"""The edit controller, handling form submitting.
:organization: Logilab
:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
"""
__docformat__ = "restructuredtext en"
from decimal import Decimal
from rql.utils import rqlvar_maker
from cubicweb import Binary, ValidationError, typed_eid
from cubicweb.web import INTERNAL_FIELD_VALUE, RequestError, NothingToEdit
from cubicweb.web.controller import parse_relations_descr
from cubicweb.web.views.basecontrollers import ViewController
class ToDoLater(Exception):
"""exception used in the edit controller to indicate that a relation
can't be handled right now and have to be handled later
"""
class EditController(ViewController):
id = 'edit'
def publish(self, rset=None, fromjson=False):
"""edit / create / copy / delete entity / relations"""
self.fromjson = fromjson
for key in self.req.form:
# There should be 0 or 1 action
if key.startswith('__action_'):
cbname = key[1:]
try:
callback = getattr(self, cbname)
except AttributeError:
raise RequestError(self.req._('invalid action %r' % key))
else:
return callback()
self._default_publish()
self.reset()
def _default_publish(self):
req = self.req
form = req.form
# no specific action, generic edition
self._to_create = req.data['eidmap'] = {}
self._pending_relations = []
todelete = self.req.get_pending_deletes()
toinsert = self.req.get_pending_inserts()
try:
methodname = form.pop('__method', None)
for eid in req.edited_eids():
formparams = req.extract_entity_params(eid)
if methodname is not None:
entity = req.eid_rset(eid).get_entity(0, 0)
method = getattr(entity, methodname)
method(formparams)
eid = self.edit_entity(formparams)
except (RequestError, NothingToEdit):
if '__linkto' in form and 'eid' in form:
self.execute_linkto()
elif not ('__delete' in form or '__insert' in form or todelete or toinsert):
raise ValidationError(None, {None: req._('nothing to edit')})
# handle relations in newly created entities
if self._pending_relations:
for rschema, formparams, x, entity in self._pending_relations:
self.handle_relation(rschema, formparams, x, entity, True)
# XXX this processes *all* pending operations of *all* entities
if form.has_key('__delete'):
todelete += req.list_form_param('__delete', form, pop=True)
if todelete:
self.delete_relations(parse_relations_descr(todelete))
if form.has_key('__insert'):
toinsert = req.list_form_param('__insert', form, pop=True)
if toinsert:
self.insert_relations(parse_relations_descr(toinsert))
self.req.remove_pending_operations()
def edit_entity(self, formparams, multiple=False):
"""edit / create / copy an entity and return its eid"""
etype = formparams['__type']
entity = self.vreg.etype_class(etype)(self.req, None, None)
entity.eid = eid = self._get_eid(formparams['eid'])
edited = self.req.form.get('__maineid') == formparams['eid']
# let a chance to do some entity specific stuff.
entity.pre_web_edit()
# create a rql query from parameters
self.relations = []
self.restrictions = []
