添加到 Many2many 字段的用户在单击保存后消失

Question

我尝试将用户添加到 many2many 字段。在单击保存之前，它正在工作。 当我点击保存时它消失了。但是如果我在添加一些额外的元素之前做这个字段，其他元素在点击保存后会保留。

代码：

@api.multi
@api.onchange('partner_id')
def find_projects(self):
    mail_followers = self.env["mail.followers"]
    projects_follower_id = mail_followers.search([('partner_id', '=', self.partner_id.id), ('res_model', '=', 'project.project')])
    projects_list = []
    for x in range(len(projects_follower_id)):
        project_id = self.env["project.project"].search([('id', '=', projects_follower_id[x].res_id), ('active', '=', True)])
        if project_id and project_id not in projects_list:
            projects_list.append(project_id.id)

    self.debug_projects = len(projects_follower_id)
    self.debug_projects2 = projects_follower_id
    self.debug_projects3 = projects_list
    self.project_ids = [[6, 0, projects_list]]

屏幕：

点击保存前的一个元素：

点击保存后：

在点击保存之前手动添加额外元素：

点击保存后手动添加一个元素：

Answer 1

问题是这个错误：

https://github.com/odoo/odoo/issues/14761

在默认视图中它不起作用，当我在视图中添加widget="many2many_tags" 时它开始工作。

Answer 2

在onchange中，当你想更新many2many的值时不要使用command list，使用RecordSet，我会稍微简化你的代码：

# don't use api.multi because it's by default multi with onchange, constraints, depends
@api.onchange('partner_id')
def find_projects(self):
    # extract followers <RecordsSet>
    projects_followers = self.env["mail.followers"].search([('partner_id', '=', self.partner_id.id), ('res_model', '=', 'project.project')])
    # extract all project ids without duplication <list of int >
    project_ids = projects_followers.mapped('res_id')
    # no need to pass active = True Odoo by default add it
    # search for porject <RecordSet>
    projects = self.env["project.project"]search([('id', 'in', project_ids)])
    # for debuging
    self.debug_projects = len(projects_followers)
    self.debug_projects2 = projects_followers
    self.debug_projects3 = project_ids

    # don't use any command by default Odoo detect witch project still in the field
    # and witch one are added when you inspect write you will find that new ones are added 
    # by (4, id)  the ones that were removed are (3, id)
    self.project_ids = projects

编辑：

当我调查传递给 create 和 write 的字典值时，Odoo 正在将命令转换为仅update 命令，在我通过 ID 为 1,2 的 onchange 事件记录添加之后，字典中的命令是这样的！！：

      'my_many2may' : [[1, 1, {u'name': u'1'}], [1, 2, {u'name': u'2'}]]

在新版本的 Odoo (> 11.0) 中，many2many 传递的命令是替换命令：[(6, 0, ids)] (bug was fixed)：

要在您的情况下解决此问题，只需覆盖 create aand write 以修复您的字段的逗号：

def _fix_vals(self, vals):
    """ fix bug of ignored record added by onchange event."""
    commands = vals.get('project_ids', [])
    if commands and not any(command[0] == 6 for command in commands):
        vals['project_ids'] +=  [(4, command[1]) for command in commands if command[0] == 1]


@api.model
def create(self, vals):
    self._fix_vals(vals)
    return super(YourClassName, self).create(vals)


@api.multi
def write(self, vals):
    self._fix_vals(vals)
    return super(YourClassName, self).write(vals)

所以基本上当我像这样修复commands时：

    [[1, 1, {u'name': u'1'}], [1, 2, {u'name': u'2'}]]
    # to this
    [(4,1), (4,2), [1, 1, {u'name': u'1'}], [1, 2, {u'name': u'2'}]]

注意：我注意到，当您手动添加记录时，通过了命令 (6,0, ids) 不会出现问题，这就是为什么我在修复它们之前检查了该命令是否存在