odoo 关系字段(关联关系)

 

Many-to-one关联

publisher_id = fields.Many2one(comodel_name= 'res.partner', domain='',context={},ondelete='',auto_join='',delegate='',string='Publisher')

    

many-to-one模型字段在数据表中创建一个字段,并带有指向关联表的外键,其中为关联记录的数据库 ID。以下是many-to-one字段可用的关键字参数:

  • ondelete定义关联记录删除时执行的操作:context是一个数据字典,可在浏览关联时为网页客户端传递信息,比如设置默认值。
    • set null (默认值): 关联字段删除时会置为空值
    • restricted:抛出错误阻止删除
    • cascade:在关联记录删除时同时删除当前记录
  • domain是一个域表达式:使用一个元组列表过滤记录来作为关联记录选项。
  • auto_join=True允许ORM在使用关联进行搜索时使用SQL连接。使用时会跳过访问安全规则,用户可以访问安全规则不允许其访问的关联记录,但这样 SQL 的查询会更有效率且更快。
  • delegate=True 创建一个关联记录的代理继承。使用时必须设置required=True和ondelete=’cascade’

 

One-to-many反向关联

 published_book_ids = fields.One2many(

  comodel_name= 'library.book', # related model

       inverse_name= 'publisher_id', # fields for "this" on related model
      domain='',
      context={},
     auto_join='',
     limit=0,
        string='Published Books')
 

Many-to-many关联

    author_ids = fields.Many2many(

    comodel_name='res.partner', # 关联模型(必填)
    relation='library_book_res_partner_rel', # 关联表名
    column1='a_id', # 本记录关联表字段
    column2='p_id', # 关联记录关联表字段
    string='Authors') # string标签文本
  
    

class Many2many(_RelationalMulti):
""" Many2many field; the value of such a field is the recordset.

:param comodel_name: name of the target model (string)

The attribute ``comodel_name`` is mandatory except in the case of related
fields or field extensions.

:param relation: optional name of the table that stores the relation in
the database (string)

:param column1: optional name of the column referring to "these" records
in the table ``relation`` (string)

:param column2: optional name of the column referring to "those" records
in the table ``relation`` (string)

The attributes ``relation``, ``column1`` and ``column2`` are optional. If not
given, names are automatically generated from model names, provided
``model_name`` and ``comodel_name`` are different!

:param domain: an optional domain to set on candidate values on the
client side (domain or string)

:param context: an optional context to use on the client side when
handling that field (dictionary)

:param limit: optional limit to use upon read (integer)

"""

在创建抽象模型时,many-to-many中不要使用column1和column2属性。在 ORM 设计中对抽象模型有一个限制,如果指定关联表列名,就无法再被正常继承。
 
posted @ 2019-06-13 19:05  kakaok  阅读(3569)  评论(0编辑  收藏  举报