diff --git a/base_dav/__manifest__.py b/base_dav/__manifest__.py
index 5c714e454..3bd76b108 100644
--- a/base_dav/__manifest__.py
+++ b/base_dav/__manifest__.py
@@ -3,7 +3,7 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
 {
     "name": "Caldav and Carddav support",
-    "version": "12.0.1.0.0",
+    "version": "14.0.1.0.0",
     "author": "initOS GmbH,Therp BV,Odoo Community Association (OCA)",
     "license": "AGPL-3",
     "category": "Extra Tools",
diff --git a/base_dav/models/dav_collection.py b/base_dav/models/dav_collection.py
index 62d530f7d..5a6ad83a9 100644
--- a/base_dav/models/dav_collection.py
+++ b/base_dav/models/dav_collection.py
@@ -7,6 +7,7 @@ from operator import itemgetter
 from urllib.parse import quote_plus
 
 from odoo import api, fields, models, tools
+from odoo.tools.safe_eval import safe_eval
 import logging
 
 import vobject
@@ -19,8 +20,8 @@ logger = logging.getLogger(__name__)
 
 
 class DavCollection(models.Model):
-    _name = 'dav.collection'
-    _description = 'A collection accessible via WebDAV'
+    _name = "dav.collection"
+    _description = "A collection accessible via WebDAV"
 
     name = fields.Char(required=True)
     rights = fields.Selection(
@@ -34,99 +35,94 @@ class DavCollection(models.Model):
     )
     dav_type = fields.Selection(
         [
-            ('calendar', 'Calendar'),
-            ('addressbook', 'Addressbook'),
-            ('files', 'Files'),
+            ("calendar", "Calendar"),
+            ("addressbook", "Addressbook"),
+            ("files", "Files"),
         ],
-        string='Type',
+        string="Type",
         required=True,
-        default='calendar',
+        default="calendar",
     )
-    tag = fields.Char(compute='_compute_tag')
+    tag = fields.Char(compute="_compute_tag")
     model_id = fields.Many2one(
-        'ir.model',
-        string='Model',
+        "ir.model",
+        string="Model",
         required=True,
-        domain=[('transient', '=', False)],
+        ondelete="cascade",
+        domain=[("transient", "=", False)],
     )
     domain = fields.Char(
         required=True,
-        default='[]',
+        default="[]",
     )
-    field_uuid = fields.Many2one('ir.model.fields')
+    field_uuid = fields.Many2one("ir.model.fields")
     field_mapping_ids = fields.One2many(
-        'dav.collection.field_mapping',
-        'collection_id',
-        string='Field mappings',
+        "dav.collection.field_mapping",
+        "collection_id",
+        string="Field mappings",
     )
-    url = fields.Char(compute='_compute_url')
+    url = fields.Char(compute="_compute_url")
 
-    @api.multi
     def _compute_tag(self):
         for this in self:
-            if this.dav_type == 'calendar':
-                this.tag = 'VCALENDAR'
-            elif this.dav_type == 'addressbook':
-                this.tag = 'VADDRESSBOOK'
+            if this.dav_type == "calendar":
+                this.tag = "VCALENDAR"
+            elif this.dav_type == "addressbook":
+                this.tag = "VADDRESSBOOK"
 
-    @api.multi
     def _compute_url(self):
-        base_url = self.env['ir.config_parameter'].get_param('web.base.url')
+        base_url = self.env["ir.config_parameter"].get_param("web.base.url")
         for this in self:
-            this.url = '%s%s/%s/%s' % (
+            this.url = "%s%s/%s/%s" % (
                 base_url,
                 PREFIX,
                 self.env.user.login,
                 this.id,
             )
 
-    @api.constrains('domain')
+    @api.constrains("domain")
     def _check_domain(self):
         self._eval_domain()
 
     @api.model
     def _eval_context(self):
         return {
-            'user': self.env.user,
+            "user": self.env.user,
         }
 
     @api.model
     def get_logger(self):
         return logger
 
-    @api.multi
     def _eval_domain(self):
         self.ensure_one()
-        return list(tools.safe_eval(self.domain, self._eval_context()))
+        return list(safe_eval(self.domain, self._eval_context()))
 
-    @api.multi
     def eval(self):
         if not self:
-            return self.env['unknown']
+            return self.env["unknown"]
         self.ensure_one()
         return self.env[self.model_id.model].search(self._eval_domain())
 
