需要继承BaseModel类并添加一个新属性，例如
_auto = True
_register = False
_name = None
_columns = {}
_constraints = []
_custom = False
_defaults = {}
_rec_name = None
_parent_name = 'parent_id'
_parent_store = False
_parent_order = False
_date_name = 'date'
_order = 'id'
_sequence = None
_description = None
_needaction = False
_translate = True
在所有模型中使用此属性，因此需要声明为全局
例子 ：
from openerp import api, fields, models, _
class NewClass(models.Model):
_name = 'object name'
_new_attribute = 'vaule'
from openerp import api, fields, models, _
class BaseModelExtend(models.AbstractModel):
_name = 'basemodel.extend'
models.BaseModel._navigation = 'id'
def _register_hook(self, cr):
'''
Register method in BaseModel
'''
@api.multi
def navigate_field(self):
#CODE
return True
models.BaseModel.navigate_field = navigate_field
return super(BaseModelExtend, self)._register_hook(cr)
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