Dear Sir

it's not worked for me as seen this error

except_orm: ('ValueError', 'The class Extend_BaseModel has to have a _name attribute')

First you have to inherit the class BaseModel and then can override the method.

Try this:

class Extend_BaseModel(BaseModel):
    def export_data(self, cr, uid, ids, fields_to_export, context=None):
        #Your code
        #You may call super also if you want like this: super(Extend_BaseModel, self).export_data(cr, uid, ids, fields_to_export, context=context)
        #Your code

Hope this will help you and solve you problem.

Thanks,

Serpent Consulting Services.

I achieve overriding BaseModel methods in V7 :

1- create a new python file my_basemodel.py

2- add your custom methods like this

from openerp.osv.orm import BaseModel

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

do_somthing

BaseModel.method = my_method    # Method is referring to an ORM methode (read, unlink, export_data, ...)

3- save the file and add it to __init__.py

4- Restart your server