# process inlined relations at the same time as attributes
# this is required by some external source such as the svn source which
# needs some information provided by those inlined relation. Moreover
# this will generate less write queries.
for rschema in entity.e_schema.subject_relations():
if rschema.is_final():
self.handle_attribute(entity, rschema, formparams)
elif rschema.inlined:
self.handle_inlined_relation(rschema, formparams, entity)
execute = self.req.execute
if eid is None: # creation or copy
if self.relations:
rql = 'INSERT %s X: %s' % (etype, ','.join(self.relations))
else:
rql = 'INSERT %s X' % etype
if self.restrictions:
rql += ' WHERE %s' % ','.join(self.restrictions)
try:
# get the new entity (in some cases, the type might have
# changed as for the File --> Image mutation)
entity = execute(rql, formparams).get_entity(0, 0)
eid = entity.eid
except ValidationError, ex:
# ex.entity may be an int or an entity instance
self._to_create[formparams['eid']] = ex.entity
if self.fromjson:
ex.entity = formparams['eid']
raise
self._to_create[formparams['eid']] = eid
elif self.relations: # edition of an existant entity
varmaker = rqlvar_maker()
var = varmaker.next()
while var in formparams:
var = varmaker.next()
rql = 'SET %s WHERE X eid %%(%s)s' % (','.join(self.relations), var)
if self.restrictions:
rql += ', %s' % ','.join(self.restrictions)
formparams[var] = eid
execute(rql, formparams)
for rschema in entity.e_schema.subject_relations():
if rschema.is_final() or rschema.inlined:
continue
self.handle_relation(rschema, formparams, 'subject', entity)
for rschema in entity.e_schema.object_relations():
if rschema.is_final():
continue
self.handle_relation(rschema, formparams, 'object', entity)
if edited:
self.notify_edited(entity)
if formparams.has_key('__delete'):
todelete = self.req.list_form_param('__delete', formparams, pop=True)
self.delete_relations(parse_relations_descr(todelete))
if formparams.has_key('__cloned_eid'):
entity.copy_relations(formparams['__cloned_eid'])
if formparams.has_key('__insert'):
toinsert = self.req.list_form_param('__insert', formparams, pop=True)
self.insert_relations(parse_relations_descr(toinsert))
if edited: # only execute linkto for the main entity
self.execute_linkto(eid)
return eid
def _action_apply(self):
self._default_publish()
self.reset()
def _action_cancel(self):
errorurl = self.req.form.get('__errorurl')
if errorurl:
self.req.cancel_edition(errorurl)
return self.reset()
def _action_delete(self):
self.delete_entities(self.req.edited_eids(withtype=True))
return self.reset()
def _needs_edition(self, rtype, formparams, entity):
"""returns True and and the new value if `rtype` was edited"""
editkey = 'edits-%s' % rtype
if not editkey in formparams:
return False, None # not edited
value = formparams.get(rtype) or None
if entity.has_eid() and (formparams.get(editkey) or None) == value:
return False, None # not modified
if value == INTERNAL_FIELD_VALUE:
value = None
return True, value
def handle_attribute(self, entity, rschema, formparams):
"""append to `relations` part of the rql query to edit the
attribute described by the given schema if necessary
"""
attr = rschema.type
edition_needed, value = self._needs_edition(attr, formparams, entity)
if not edition_needed:
return
# test if entity class defines a special handler for this attribute
custom_edit = getattr(entity, 'custom_%s_edit' % attr, None)
if custom_edit:
custom_edit(formparams, value, self.relations)
return
attrtype = rschema.objects(entity.e_schema)[0].type
# on checkbox or selection, the field may not be in params
if attrtype == 'Boolean':
value = bool(value)
elif attrtype == 'Decimal':
value = Decimal(value)
elif attrtype == 'Bytes':
# if it is a file, transport it using a Binary (StringIO)
# XXX later __detach is for the new widget system, the former is to
# be removed once web/widgets.py has been dropped
if formparams.has_key('__%s_detach' % attr) or formparams.has_key('%s__detach' % attr):
# drop current file value
value = None
# no need to check value when nor explicit detach nor new file
# submitted, since it will think the attribute is not modified
elif isinstance(value, unicode):
# file modified using a text widget
encoding = entity.attr_metadata(attr, 'encoding')
value = Binary(value.encode(encoding))
else:
# value is a 3-uple (filename, mimetype, stream)
val = Binary(value[2].read())
if not val.getvalue(): # usually an unexistant file
value = None
else:
val.filename = value[0]
