圖書館管理系統我們之前做了有關成員的擴充功能，今天則是要來做借書的功能，並且追蹤圖書目前的狀況。
首先先來確定需要哪些欄位

• 圖書館會員借書(必須為會員才可以租借)

• 借書日期(預設今天)

• 誰借的書 (預設目前使用者)

• 借書清單，所需的書籍(一本OR多本)

另外借書:

• 確定使用者目前階段 草稿-開啟-借用-歸還或取消
• 書籍應該歸還的日期
• 書籍歸還的日期

再來是建立library_checkout模組，跟之前做library_member有些相似，，在library_app旁邊建立新的目錄。
先分別到__manifest__.py

{ "name": "Library Book Checkout",

  "description": "Members can borrow books from the

    library.",

  "author": "Daniel Reis",

  "depends": ["library_member"],

  "data": [

    "security/ir.model.access.csv",

    "views/library_menu.xml",

    "views/checkout_view.xml",

  ],

}

跟__init__.py

from . import models
from . import library_checkout

再新增models/library_checkout.py

from odoo import fields, models

class Checkout(models.Model):

    _name = "library.checkout"

    _description = "Checkout Request"

    member_id = fields.Many2one(

        "library.member",

        required=True,

    )

    user_id = fields.Many2one(

        "res.users",

        "Librarian",

        default=lambda s: s.env.user,

    )

    request_date = fields.Date(

        default=lambda s: fields.Date.today(),

    )

再來設置存取規則、選單項目和一些基本views，讓我們的module可以使用。
到security/ir.model.access.csv

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink

checkout_user,Checkout User,model_library_checkout,library_app.library_group_user,1,1,1,1

views/library_menu.xml

<odoo>

  <record id="action_library_checkout"

          model="ir.actions.act_window">

    <field name="name">Checkouts</field>

    <field name="res_model">library.checkout</field>

    <field name="view_mode">tree,form</field>

  </record>

  <menuitem id="menu_library_checkout"

            name="Checkout"

            action="action_library_checkout"

            parent="library_app.menu_library"

  />

</odoo>

views/checkout_view.xml

<odoo>

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

    <field name="name">Checkout Tree</field>

    <field name="model">library.checkout</field>

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

        <tree>

            <field name="request_date" />

            <field name="member_id" />

        </tree>

    </field>

  </record>

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

    <field name="name">Checkout Form</field>

    <field name="model">library.checkout</field>

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

      <form>

        <sheet>

          <group>

            <field name="member_id" />

            <field name="request_date" />

            <field name="user_id" />

          </group>

        </sheet>

      </form>

    </field>

  </record>

</odoo>

接下來安裝**-i跟更新-u**library_checkout，就能有基本需求。
另外對租借要怎麼管理，要來處理借書的訂單:
到models/library_checkout.py新增一對多的欄位

line_ids = fields.One2many(

        "library.checkout.line",

        "checkout_id",

        string="Borrowed Books",

    )
    

將新的model field 加入models/init.py

from . import library_checkout_line

models/library_checkout_line.py 新增以下指令

from odoo import api, exceptions, fields, models

class CheckoutLine(models.Model):

    _name = "library.checkout.line"

    _description = "Checkout Request Line"

    checkout_id = fields.Many2one(

        "library.checkout",

        required=True,

    )

    book_id = fields.Many2one("library.book",

      required=True)

    note = fields.Char("Notes")
    

到security/ir.model.access.csv

checkout_line_user,Checkout Line User,model_library_checkout,library_app.library_group_user,1,1,1,1

新增views/checkout_view.xml，用notebook來顯示我們租借哪些書:

          <notebook>

            <page name="lines">

              <field name="line_ids">

                <tree editable="bottom">

                  <field name="book_id" />

                  <field name="note" />

                </tree>

              </field>

            </page>

          </notebook>