Odoo10开发之模型关联

Odoo10开发之模型关联

模型关联

一个模型中的记录可能关联到另一个模型中的记录。例如,销售订单记录会关联到一个包含客户数据的客户记录中;同时销售订单记录也会关联到销售订单明细记录。

练习建立一个授课模型
在开放学院模块中,我们考虑一个授课模型:一个授课是在给定的时间中对给定的受众教授指定的课程。为授课建立模型,授课包括名称、开始时间、持续时间和席位数。添加操作和菜单项来显示新的模型。

· openacademy/models/models.py文件中创建Session

· openacademy/view/openacademy.xml文件中添加访问授课对象的菜单和操作

openacademy/models.py

    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

        

        

        <record model="ir.ui.view" id="session_form_view">

            <field name="name">session.formfield>

            <field name="model">openacademy.sessionfield>

            <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">Sessionsfield>

            <field name="res_model">openacademy.sessionfield>

            <field name="view_type">formfield>

            <field name="view_mode">tree,formfield>

        record>

        <menuitem id="session_menu" name="Sessions"

                  parent="openacademy_menu"

                  action="session_list_action"/>

    data>odoo>

注意
digits=(6,2)指定浮点数的精度:6是数字的总和,而2是小数位长度,这同时表明整数位的最大长度是4

关联字段

关联字段链接同一模型(不同层次结构)或者不同模型之间的记录。关联字段有三种类型:
Many2one(other_model, ondelete='set null')
一个链接到其它对象的简单示例是这样的:

print foo.other_id.name

One2many(other_model, related_field)
这是一个虚拟的关联,是Many2one的逆,One2many作为记录的容器,访问它将返回一个记录集(也可能是一个空记录集):

for other in foo.other_ids:

    print other.name

警告
因为One2many是一个虚拟关联,所以必须有一个Many2one字段存在于other_model,其名称也必须是related_field

Many2many(other_model)
双向多对多关联,一方的任一记录可以与另一方的任意数量记录关联。作为记录的容器,访问它也可能导致返回空记录集

for other in foo.other_ids:

    print other.name

练习Many2one关联
编辑CourseSession模型以反映他们与其它模型的关联:

· 课程有一个负责的用户;该字段的值是内置模型res.users的记录

· 一个授课有一个教师;该字段的值是内置模型res.partner的记录

· 授课与课程相关;该字段的值是openacademy.course模型的记录,并且是必填项

· 在模型中添加Many2one关联,并在视图显示

openacademy/models.py

    name = fields.Char(string="Title", required=True)

    description = fields.Text()

    responsible_id = fields.Many2one('res.users',

        ondelete='set null', string="Responsible", index=True)

class Session(models.Model):

    _name = 'openacademy.session'

    start_date = fields.Date()

    duration = fields.Float(digits=(6, 2), help="Duration in days")

    seats = fields.Integer(string="Number of seats")

    instructor_id = fields.Many2one('res.partner', string="Instructor")

    course_id = fields.Many2one('openacademy.course',

        ondelete='cascade', string="Course", required=True)

openacademy/views/openacademy.xml

                    <sheet>

                        <group>

                            <field name="name"/>

                            <field name="responsible_id"/>

                        group>

                        <notebook>

                            <page string="Description">

            field>

        record>

        

        <record model="ir.ui.view" id="course_tree_view">

            <field name="name">course.treefield>

            <field name="model">openacademy.coursefield>

            <field name="arch" type="xml">

                <tree string="Course Tree">

                    <field name="name"/>

                    <field name="responsible_id"/>

                tree>

            field>

        record>

        

                <form string="Session Form">

                    <sheet>

                        <group>

                            <group string="General">

                                <field name="course_id"/>

                                <field name="name"/>

                                <field name="instructor_id"/>

                            group>

                            <group string="Schedule">

                                <field name="start_date"/>

                                <field name="duration"/>

                                <field name="seats"/>

                            group>

                        group>

                    sheet>

                form>

            field>

        record>

        

        <record model="ir.ui.view" id="session_tree_view">

            <field name="name">session.treefield>

            <field name="model">openacademy.sessionfield>

            <field name="arch" type="xml">

                <tree string="Session Tree">

                    <field name="name"/>

                    <field name="course_id"/>

                tree>

            field>

        record>

        <record model="ir.actions.act_window" id="session_list_action">

            <field name="name">Sessionsfield>

            <field name="res_model">openacademy.sessionfield>

练习逆关联One2many
使用逆关联字段one2many,编辑模型以反映课程和授课之间的关系。

· 编辑Course类,并且加入字段到它的表单视图

openacademy/models.py

    responsible_id = fields.Many2one('res.users',

        ondelete='set null', string="Responsible", index=True)

    session_ids = fields.One2many(

        'openacademy.session', 'course_id', string="Sessions")

class Session(models.Model):

openacademy/views/openacademy.xml

                            <page string="Description">

                                <field name="description"/>

                            page>

                            <page string="Sessions">

                                <field name="session_ids">

                                    <tree string="Registered sessions">

                                        <field name="name"/>

                                        <field name="instructor_id"/>

                                    tree>

                                field>

                            page>

                        notebook>

                    sheet>

练习多对多关联many2many
在授课模型中添加关联字段many2many,将每次授课和参与的听众做关联,听众来自于内置模型res.partner。相应的调整对应的视图。

· 修改Session类并且加入字段到它的表单视图中

openacademy/models.py

    instructor_id = fields.Many2one('res.partner', string="Instructor")

    course_id = fields.Many2one('openacademy.course',

        ondelete='cascade', string="Course", required=True)

    attendee_ids = fields.Many2many('res.partner', string="Attendees")

openacademy/views/openacademy.xml

                                <field name="seats"/>

                            group>

                        group>

                        <label for="attendee_ids"/>

                        <field name="attendee_ids"/>

                    sheet>

                form>

            field>

 

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