# mrp_abstract_workorder.py ```python=3.8 class MrpAbstractWorkorder(models.AbstractModel): ``` > ### models.AbstractModel AbstractModel 方便讓model可重複使用 > To create a model without any table, inherit from AbstractModel. > Abstract models allow us to just create a generic model that implements some feature that can then be inherited by regular models in order to make that feature available in them. ```python=. _name = "mrp.abstract.workorder" ``` > ```_name``` is required and **defines the name for the model** in the Odoo system. > ```.``` is automatically converted into a ```_``` ```python=. _description = "Common code between produce wizards and workorders." ``` > Information of models ```python=. _check_company_auto = True ``` > 有多公司的業務需處理時， > >http://120.79.186.14/index.php/2021/06/01/odoo_multi_company/ ```python=. production_id = fields.Many2one('mrp.production', 'Manufacturing Order', required=True, check_company=True) ``` > ```'mrp.production'``` is the target model which want to relate with. > ```'Manufacturing Order'``` is the name of this variable. > ```required=True``` is mena that the filed should be code. > ```check_company=True```