def object_relation_vocabulary(self, rtype, limit=None):
return relvoc_unrelated(self.edited_entity, rtype, 'object', limit=None)
class CompositeFormMixIn(object):
__regid__ = 'composite'
form_renderer_id = __regid__
def __init__(self, *args, **kwargs):
super(CompositeFormMixIn, self).__init__(*args, **kwargs)
self.forms = []
def add_subform(self, subform):
"""mark given form as a subform and append it"""
subform.parent_form = self
self.forms.append(subform)
def build_context(self, formvalues=None):
super(CompositeFormMixIn, self).build_context(formvalues)
for form in self.forms:
form.build_context(formvalues)
class CompositeForm(CompositeFormMixIn, FieldsForm):
"""Form composed of sub-forms. Typical usage is edition of multiple entities
at once.
"""
class CompositeEntityForm(CompositeFormMixIn, EntityFieldsForm):
pass # XXX why is this class necessary?