Dear all,

I need to have a form view were user will be able to select a value from a list, based on a previous selected value on another related field. It will use the same approach as the Country / States on partners form were user selects a Country and Odoo will show all states for the selected Country.

I am learning Odoo developement and I am using Odoo version 9 for this module.

The module.py has 3 classes (just an example):

- Vehicles class: for registering vehicles;

- Brands class: for registering vehicles brands - related to models class below;

- Models class: for registering vehicle brand models - related to brands class;

The classes definition

class vehicle_vehicle(models.Model):
    _name='vehicle.vehicle'
    _columns = {
        'name' : fields.char('Name', size=64, required=True),
        'brand_id' : fields.many2one('vehicle.brand','Brand'),
        'model_id' : fields.many2one('vehicle.model','Model'),
    }

class vehicle_brand(models.Model):
    _name='vehicle.brand'
    _columns = {
        'name' : fields.char('Name', size=32, required=True),
        'model_ids' : fields.one2many('vehicle.model','brand_id',string='Models'),
    }

class vehicle_model(models.Model):
    _name='vehicle.model'
    _columns = {
        'name' : fields.char('Name', size=40, required=True),
        'brand_id' : fields.many2one('vehicle.brand','Brand'),
    }

I have a form view for the vehicles were I do need to allow user to select a "brand" and under "models" list all models related to the selected brand :

    <record id="vehicle_vehicle_form_view" model="ir.ui.view">
        <field name="name">vehicle.vehicle.form.view</field>
        <field name="model">vehicle.vehicle</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form string="Vehicles">
                <sheet>
                    <group>
                        <field name="name"/>
                        <field name="brand_id"/>
                        <field name="model_id"/>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

How can I achieve that?

Thank you all in advance

Best regards

Paulo