Event on-delete on One2many widget in Odoo

Question

I have a one2many widget that I need to have a condition when the user deletes any row.

Is there an on delete method that I can override? I have tried with unlink method but it doesn't get executed by the one2many widget. And the row are still being deleted.

<field context="{'medical_quotation_id': medical_quotation_id, 'outpatient_id': id}" name="medical_quotation_line_ids" widget="one2many_list">
    <tree string="Medical Quotation Lines" create="false">
        <field name="sequence" widget="handle" />
        <field name="medical_quotation_so_id" />
        <field name="dealer" />
        <field name="product_id" invisible="1"
            on_change="onchange_product_id(product_id, product_uom_qty, False, name)" />
        <field name="name" />
        <field name="lot_id" />
        <field name="remark" />
        <field name="product_uom_qty"
            on_change="onchange_product_id(product_id, product_uom_qty, False, name)" />
        <field name="product_uom" options="{'no_open': True}" />
        <field name="price_unit" />
        <!-- <field name="tax_id" widget="many2many_tags" domain="[('parent_id','=',False),('type_tax_use','&lt;&gt;','purchase')]" /> -->
        <field name="discount" />
        <field name="price_subtotal" />
    </tree>
</field>


@api.multi
def unlink(self):
    # import ipdb; ipdb.set_trace()
    for rec in self:
        if rec.medical_quotation_so_id:
            raise Warning(_('Cannot delete the line that has been invoiced!'))
        if rec.dealer == 'system':
            raise Warning(_('Cannot delete rows created by the system!'))
    return super(MedicalQuotationLine, self).unlink()

Any ideas?

Ah, Odoo 8 i was wondering why it shouldn't work your way, but yes in that version it wasn't calling unlink on One2many field deletes. Try to look into the parent model's write method, at least there should be something like those black magic triple commands, which can be used. — CZoellner
Are you suggesting to compare previous One2many with current One2many? Will try that, thanks. — strike_noir
No the write values will have triple commands. Just look into the docstring of Model.write(). There are the magic numbers for deletion documented. — CZoellner
stackoverflow.com/questions/9377402/… you can find the magic numbers in the first response — Mohammed Janati Idrissi

Dipen Shah Dipen Shah · Accepted Answer · 2020-03-13T05:31:51

Try to apply in this way,

def unlink(self, cr, uid, ids, context=None):
    for res in self.browse(cr, uid, ids, context=context):
        if res.medical_quotation_line_ids: 
            raise osv.except_osv(_('Error!'), _('Cannot delete the line that has been invoiced!'))
    return super(MedicalQuotationLine, self).unlink(cr, uid, ids, context=context)

Thanks

Event on-delete on One2many widget in Odoo

1 Answers