-    @api.multi
     def get_record(self, components):
         self.ensure_one()
         collection_model = self.env[self.model_id.model]
 
         field_name = self.field_uuid.name or "id"
-        domain = [(field_name, '=', components[-1])] + self._eval_domain()
+        domain = [(field_name, "=", components[-1])] + self._eval_domain()
         return collection_model.search(domain, limit=1)
 
-    @api.multi
     def from_vobject(self, item):
         self.ensure_one()
 
         result = {}
-        if self.dav_type == 'calendar':
-            if item.name != 'VCALENDAR':
+        if self.dav_type == "calendar":
+            if item.name != "VCALENDAR":
                 return None
-            if not hasattr(item, 'vevent'):
+            if not hasattr(item, "vevent"):
                 return None
             item = item.vevent
-        elif self.dav_type == 'addressbook' and item.name != 'VCARD':
+        elif self.dav_type == "addressbook" and item.name != "VCARD":
             return None
 
         children = {c.name.lower(): c for c in item.getChildren()}
@@ -142,15 +138,14 @@ class DavCollection(models.Model):
 
         return result
 
-    @api.multi
     def to_vobject(self, record):
         self.ensure_one()
         result = None
         vobj = None
-        if self.dav_type == 'calendar':
+        if self.dav_type == "calendar":
             result = vobject.iCalendar()
-            vobj = result.add('vevent')
-        if self.dav_type == 'addressbook':
+            vobj = result.add("vevent")
+        if self.dav_type == "addressbook":
             result = vobject.vCard()
             vobj = result
         for mapping in self.field_mapping_ids:
@@ -158,50 +153,49 @@ class DavCollection(models.Model):
             if value:
                 vobj.add(mapping.name).value = value
 
-        if 'uid' not in vobj.contents:
-            vobj.add('uid').value = '%s,%s' % (record._name, record.id)
-        if 'rev' not in vobj.contents and 'write_date' in record._fields:
-            vobj.add('rev').value = record.write_date.strftime('%Y-%m-%dT%H%M%SZ')
+        if "uid" not in vobj.contents:
+            vobj.add("uid").value = "%s,%s" % (record._name, record.id)
+        if "rev" not in vobj.contents and "write_date" in record._fields:
+            vobj.add("rev").value = record.write_date.strftime("%Y-%m-%dT%H%M%SZ")
         return result
 
     @api.model
     def _odoo_to_http_datetime(self, value):
-        return value.strftime('%a, %d %b %Y %H:%M:%S GMT')
+        return value.strftime("%a, %d %b %Y %H:%M:%S GMT")
 
     @api.model
     def _split_path(self, path):
-        return list(filter(
-            None, os.path.normpath(path or '').strip('/').split('/')
-        ))
+        return list(filter(None, os.path.normpath(path or "").strip("/").split("/")))
 
-    @api.multi
     def dav_list(self, collection, path_components):
         self.ensure_one()
 
-        if self.dav_type == 'files':
+        if self.dav_type == "files":
             if len(path_components) == 3:
                 collection_model = self.env[self.model_id.model]
-                record = collection_model.browse(map(
-                    itemgetter(0),
-                    collection_model.name_search(
-                        path_components[2], operator='=', limit=1,
+                record = collection_model.browse(
+                    map(
+                        itemgetter(0),
+                        collection_model.name_search(
+                            path_components[2],
+                            operator="=",
+                            limit=1,
+                        ),
                     )
-                ))
+                )
                 return [
-                    '/' + '/'.join(
-                        path_components + [quote_plus(attachment.name)]
+                    "/" + "/".join(path_components + [quote_plus(attachment.name)])
+                    for attachment in self.env["ir.attachment"].search(
+                        [
+                            ("type", "=", "binary"),
+                            ("res_model", "=", record._name),
+                            ("res_id", "=", record.id),
+                        ]
                     )
-                    for attachment in self.env['ir.attachment'].search([
-                        ('type', '=', 'binary'),
-                        ('res_model', '=', record._name),
-                        ('res_id', '=', record.id),
-                    ])
                 ]
             elif len(path_components) == 2:
                 return [
-                    '/' + '/'.join(
-                        path_components + [quote_plus(record.display_name)]
-                    )
+                    "/" + "/".join(path_components + [quote_plus(record.display_name)])
                     for record in self.eval()
                 ]
 
@@ -214,11 +208,16 @@ class DavCollection(models.Model):
                 uuid = record[self.field_uuid.name]
             else:
                 uuid = str(record.id)
-            href = '/' + '/'.join(path_components + [uuid])
+            try:
+                href = "/" + "/".join(path_components + [str(uuid)])
+            except:
+                import ipdb
+
+                ipdb.set_trace()
+
             result.append(self.dav_get(collection, href))
         return result
 
