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                ## 關系模型 來自模型的記錄可能與另一個模型的記錄有關。例如,一個銷售訂單記錄與包含客戶數據的客戶記錄有關,也與它的銷售訂單行記錄有關。 練習 創建會話模型 對于模塊公開學院,我們認為一個模型 *sessions*: 一個課程是一個課程的出現,在一個給定的時間,為一個給定的觀眾講授。 創建一個模型 *sessions*. 一個會話有一個名字,一個開始日期,一個時間和一個座位的數目。添加一個動作和一個菜單項來顯示它們。通過菜單項使新的模型可見。 1. 創建類 *Session* 在 `openacademy/models.py`. 2. 在會話對象中添加訪問 `openacademy/view/openacademy.xml`. *openacademy/models.py* ~~~ python name = fields.Char(string="Title", required=True) description = fields.Text() class Session(models.Model): _name = 'openacademy.session' name = fields.Char(required=True) start_date = fields.Date() duration = fields.Float(digits=(6, 2), help="Duration in days") seats = fields.Integer(string="Number of seats") ~~~ *openacademy/views/openacademy.xml* ~~~ xml <!-- Full id location: action="openacademy.course_list_action" It is not required when it is the same module --> <!-- session form view --> <record model="ir.ui.view" id="session_form_view"> <field name="name">session.form</field> <field name="model">openacademy.session</field> <field name="arch" type="xml"> <form string="Session Form"> <sheet> <group> <field name="name"/> <field name="start_date"/> <field name="duration"/> <field name="seats"/> </group> </sheet> </form> </field> </record> <record model="ir.actions.act_window" id="session_list_action"> <field name="name">Sessions</field> <field name="res_model">openacademy.session</field> <field name="view_type">form</field> <field name="view_mode">tree,form</field> </record> <menuitem id="session_menu" name="Sessions" parent="openacademy_menu" action="session_list_action"/> </data> </openerp> ~~~ Note `digits=(6, 2)` 指定浮點數的精度:6是數字的總數,而2是逗號之后的數字。請注意,它導致在逗號之前的數字位數最多為4
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