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Sudhir Arya (ERP Harbor Consulting Services) India

--Sudhir Arya (ERP Harbor Consulting Services)--
27218
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Ahmedabad, India
--Sudhir Arya (ERP Harbor Consulting Services)--

• Co-Founder & CTO at ERP Harbor Consulting Services

• ERP Consultant / ERP Customization / TechnoFunctional Expert having 7+ years of Experience in Odoo ERP.

• Sound knowledge in Python, Odoo (Open ERP), XML, PostgreSQL

• Domain knowledge of Sale Management, Purchase Management, Warehouse Management, Manufacturing, Multi Company Configuration & Management, HR Management, Medical Management, Construction Management, Education Management, Point of Sale, Third Party Integrations

• Good knowledge and experience in payment gateway integration with Odoo

• Active Memeber on Stackoverflow 

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Skype:sudhir@erpharbor.com
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Sudhir Arya (ERP Harbor Consulting Services) India
6/13/13, 9:29 AM

If you want to extend or customize anything for particular object/class _inherit is used. It is a single object/class inheritance.

When you use _inherit and add new fields, those fields will be added inside inherited object. No other table will be created in database.

For example I want to add one or more field(s) or I want to add/override method in sale.order then I will use:

class sale_order(osv.Model):
    _inherit = 'sale.order'
    _columns = {
        'my_field': fields.char('My New Field', size=50),
    }

    def my_new_method(self, cr, uid, ids, context=None):
        ...
        ...

If I want to use anything (fields or methods) of any object and I want to achieve multiple inheritance, then I will use _inherits which allows you to use features of any object. That means you can directly use fields and methods of inherited object.

When you use _inherits and new table is created in database. That will have your own fields and field ID of inherited object.

For example in hr.employee object resource.resource object is inherited. So you can see fields of hr.employee object and resource_id of resource.resource object.


Now lets talk about code you want to know.

def unlink(self, cr, uid, ids, context=None):
          resource_ids = []
          for employee in self.browse(cr, uid, ids, context=context):
          resource_ids.append(employee.resource_id.id)
           return self.pool.get('resource.resource').unlink(cr, uid, resource_ids, context=context)

This method will be called when I will delete any employee record.

When any employee record is deleted, resource record related to employee will also be deleted.

Have a look at What is _inherit and What is _inherits.

Hope my answer will help you.

2 Comments
omprakash India
6/14/13, 2:40 AM

Hi Sudhir Arya , Thanks for immediate reply . You are such good friend for me . I will try in my code , If any doubt raise in my mind i will ask you . And once again thanks for reply

omprakash India
6/14/13, 4:15 AM

Hi Sudhir Arya , Finally i like to conclude - As you mentioned _inherits has the property to access (methods) of any object . Can you please explain with example . Please still not clear at this point .

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