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Home > Business & Other > Enterprise Resource Planning > Odoo Development Essentials
Odoo Development Essentials
Odoo Development Essentials

Odoo Development Essentials: Fast track your development skills to build powerful Odoo business applications

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Odoo Development Essentials

Chapter 2. Building Your First Odoo Application

Developing in Odoo most of the time means creating our own modules. In this chapter, we will create our first Odoo application, and you will learn the steps needed make it available to Odoo and install it.

Inspired by the notable todomvc.com project, we will build a simple to-do application. It should allow us to add new tasks, then mark them as completed, and finally clear the task list of all completed tasks.

You will learn how Odoo follows an MVC architecture, and we will go through the following layers during the to-do application implementation:

  • The model, defining the structure of the data
  • The view, describing the user interface
  • The controller, supporting the business logic of the application

The model layer is defined with Python objects that have their data is stored in the PostgreSQL database. The database mapping is automatically managed by Odoo, and the mechanism responsible for this is the object relational model, (ORM).

The...

Understanding applications and modules

It's common to hear about Odoo modules and applications. But what exactly is the difference between them? Modules are building blocks of Odoo applications. A module can add or modify Odoo features. It is supported by a directory containing a manifest or descriptor file (named __openerp__.py) and the remaining files that implement its features. Sometimes, modules can also be referred to as "add-ons." Applications are not different from regular modules, but functionally, they provide a central feature, around which other modules add features or options. They provide the core elements for a functional area, such as accounting or HR, around which other modules add features. Because of this, they are highlighted in the Odoo Apps menu.

Modifying and extending modules

In the example that will follow, we will create a new module with as few dependencies as possible.

This will not be the typical case, however. The most frequent situation is where modifications or extensions are needed on an already existing module to fit some specific use cases.

The golden rule is that we shouldn't modify existing modules by changing them directly. It's considered bad practice to modify existing modules. This is especially true for the official modules provided by Odoo. Doing so does not allow a clear separation between the original module code and our modifications, and makes it difficult to apply upgrades.

Instead, we should create new modules to be applied on top of the modules we want to modify, and implement those changes. This is one of Odoo's main strengths: it provides "inheritance" mechanisms that allow custom modules to extend existing modules, either official or from the community. The inheritance is possible...

Creating a new module

Our module will be a very simple application to keep to-do tasks. These tasks will have a single text field, for the description, and a checkbox to mark them as complete. We will also have a button to clean the to-do list from the old completed tasks.

These are very simple specifications, but throughout the book we will gradually add new features to it, to make it more interesting for the users.

Enough talk, let's start coding and create our new module.

Following the instructions in Chapter 1, Getting Started with Odoo Development, we should have the Odoo server at /odoo-dev/odoo/. To keep things tidy, we will create a new directory alongside it to host our custom modules:

$ mkdir ~/odoo-dev/custom-addons

An Odoo module is a directory containing an __openerp__.py descriptor file. This is still a legacy from when Odoo was named OpenERP, and in the future is expected to become __odoo__.py.

It also needs to be Python importable, so it must also have an __init__.py file...

Adding to the addons path

Now that we have a new module, even if minimal, we want to make it available in Odoo.

For that, we need to make sure the directory the module is in is part of the addons path. And then we need to update the Odoo module list.

Both operations have been explained in detail in the previous chapter, but we will follow here with a brief overview of what is needed.

We will position in our work directory and start the server with the appropriate addons path configuration:

$ cd ~/odoo-dev
$ odoo/odoo.py -d v8dev --addons-path="custom-addons,odoo/addons" --save

The --save option saves the options you used in a config file. This spares you from repeating them the next time you restart the server: just run ./odoo.py and the last saved options will be used.

Look closely at the server log. It should have an INFO ? openerp: addons paths: (...) line, and it should include our custom-addons directory.

Remember to also include any other addons directories you might be using...

Installing the new module

The Local Modules option shows us the list of available modules. By default it shows only Apps modules. Since we created an application module we don't need to remove that filter to see it. Type "todo" in the search and you should see our new module, ready to be installed.

Installing the new module

Now click on its Install button and you're done!

