Question

With our team, we would like to implement a feature where the user is warned whenever the record he/she is updating have also been updated by one of his collegue since he/she opened the record.

We dug into the source code because we did not find any official documentation, only some module that did not fit our Odoo version (11).

We found in the file /odoo/odoo/models.py the method def _check_concurrency(self): with the following code:

    @api.multi
    def _check_concurrency(self):
        if not (self._log_access and self._context.get(self.CONCURRENCY_CHECK_FIELD)):
            return
        check_clause = "(id = %s AND %s < COALESCE(write_date, create_date, (now() at time zone 'UTC'))::timestamp)"
        for sub_ids in self._cr.split_for_in_conditions(self.ids):
            nclauses = 0
            params = []
            for id in sub_ids:
                id_ref = "%s,%s" % (self._name, id)
                update_date = self._context[self.CONCURRENCY_CHECK_FIELD].pop(id_ref, None)
                if update_date:
                    nclauses += 1
                    params.extend([id, update_date])
            if not nclauses:
                continue
            query = "SELECT id FROM %s WHERE %s" % (self._table, " OR ".join([check_clause] * nclauses))
            self._cr.execute(query, tuple(params))
            res = self._cr.fetchone()
            if res:
                # mention the first one only to keep the error message readable
                raise ValidationError(_('A document was modified since you last viewed it (%s:%d)') % (self._description, res[0]))

=> This method is called before any "write". It compares :

the __last_update value of the record at the time of write
with a value of __last_update get from the context, which therefore should have been set in the context beforehand

PROBLEM

We did not find anywhere in the code (python or javascript) the value set in the context => NOTHING HAPPENS ! THe function returns from the beginning.

When we tried to hardcode it in the context, the function check_concurrency seems to work properly.

QUESTION

Does anyone one know where the __last_update is set or SHOULD BE set in the context ? And how ? I would e.g. imagine setting it somehow when clicking on edit button of a record ??? Or at read time ??

Answer 1

CONCURRENCY_CHECK_FIELD = '__last_update'

并发字段是一个动态字段，其动态定义的计算方法也可以看到这是由更新 last_modified_name = 'compute_concurrency_field_with_access'或last_modified_name = 'compute_concurrency_field'根据访问权限，稍后添加到课程中。以下功能将参与解决方法。

@api.model
    def _add_magic_fields(self):
        """ Introduce magic fields on the current class

        * id is a "normal" field (with a specific getter)
        * create_uid, create_date, write_uid and write_date have become
          "normal" fields
        * $CONCURRENCY_CHECK_FIELD is a computed field with its computing
          method defined dynamically. Uses ``str(datetime.datetime.utcnow())``
          to get the same structure as the previous
          ``(now() at time zone 'UTC')::timestamp``::

              # select (now() at time zone 'UTC')::timestamp;
                        timezone
              ----------------------------
               2013-06-18 08:30:37.292809

              >>> str(datetime.datetime.utcnow())
              '2013-06-18 08:31:32.821177'
        """
        def add(name, field):
            """ add ``field`` with the given ``name`` if it does not exist yet """
            if name not in self._fields:
                self._add_field(name, field)

        # cyclic import
        from . import fields

        # this field 'id' must override any other column or field
        self._add_field('id', fields.Id(automatic=True))

        add('display_name', fields.Char(string='Display Name', automatic=True,
            compute='_compute_display_name'))

        if self._log_access:
            add('create_uid', fields.Many2one('res.users', string='Created by', automatic=True))
            add('create_date', fields.Datetime(string='Created on', automatic=True))
            add('write_uid', fields.Many2one('res.users', string='Last Updated by', automatic=True))
            add('write_date', fields.Datetime(string='Last Updated on', automatic=True))
            last_modified_name = 'compute_concurrency_field_with_access'
        else:
            last_modified_name = 'compute_concurrency_field'

        # this field must override any other column or field
        self._add_field(self.CONCURRENCY_CHECK_FIELD, fields.Datetime(
            string='Last Modified on', compute=last_modified_name, automatic=True))

    def compute_concurrency_field(self):
        for record in self:
            record[self.CONCURRENCY_CHECK_FIELD] = odoo.fields.Datetime.now()

    @api.depends('create_date', 'write_date')
    def compute_concurrency_field_with_access(self):
        for record in self:
            record[self.CONCURRENCY_CHECK_FIELD] = \
                record.write_date or record.create_date or odoo.fields.Datetime.now()

Odoo _check_concurrency never triggered?

1 个答案: