Hi all, I'm getting little bit confused on how to do inheritance.

The case is that I want inheritance model "exist_A" and use it on model "new_B", of course, I want add some new field in new_B. In terms of database, I would like store them into model new_B. In another words, without affecting exist_A database. Is there any way to achieve this?

What I have tried is following:

PY file:

Class new_B(models.Model):

    # _name = new_B # if I define "_name", it shows that field "new_cloumn" not in " exist_A "

    _inherit = 'exist_A' # also I tried _inherits = { 'hr.expense':'id' }, but not sure this is the case I should use "_inherits"

    new_cloumn = fields.Char()

XML file:

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

    <field name="name"> tree.view.inherit.new_B </field>

    <field name="model">exist_A</field>

    <field name="inherit_id" ref=" exist_A.tree_view"/>

    <field name="mode">primary</field> <!-- other similar question's solution, but it is not working for me -->

    <field name="arch" type="xml">

        <xpath expr="//field[@name='name']" position="after">

            <field name="new_cloumn"/>

        </xpath>

    </field>

</record>

Any help will be appreciated! Thanks!