Understanding applications and modules

It's common to hear about Odoo modules and applications. But what exactly is the difference between them? Modules are building blocks of Odoo applications. A module can add or modify Odoo features. It is supported by a directory containing a manifest or descriptor file (named __openerp__.py) and the remaining files that implement its features. Sometimes, modules can also be referred to as "add-ons." Applications are not different from regular modules, but functionally, they provide a central feature, around which other modules add features or options. They provide the core elements for a functional area, such as accounting or HR, around which other modules add features. Because of this, they are highlighted in the Odoo Apps menu.

Modifying and extending modules

In the example that will follow, we will create a new module with as few dependencies as possible.

This will not be the typical case, however. The most frequent situation is where modifications or extensions are needed on an already existing module to fit some specific use cases.

The golden rule is that we shouldn't modify existing modules by changing them directly. It's considered bad practice to modify existing modules. This is especially true for the official modules provided by Odoo. Doing so does not allow a clear separation between the original module code and our modifications, and makes it difficult to apply upgrades.

Instead, we should create new modules to be applied on top of the modules we want to modify, and implement those changes. This is one of Odoo's main strengths: it provides "inheritance" mechanisms that allow custom modules to extend existing modules, either official or from the community. The inheritance is possible at all levels data models...

Creating a new module

Our module will be a very simple application to keep to-do tasks. These tasks will have a single text field, for the description, and a checkbox to mark them as complete. We will also have a button to clean the to-do list from the old completed tasks.

These are very simple specifications, but throughout the book we will gradually add new features to it, to make it more interesting for the users.

Enough talk, let's start coding and create our new module.

Following the instructions in Chapter 1, Getting Started with Odoo Development, we should have the Odoo server at /odoo-dev/odoo/. To keep things tidy, we will create a new directory alongside it to host our custom modules:

$ mkdir ~/odoo-dev/custom-addons

An Odoo module is a directory containing an __openerp__.py descriptor file. This is still a legacy from when Odoo was named OpenERP, and in the future is expected to become __odoo__.py.

It also needs to be Python importable, so it must also have an __init__.py file.

The...

Adding to the addons path

Now that we have a new module, even if minimal, we want to make it available in Odoo.

For that, we need to make sure the directory the module is in is part of the addons path. And then we need to update the Odoo module list.

Both operations have been explained in detail in the previous chapter, but we will follow here with a brief overview of what is needed.

We will position in our work directory and start the server with the appropriate addons path configuration:

$ cd ~/odoo-dev
$ odoo/odoo.py -d v8dev --addons-path="custom-addons,odoo/addons" --save

The --save option saves the options you used in a config file. This spares you from repeating them the next time you restart the server: just run ./odoo.py and the last saved options will be used.

Look closely at the server log. It should have an INFO ? openerp: addons paths: (...) line, and it should include our custom-addons directory.

Remember to also include any other addons directories you might be using. For instance...

Installing the new module

The Local Modules option shows us the list of available modules. By default it shows only Apps modules. Since we created an application module we don't need to remove that filter to see it. Type "todo" in the search and you should see our new module, ready to be installed.

Now click on its Install button and you're done!

Upgrading a module

Developing a module is an iterative process, and you will want changes made on source files to be applied and visible in Odoo.

In most cases this is done by upgrading the module: look up the module in the Local Modules list and, since it is installed, you will see an Upgrade button available.

However, when the changes are only in Python code, the upgrade may not have an effect. Instead of a module upgrade, an application server restart is needed.

In some cases, if the module has changed both in data files and Python code, you might need both operations. This is a common source of confusion for newcomer Odoo developers.

But fortunately, there is a better way. The simplest and fastest way to make all our changes to a module effective is to stop (Ctrl + C) and restart the server process requesting our modules to be upgraded on our work database.

To start the server upgrading the todo_app module in the v8dev database, we will use:

$ ./odoo.py -d v8dev -u todo_app

The -u option...

Creating an application model

Now that Odoo knows about our new module, let's start by adding to it a simple model.

Models describe business objects, such as an opportunity, a sales order, or a partner (customer, supplier, and so on.). A model has a list of attributes and can also define its specific business.

