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Boris Giordanengo

Hello,

I have a model like this:

class Main(models.Model):
    _name ='main'

    name = fields.Char(string='Name')
    relation_id = fields.Many2one(string='Relation', comodel_name='relation')

I have one 'relation' record for each 'main' record.

Of course, I can merge the two tables.
But it is possible to have a XML file like this which create the 'main' record as well as the 'relation' record at the same time ?
<odoo>

<record id="my_id" model="ir.ui.view">
<field name="name">main.form.view</field>
<field name="model">main</field>
<field name="type">form</field>
<field name="arch" type="xml">
    <form>
        <sheet>
        	​	​<group>
            	​	​<field name="name"/>
        	​	​</group>
	​	​	​<notebook>
	​	​	​	​<page string="relation">
                     <field name="relation_id">
                        <form>
                           <field name="name_relation"/>
                           <field name="second_field"/>
                        </form>
                     </field>
     	​	​	​</page> 
             </notebook>
        </sheet>
    </form>
</field>
</record>

</odoo>

Thanks in advance,

Boris

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Christoph Farnleitner

Can your nested form node not just simply become a list? I don't really get what you are trying to achieve with this setup, hence also can't tell you what you may do for the moment.

Boris Giordanengo
Author

Christoph Farnleitne ,I merge the two table and solve my problem.


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Piyush H
Best Answer

Problem

You want to create both a main record and its linked relation record in one form view, without merging the models.

Your current XML tries to embed a <form> inside a <field>, which isn't valid Odoo syntax.

Correct Approach

Use inline editing with the options attribute on the many2one field. Here’s how:

1. Update Your XML View

xml

<record id="view_main_form" model="ir.ui.view">
    <field name="name">main.form.view</field>
    <field name="model">main</field>
    <field name="arch" type="xml">
        <form>
            <sheet>
                <group>
                    <field name="name"/>
                </group>
                <notebook>
                    <page string="Relation">
                        <field name="relation_id" 
                               options="{'no_open': True, 'no_create': False}"
                               context="{'form_view_ref': 'your_module.view_relation_form'}"/>
                    </page>
                </notebook>
            </sheet>
        </form>
    </field>
</record>
2. Create a Separate Form View for relation

Define a simplified form for quick creation:

xml

<record id="view_relation_form" model="ir.ui.view">
    <field name="name">relation.popup.form</field>
    <field name="model">relation</field>
    <field name="arch" type="xml">
        <form>
            <group>
                <field name="name_relation"/>
                <field name="second_field"/>
            </group>
        </form>
    </field>
</record>

3. Key Attributes Explained

  • options="{'no_open': True}": Prevents opening the full record view.
  • no_create: Set to False to allow new record creation.
  • context="{'form_view_ref': ...}": Forces the popup to use your custom form.
Alternative: Default Values

If you always want to auto-create a relation when creating a main record:

1. Override create in main model

python

@api.model
def create(self, vals):
    if not vals.get('relation_id'):
        relation = self.env['relation'].create({
            'name_relation': vals.get('name') + " Relation",
            'second_field': "Default Value",
        })
        vals['relation_id'] = relation.id
    return super().create(vals)
Result

Now when you:

  1. Create a new main record,
  2. Click the relation_id field,
  3. Select "Create and Edit",
  4. A popup with your custom relation form appears.

After saving both forms, the records are linked automatically.

Why This Works
  • Odoo’s many2one field natively supports inline creation.
  • The options and context attributes control the behavior.
  • No need for nested <form> tags (which aren’t supported).

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(Need further customization? Drop a comment—I’m happy to refine the solution!)

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srikesh infotech
Best Answer

In Odoo, a Many2one field by default shows as a dropdown list with a search option. However, when we define a nested <form> inside a <field name="relation_id"> (like in your example), Odoo shows the linked record in a form view, allowing users to create or edit the related record directly from the main form.

When you open the Many2one field in the UI, Odoo shows a mini form with all the fields of the related model.

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