[FIXED] How to make onchange field editable only for draft state?

Issue

I have onchange field, and i need to make it readonly for all state except the draft state. My .py file:

class SaleOrderInherited(models.Model):
_inherit = 'sale.order' 

custom_field = fields.Char(string='Test', store=True, default=randint(1, 1000)
)

@api.onchange('tax_totals_json', 'date_order')
def _onchage_test(self):
    for record in self:
        if int(json.loads(record.tax_totals_json)['amount_total']) == 0:
            record.custom_field = randint(1, 1000)
        else:
            record.custom_field = f"{json.loads(record.tax_totals_json)['amount_total']} - {record.date_order}"

My .xml file:

<odoo>
  <data>
    <!--Inherit the sale order form view--> 
    <record id="view_sale_order_custom" model="ir.ui.view"> 
        <field name="name">sale.order.custom.form.inherited</field>
        <field name="model">sale.order</field> 
        <field name="inherit_id" ref="sale.view_order_form"/> 
        <field name="arch" type="xml"> 
            <xpath expr="//field[@name='partner_id']" position="after"> 
                <field name="custom_field"/>
            </xpath> 
        </field> 
    </record>
  </data>
</odoo>

I tried to use attrs="{'readonly':[('state','!=','draft')]}" in xml, and tried use states={'draft': [('readonly', False)], 'sent': [('readonly', True)]} in py. Both variations works on Char field, but didnt give any result there.

Solution

Set the readonly attribute to True then use states to make the field editable in draft state. You can find an example in sale_management module:

sale_order_template_id = fields.Many2one(
    readonly=True, check_company=True,
    states={'draft': [('readonly', False)], 'sent': [('readonly', False)]})

Using only attrs in XML arch should be enough to make the field read-only using a domain, the attrs you used should work (tested)

Answered By - Kenly