Models are implemented using a Python class derived from an Odoo template class. They translate directly to database objects, and Odoo automatically takes care of that when installing or upgrading the module.

Some consider it good practice to keep the Python files for models inside a models subdirectory. For simplicity we won't be following that here, so let's create a todo_model.py file in the todo_app module main directory.

Add the following content to it:

# -*- coding: utf-8 -*-
from openerp import models, fields
class TodoTask(models.Model):
    _name = 'todo.task'
    name = fields.Char('Description', required=True)
    is_done = fields.Boolean('Done?')
    active = fields.Boolean...

Adding menu entries

Now that we have a model to store our data, let's make it available on the user interface.

All we need to do is to add a menu option to open the To-do Task model so that it can be used. This is done using an XML file. Just as in the case of models, some people consider it good practice to keep the view definitions inside a views subdirectory.

We will create a new todo_view.xml data file in the module's top directory, and it will declare a menu item and the action performed by it:

<?xml version="1.0"?>
<openerp>
  <data>

    <!-- Action to open To-do Task list -->
    <act_window id="action_todo_task"
      name="To-do Task"
      res_model="todo.task"
      view_mode="tree,form" />

    <!-- Menu item to open To-do Task list -->
    <menuitem id="menu_todo_task"
      name="To-Do Tasks"
      parent="mail.mail_feeds"
      sequence="20"
      action="action_todo_task" />

  </data>
</openerp>

The user interface, including...

Creating views – form, tree, and search

As we have seen, if no view is defined, Odoo will automatically generate basic views to get you going. But surely you would like to define the module views yourself, so that's what we'll do next.

Odoo supports several types of views, but the three main ones are: list (also called tree), form, and search views. We'll add an example of each to our module.

All views are stored in the database, in the ir.ui.view model. To add a view in a module, we declare a <record> element describing the view in an XML file that will be loaded into the database when the module is installed.

Creating a form view

Edit the XML we just created to add this <record> element just after the <data> opening tag at the top:

<record id="view_form_todo_task" model="ir.ui.view">
  <field name="name">To-do Task Form</field>
  <field name="model">todo.task</field>
  <field name="arch" type="xml">

    <form string="To-do Task">...

Adding list and search views

When viewing a model in list mode, a <tree> view is used. Tree views are capable of displaying lines organized in hierarchies, but most of the time they are used to display plain lists.

We can add the following tree view definition to todo_view.xml:

<record id="view_tree_todo_task" model="ir.ui.view">
  <field name="name">To-do Task Tree</field>
  <field name="model">todo.task</field>
  <field name="arch" type="xml">
    <tree colors="gray:is_done==True">
      <field name="name"/>
      <field name="is_done"/>
    </tree>
  </field>
</record>

We have defined a list with only two columns, name and is_done. We also added a nice touch: the lines for done tasks (is_done==True) are shown in grey.

At the top right of the list Odoo displays a search box. The default fields it searches for and available predefined filters can be defined by a <search> view.

As before, we will add this to the...

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Description

This book is intended for developers who need to quickly become productive with Odoo. You are expected to have experience developing business applications, as well as an understanding of MVC application design and knowledge of the Python programming language.

Who is this book for?

This book is intended for developers who need to quickly become productive with Odoo. You are expected to have experience developing business applications, as well as an understanding of MVC application design and knowledge of the Python programming language.
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Publication date : Apr 06, 2015
Length: 214 pages
Edition : 1st
Language : English
ISBN-13 : 9781784392796
Vendor :
Odoo S.A
Category :
Business & Other
Languages :
Python
Concepts :
Enterprise Resource Planning
Tools :
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ISBN-13 : 9781784392796
Vendor :
Odoo S.A
Category :
Business & Other
Languages :
Python
Concepts :
Enterprise Resource Planning
Tools :
VirtualBox

