Many2many 向前引用问题

[digitalsatori]

能否贴一下代码，一起研究下

[oldrev]

[code]# 驾驶员信息
class driver(osv.osv):
_name = "transit.driver"
_description = "驾驶员信息"
_inherits = {'hr.employee': 'name'}
_columns = {
'name': fields.many2one ('hr.employee','姓名', domain=[('is_driver', '=', "1")], required=True, help="驾驶员的姓名"),
'active': fields.boolean('有效'),
'code': fields.char ('驾照', size=128, help="驾驶证编号"),
'license': fields.char ('准驾证', size=128, help="准驾证编号"),
'vehicle_ids': fields.many2many ('transit.vehicle', 'transit_vehicles_drivers_rel','driver_id','vehicle_id', '相关车辆'), #应该就是这里引起的
'notes': fields.text ('备注'),
}
_defaults = {
'active': lambda *a: True,
}
_sql_constraints = [
('code_key', 'UNIQUE (code)', '驾照不能重复！'),
('license_key', 'UNIQUE (license)', '准驾证不能重复！')
]
driver()

class vehicle(osv.osv):
_name = 'transit.vehicle'
_description = '车辆档案'

def _get_models(self, cr, uid, context={}):
    return common.get_objects_for_selection(self, cr, uid, 'transit.vehicle.model', context) 


_columns = {
    'name': fields.char('编号', size=50, required=True, help='公司或车队内部的自编号'),
    'active': fields.boolean('有效'),
    'license': fields.char('牌照', size=50, required=True),
    'passenger_capacity': fields.integer('乘员数'),
    'transit_capacity': fields.float('载重量（顿）'),
    'description': fields.text('说明'),
    'category_id': fields.many2one('transit.vehicle.category', '分类', required=True),
    'model': fields.selection(_get_models, "车型"),
    'driver_ids': fields.many2many ('transit.driver', 'transit_vehicles_drivers_rel','vehicle_id','driver_id', '驾驶员'),
    'ein': fields.char('发动机号', size=128, required=False),
    'insurance': fields.char('保险号', size=128, required=False),
    'frame_number': fields.char('车架号', size=128, required=False),
    'chassis_number': fields.char('底盘号', size=128, required=False),
    'depreciation': fields.float('月折旧', 
        digits=(16, int(config['price_accuracy'])), help='车辆月折旧费用的估计值'),
    'oil_consumption': fields.float('百公里油耗', help='车辆百公里耗油量的估计值'),
    'state': fields.selection([
        ('ready','待命'),
        ('transporting','运输途中'),
        ('maintaining','正在维护'),
        ('scrapped','报废'), ], '车辆状态', readonly=True, help='该车辆在系统中的状态', select=True),
}

_defaults = {
    'active':   lambda *a: True,
}
_sql_constraints = [
    ('license_key', 'UNIQUE (license)', '车辆牌照不能重复！')
]

vehicle()[/code]

[mrshelly]

看起来好象没有什么问题呀...

[oldrev]

我在安装模块的时候提示无法找到关系“transit_vehicle”

[oldrev]

详细错误信息：[code]
Traceback (most recent call last):
File "D:devopenerpstableserverbinnetsvc.py", line 235, in dispatch
result = LocalService(service_name)(method, *params)
File "D:devopenerpstableserverbinnetsvc.py", line 74, in call
return getattr(self, method)(*params)
File "D:devopenerpstableserverbinserviceweb_services.py", line 582, in execute
return self.execute(db, uid, wiz_id, datas, action, context)
File "D:devopenerpstableserverbinserviceweb_services.py", line 562, in execute
return wiz.execute(db, uid, self.wiz_datas[wiz_id], action, context)
File "D:devopenerpstableserverbinwizard__init.py", line 178, in execute
res = self.execute_cr(cr, uid, data, state, context)
File "D:devopenerpstableserverbinwizard__init__.py", line 74, in execute_cr
action_res = action(self, cr, uid, data, context)
File "D:devopenerpstableserverbinaddonsbasemodulewizardwizard_module_upgrade.py", line 92, in upgrade_module
db, pool = pooler.restart_pool(cr.dbname, update_module=True)
File "D:devopenerpstableserverbinpooler.py", line 62, in restart_pool
return get_db_and_pool(db_name, force_demo, status, update_module=update_module)
File "D:devopenerpstableserverbinpooler.py", line 40, in get_db_and_pool
addons.load_modules(db, force_demo, status, update_module)
File "D:devopenerpstableserverbinaddons__init_.py", line 718, in load_modules
r = load_module_graph(cr, graph, status, report=report)
File "D:devopenerpstableserverbinaddons__init__.py", line 581, in load_module_graph
init_module_objects(cr, package.name, modules)
File "D:devopenerpstableserverbinaddons__init__.py", line 366, in init_module_objects
result = obj._auto_init(cr, {'module': module_name})
File "D:devopenerpstableserverbinosvorm.py", line 1532, in _auto_init
cr.execute('CREATE TABLE "%s" ("%s" INTEGER NOT NULL REFERENCES "%s" ON DELETE CASCADE, "%s" INTEGER NOT NULL REFERENCES "%s" ON DELETE CASCADE) WITH OIDS' % (f._rel, f._id1, self._table, f._id2, ref))
File "D:devopenerpstableserverbinsql_db.py", line 76, in wrapper
return f(self, *args, **kwargs)
File "D:devopenerpstableserverbinsql_db.py", line 120, in execute
res = self._obj.execute(query, params)
ProgrammingError: relation "transit_vehicle" does not exist

[/code]

[digitalsatori]

这个错误应该是因为transit.vehicle对象还没有被初始化就被调用了。把vehicle类放到driver类之前试试？

另外，_inherits在这里用来表示一对一关系的，可是name,active字段与父类重复，应该也会有问题的。

[oldrev]

两个具有 many2many 的对象，谁放到前面建表的时候就会提示找不到另一个对象

[digitalsatori]

哦，想简单了。
假设driver类在前，vehicle类在后。 在driver类中先不声明对vehicle的many2many引用，而在vehicle类之后再创建对driver的继承类并添加many2many field. 看看这样是不是可以？

[oldrev]

这样应该是可以的，可问题是内置的 res.users 和 res.roles 就可以直接用 many2many 互相引用，我的就不行

[digitalsatori]

res.user和res.roles对应的表是在服务器初始化的时候由base.sql 创建好的，所以没有初始化的先后关系的问题。

[oldrev]

那只有按你说的了：
先把两个不包含 many2many 属性的对象定义放在前面，然后又用单表继承的方法加入 many2many 属性

唯一的问题是这样太不直观了，难道 Tiny 的人没有想过这个问题？就不能先把表都建好再加上约束？

[[i] 本帖最后由 oldrev 于 2009-6-7 22:33 编辑 [/i]]

[digitalsatori]

oldrev, 你的代码现在调试通过了吗？我想跟踪一下，我也在官方论坛里问一下有没有更好的办法。

[oldrev]

调试通过了