To create a wizard for a module, we need to create a wizard folder; this folder will be imported in our main __init__.py of the module. The wizard folder will contain another __init__.py which will import all the wizard class files.

The Wizard Folder

The wizard folder consists of the following:

1. init.py
2. wizard.py or more wizards
3. wizard_view.xml or more wizard views

_init_.py(wizard):

import add_subjects

add_student.py:

from osv import osv,fields

class add_subjects(osv.osv_memory):
    _name = "add.subjects"
    _description = "subjects"
    _columns = {
                'subject_line':fields.one2many('subject.line', 'subject_id', 'Subjects'),
                }
    def _get_subjects(self,cr, uid, ctx):
        if 'active_id' in ctx:
            return self.pool.get('student').browse(cr,uid,ctx['active_id']).subject_line
        return False

    _defaults = {
                'subject_line': _get_subjects
                }

    def subjects(self, cr, uid, ids, context=None):
        if 'active_id' in context:
            subject=self.browse(cr,uid,ids)[0].subject_line
        self.pool.get('student').write(cr,uid,context['active_id'],
                                                 {'subject_line' : subject})
         return{'type': 'ir.actions.act_window_close',}

add_subjects()

The major difference between a model and a wizard is the osv.osv_memory. In OpenErp 6.1, any wizard you create has osv.osv_memory as a parameter, whereas a model will have osv.osv. Declare all the necessary fields and methods.

add_subjects_view.xml:

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="view_add_subjects" model="ir.ui.view">
            <field name="name">add.subjects.form</field>
            <field name="model">add.subjects</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
            <form string="Subjects">
                    <group colspan="4" >
                        <separator string="Adding Subjects" colspan="4"/>
                        <field colspan="4" name="subject_line" nolabel="1" mode="tree,form">
                                <tree string="Subject Lines">                                    
                                    <field name="title"/>
                                    <field name="out_of"/>
                                    <field name="marks"/>                                    
                                </tree>
                        </field>
                        <newline/>
                    </group>
                           <separator string="" colspan="4" />                    
                        <button icon="gtk-cancel" special="cancel" string="Cancel"/>
                        <button icon="gtk-ok" name="subjects" string="Add" type="object"/>                 

            </form>
            </field>
          </record>

        <record id="action_add_subjects" model="ir.actions.act_window">
            <field name="name">Add Subjects</field>            
            <field name="res_model">add.subjects</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree,form</field>
           <field name="view_id" ref="view_add_subjects"/>
           <field name="target">new</field>
        </record>

        <act_window id="action_add_subjects_values"
            key2="client_action_multi" name="Subjects Information"
            res_model="add.subjects" src_model="student"
            view_mode="form" target="new" view_type="form"/>
    </data>
</openerp>

Note the record action for this wizard; we have to create wizards action this way only. The attribute target is important and should always have value new so that it opens as a new window. The defines your wizards action in the ir.act_window table of your opener database.

The wizard is complete, you can add as many wizards as you wish and import all of them in the init.py of the wizard folder. Finally import this folder in the main __init__.py file of your module like:

import student

import wizard

Now in your view file from where you want to launch this wizard create a button and define the action id of the wizard as the name of the button:

subject_view.xml

<button name="%(action_add_subjects)d" string="Add Subjects" type="action"/>

_openerp_.py

{
"name" : "Student Information",
"version" : "1.0",
"author" : "EvonTech",
"category" : "Generic Modules/Others",
"depends" : ["base"],
"description" : "Student Information Management Module",
"init_xml": ["wizard/add_subjects_view.xml","student_view.xml"],
"update_xml" : [],
"demo_xml" : [],
"active" : False,
"installable" : True
}

Note: Always define your wizard views before the main view file in the init_xml attribute otherwise you will get an error No such external_id found: module.wizard_view.xml.