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Table of Contents

11 Chapters
1. Getting Started with Odoo Development Chevron down icon Chevron up icon
1. Getting Started with Odoo Development
Setting up a host for the Odoo server
Installing Odoo from source
Initializing a new Odoo database
A word about Odoo product versions
More server configuration options
Developing from your workstation
Enabling the on-board technical tools
Installing third-party modules
Summary
2. Building Your First Odoo Application Chevron down icon Chevron up icon
2. Building Your First Odoo Application
Understanding applications and modules
Modifying and extending modules
Creating a new module
Adding to the addons path
Installing the new module
Upgrading a module
Creating an application model
Adding menu entries
Creating views – form, tree, and search
Adding list and search views
Adding business logic
Setting up access control security
Row-level access rules
Adding an icon to the module
Summary
3. Inheritance – Extending Existing Applications Chevron down icon Chevron up icon
3. Inheritance – Extending Existing Applications
Adding sharing capability to the To-Do app
Extending the to-do task model
Extending views
More on using inheritance to extend models
Using inheritance to add social network features
Modifying data
Summary
4. Data Serialization and Module Data Chevron down icon Chevron up icon
4. Data Serialization and Module Data
Understanding external identifiers
Exporting and importing data
Module data
XML data files
Summary
5. Models – Structuring the Application Data Chevron down icon Chevron up icon
5. Models – Structuring the Application Data
Organizing application features into modules
Introducing the todo_ui module
Creating models
Creating fields
Relations between models
Computed fields
Model constraints
Summary
6. Views – Designing the User Interface Chevron down icon Chevron up icon
6. Views – Designing the User Interface
Window actions
Menu items
Context and domain
Form views
View elements
List views
Search views
Other types of views
Summary
7. ORM Application Logic – Supporting Business Processes Chevron down icon Chevron up icon
7. ORM Application Logic – Supporting Business Processes
To-do wizard
Working with the server
The execution environment
Model methods for client interaction
Summary
8. QWeb – Creating Kanban Views and Reports Chevron down icon Chevron up icon
8. QWeb – Creating Kanban Views and Reports
Getting started with kanban board
Design kanban views
Adding QWeb dynamic content
Creating business reports
Summary
9. External API – Integration with Other Systems Chevron down icon Chevron up icon
9. External API – Integration with Other Systems
Setting up a Python client
Calling the Odoo API using XML-RPC
Writing a Notes desktop application
Introducing the ERPpeek client
Summary
10. Deployment Checklist – Going Live Chevron down icon Chevron up icon
10. Deployment Checklist – Going Live
Installing Odoo
Using a reverse proxy
Server and module updates
Summary
Index Chevron down icon Chevron up icon
Index

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Javier Chacon May 19, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Daniel Reis really wrote a terrific book. This is one of the best books I've ever read about an application development environment completely new for me (as Odoo was some days ago). This book represented the guide I was looking for to learn about application development with Odoo.- The book conveys new key concepts in clear and direct way to be easily and quickly catched and applied even for completely new Odoo developers.- I was more than glad when realized that the book does not stop at just an introductory level of development in Odoo environment, but that it takes the reader to a higher level, boarding themes like for example application extension by using concepts like inheritance and other more elaborated topics, exposing them in very clear way too.This book follows Packt books great tradition of teaching by reading-doing-explaining-"and seing inmediate results" as part of the reader’s learning process.I got the book after its launching and I assure that the book’s worth its price.Thanks to Daniel Reis for such a great job!!!
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Marek Ilnicki Jun 13, 2015
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Very useful book.
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Axon ehf. Jul 09, 2015
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Explains well how to develop for Odoo. Recommended.
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Narayana Moturi Apr 19, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
'Practical' and 'Professional' to describe this book. After buying every online course available on Odoo technical , I could confidently say this is the ONLY best book ( Odoo technical resource) I found so far written professionally, having excellent command on software architecture in general the author has made the reader to start with basics and transfer into more in-depth technical details. It is indeed an "Essential" book to have for every Odoo developer.
Amazon Verified review Amazon
Cliente Amazon Nov 13, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Ottimo libro per chi è alle prime armi su odoo, utile per iniziare a sviluppare i propri moduli.Inutile se avete intenzione di capire come configurare una piattaforma odoo compelta.
Amazon Verified review Amazon

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Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

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  8. Guinea-bissau
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