-    @api.multi
     def dav_delete(self, collection, components):
         self.ensure_one()
 
@@ -228,13 +227,12 @@ class DavCollection(models.Model):
         else:
             self.get_record(components).unlink()
 
-    @api.multi
     def dav_upload(self, collection, href, item):
         self.ensure_one()
 
         components = self._split_path(href)
         collection_model = self.env[self.model_id.model]
-        if self.dav_type == 'files':
+        if self.dav_type == "files":
             # TODO: Handle upload of attachments
             return None
         data = self.from_vobject(item)
@@ -257,37 +255,41 @@ class DavCollection(models.Model):
             last_modified=self._odoo_to_http_datetime(record.write_date),
         )
 
-    @api.multi
     def dav_get(self, collection, href):
         self.ensure_one()
 
         components = self._split_path(href)
         collection_model = self.env[self.model_id.model]
-        if self.dav_type == 'files':
+        if self.dav_type == "files":
             if len(components) == 3:
                 result = Collection(href)
                 result.logger = self.logger
                 return result
             if len(components) == 4:
-                record = collection_model.browse(map(
-                    itemgetter(0),
-                    collection_model.name_search(
-                        components[2], operator='=', limit=1,
+                record = collection_model.browse(
+                    map(
+                        itemgetter(0),
+                        collection_model.name_search(
+                            components[2],
+                            operator="=",
+                            limit=1,
+                        ),
                     )
-                ))
-                attachment = self.env['ir.attachment'].search([
-                    ('type', '=', 'binary'),
-                    ('res_model', '=', record._name),
-                    ('res_id', '=', record.id),
-                    ('name', '=', components[3]),
-                ], limit=1)
+                )
+                attachment = self.env["ir.attachment"].search(
+                    [
+                        ("type", "=", "binary"),
+                        ("res_model", "=", record._name),
+                        ("res_id", "=", record.id),
+                        ("name", "=", components[3]),
+                    ],
+                    limit=1,
+                )
                 return FileItem(
                     collection,
                     item=attachment,
                     href=href,
-                    last_modified=self._odoo_to_http_datetime(
-                        record.write_date
-                    ),
+                    last_modified=self._odoo_to_http_datetime(record.write_date),
                 )
 
         record = self.get_record(components)
diff --git a/base_dav/models/dav_collection_field_mapping.py b/base_dav/models/dav_collection_field_mapping.py
index f516f5ed0..fd92b5b87 100644
--- a/base_dav/models/dav_collection_field_mapping.py
+++ b/base_dav/models/dav_collection_field_mapping.py
@@ -13,11 +13,13 @@ from dateutil import tz
 
 
 class DavCollectionFieldMapping(models.Model):
-    _name = 'dav.collection.field_mapping'
-    _description = 'A field mapping for a WebDAV collection'
+    _name = "dav.collection.field_mapping"
+    _description = "A field mapping for a WebDAV collection"
 
     collection_id = fields.Many2one(
-        'dav.collection', required=True, ondelete='cascade',
+        "dav.collection",
+        required=True,
+        ondelete="cascade",
     )
     name = fields.Char(
         required=True,
@@ -25,59 +27,57 @@ class DavCollectionFieldMapping(models.Model):
     )
     mapping_type = fields.Selection(
         [
-            ('simple', 'Simple'),
-            ('code', 'Code'),
+            ("simple", "Simple"),
+            ("code", "Code"),
         ],
-        default='simple',
+        default="simple",
         required=True,
     )
     field_id = fields.Many2one(
-        'ir.model.fields',
+        "ir.model.fields",
         required=True,
+        ondelete="cascade",
         help="Field of the model the values are mapped to",
     )
     model_id = fields.Many2one(
-        'ir.model',
-        related='collection_id.model_id',
+        "ir.model",
+        related="collection_id.model_id",
     )
     import_code = fields.Text(
         help="Code to import the value from a vobject. Use the variable "
-             "result for the output of the value and item as input"
+        "result for the output of the value and item as input"
     )
     export_code = fields.Text(
         help="Code to export the value to a vobject. Use the variable "
-             "result for the output of the value and record as input"
+        "result for the output of the value and record as input"
     )
 
-    @api.multi
     def from_vobject(self, child):
         self.ensure_one()
-        if self.mapping_type == 'code':
+        if self.mapping_type == "code":
             return self._from_vobject_code(child)
         return self._from_vobject_simple(child)
 