# ignore browser submitted MIME type since it may be buggy
# XXX add a config option to tell if we should consider it
# or not?
#if entity.e_schema.has_metadata(attr, 'format'):
# key = '%s_format' % attr
# formparams[key] = value[1]
# self.relations.append('X %s_format %%(%s)s'
# % (attr, key))
# XXX suppose a File compatible schema
if entity.e_schema.has_subject_relation('name') \
and not formparams.get('name'):
formparams['name'] = value[0]
self.relations.append('X name %(name)s')
value = val
elif value is not None:
if attrtype in ('Date', 'Datetime', 'Time'):
try:
value = self.parse_datetime(value, attrtype)
except ValueError:
raise ValidationError(entity.eid,
{attr: self.req._("invalid date")})
elif attrtype == 'Password':
# check confirmation (see PasswordWidget for confirmation field name)
confirmval = formparams.get(attr + '-confirm')
if confirmval != value:
raise ValidationError(entity.eid,
{attr: self.req._("password and confirmation don't match")})
# password should *always* be utf8 encoded
value = value.encode('UTF8')
else:
# strip strings
value = value.strip()
elif attrtype == 'Password':
# skip None password
return # unset password
formparams[attr] = value
self.relations.append('X %s %%(%s)s' % (attr, attr))
def _relation_values(self, rschema, formparams, x, entity, late=False):
"""handle edition for the (rschema, x) relation of the given entity
"""
rtype = rschema.type
editkey = 'edit%s-%s' % (x[0], rtype)
if not editkey in formparams:
return # not edited
try:
values = self._linked_eids(self.req.list_form_param(rtype, formparams), late)
except ToDoLater:
self._pending_relations.append((rschema, formparams, x, entity))
return
origvalues = set(typed_eid(eid) for eid in self.req.list_form_param(editkey, formparams))
return values, origvalues
def handle_inlined_relation(self, rschema, formparams, entity, late=False):
"""handle edition for the (rschema, x) relation of the given entity
"""
try:
values, origvalues = self._relation_values(rschema, formparams,
'subject', entity, late)
except TypeError:
return # not edited / to do later
if values == origvalues:
return # not modified
attr = str(rschema)
if values:
formparams[attr] = iter(values).next()
self.relations.append('X %s %s' % (attr, attr.upper()))
self.restrictions.append('%s eid %%(%s)s' % (attr.upper(), attr))
elif entity.has_eid():
self.handle_relation(rschema, formparams, 'subject', entity, late)
def handle_relation(self, rschema, formparams, x, entity, late=False):
"""handle edition for the (rschema, x) relation of the given entity
"""
try:
values, origvalues = self._relation_values(rschema, formparams, x,
entity, late)
except TypeError:
return # not edited / to do later
etype = entity.e_schema
if values == origvalues:
return # not modified
if x == 'subject':
desttype = rschema.objects(etype)[0]
card = rschema.rproperty(etype, desttype, 'cardinality')[0]
subjvar, objvar = 'X', 'Y'
else:
desttype = rschema.subjects(etype)[0]
card = rschema.rproperty(desttype, etype, 'cardinality')[1]
subjvar, objvar = 'Y', 'X'
eid = entity.eid
if x == 'object' or not rschema.inlined or not values:
# this is not an inlined relation or no values specified,
# explicty remove relations
for reid in origvalues.difference(values):
rql = 'DELETE %s %s %s WHERE X eid %%(x)s, Y eid %%(y)s' % (
subjvar, rschema, objvar)
self.req.execute(rql, {'x': eid, 'y': reid}, ('x', 'y'))
rql = 'SET %s %s %s WHERE X eid %%(x)s, Y eid %%(y)s' % (
subjvar, rschema, objvar)
for reid in values.difference(origvalues):
self.req.execute(rql, {'x': eid, 'y': reid}, ('x', 'y'))
def _get_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._to_create[eid]
except KeyError:
self._to_create[eid] = None
return None
def _linked_eids(self, eids, late=False):
"""return a list of eids if they are all known, else raise ToDoLater
"""
result = set()
for eid in eids:
if not eid: # AutoCompletionWidget
continue
eid = self._get_eid(eid)
if eid is None:
if not late:
raise ToDoLater()
# eid is still None while it's already a late call
# this mean that the associated entity has not been created
raise Exception('duh')
result.add(eid)
return result