-    @api.multi
     def _from_vobject_code(self, child):
         self.ensure_one()
         context = {
-            'datetime': datetime,
-            'dateutil': dateutil,
-            'item': child,
-            'result': None,
-            'tools': tools,
-            'tz': tz,
-            'vobject': vobject,
+            "datetime": datetime,
+            "dateutil": dateutil,
+            "item": child,
+            "result": None,
+            "tools": tools,
+            "tz": tz,
+            "vobject": vobject,
         }
         safe_eval(self.import_code, context, mode="exec", nocopy=True)
-        return context.get('result', {})
+        return context.get("result", {})
 
-    @api.multi
     def _from_vobject_simple(self, child):
         self.ensure_one()
         name = self.name.lower()
         conversion_funcs = [
-            '_from_vobject_%s_%s' % (self.field_id.ttype, name),
-            '_from_vobject_%s' % self.field_id.ttype,
+            "_from_vobject_%s_%s" % (self.field_id.ttype, name),
+            "_from_vobject_%s" % self.field_id.ttype,
         ]
 
         for conversion_func in conversion_funcs:
@@ -108,16 +108,15 @@ class DavCollectionFieldMapping(models.Model):
 
     @api.model
     def _from_vobject_binary(self, item):
-        return item.value.encode('ascii')
+        return item.value.encode("ascii")
 
     @api.model
     def _from_vobject_char_n(self, item):
         return item.family
 
-    @api.multi
     def to_vobject(self, record):
         self.ensure_one()
-        if self.mapping_type == 'code':
+        if self.mapping_type == "code":
             result = self._to_vobject_code(record)
         else:
             result = self._to_vobject_simple(record)
@@ -126,29 +125,25 @@ class DavCollectionFieldMapping(models.Model):
             return result.replace(tzinfo=tz.UTC)
         return result
 
-    @api.multi
     def _to_vobject_code(self, record):
         self.ensure_one()
         context = {
-            'datetime': datetime,
-            'dateutil': dateutil,
-            'record': record,
-            'result': None,
-            'tools': tools,
-            'tz': tz,
-            'vobject': vobject,
+            "datetime": datetime,
+            "dateutil": dateutil,
+            "record": record,
+            "result": None,
+            "tools": tools,
+            "tz": tz,
+            "vobject": vobject,
         }
-        safe_eval(self.export_code, context,  mode="exec", nocopy=True)
-        return context.get('result', None)
+        safe_eval(self.export_code, context, mode="exec", nocopy=True)
+        return context.get("result", None)
 
-    @api.multi
     def _to_vobject_simple(self, record):
         self.ensure_one()
         conversion_funcs = [
-            '_to_vobject_%s_%s' % (
-                self.field_id.ttype, self.name.lower()
-            ),
-            '_to_vobject_%s' % self.field_id.ttype,
+            "_to_vobject_%s_%s" % (self.field_id.ttype, self.name.lower()),
+            "_to_vobject_%s" % self.field_id.ttype,
         ]
         value = record[self.field_id.name]
         for conversion_func in conversion_funcs:
@@ -163,8 +158,7 @@ class DavCollectionFieldMapping(models.Model):
 
     @api.model
     def _to_vobject_datetime_rev(self, value):
-        return value and value\
-            .replace('-', '').replace(' ', 'T').replace(':', '') + 'Z'
+        return value and value.replace("-", "").replace(" ", "T").replace(":", "") + "Z"
 
     @api.model
     def _to_vobject_date(self, value):
@@ -172,7 +166,7 @@ class DavCollectionFieldMapping(models.Model):
 
     @api.model
     def _to_vobject_binary(self, value):
-        return value and value.decode('ascii')
+        return value and value.decode("ascii")
 
     @api.model
     def _to_vobject_char_n(self, value):
diff --git a/base_dav/radicale/auth.py b/base_dav/radicale/auth.py
index ba6c3b407..707a7422b 100644
--- a/base_dav/radicale/auth.py
+++ b/base_dav/radicale/auth.py
@@ -12,7 +12,7 @@ except ImportError:
 class Auth(BaseAuth):
     def login(self, user, password):
         env = request.env
-        uid = env['res.users']._login(env.cr.dbname, user, password)
+        uid = env['res.users']._login(env.cr.dbname, user, password, {})
         login = request.env['res.users'].browse(uid).login
         if uid:
             request._env = env(user=uid)
diff --git a/requirements.txt b/requirements.txt
index 66d6d61ae..f9ef27417 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1 @@
-sqlalchemy
-mysqlclient==2.0.1
-pymssql
 radicale==3.1.1