How to get old value using on_change method?

Question

Hi everybody,

I have many2one partner_id and one2many recommendation_ids fields in my form view. I need to return old partner_id value if there are some records in recommendation_ids field.

*.xml

<field name="partner_id" on_change="onchange_partner_id(partner_id, recommendation_ids)"/>
...
<field name="recommendation_ids" />

*.py

def onchange_partner_id(self, cr, uid, ids, partner_id, recommendation_ids, context=None):
    return {'value': old_partner_id}

Thanks

Prajul P T · Accepted Answer

Hi, onchange event does not save the result of the onchange function to the database. It is saved only when we click on the save button. So if you browse the current record and fetch the partner_id, it will fetch the older partner_id.

Ankit H Gandhi(AHG) · Answer

Hello
You need to create 2 extra fields to achieve this things.
Hope below Example help full you and version should be above odoo 8.0
*Define fields*
partner_id = fields.Many2one('res.partner',  'Partner') # This standard field.
partner_id_new =  fields.Many2one('res.partner',  'Partner New') # This custom field.
partner_id_old =  fields.Many2one('res.partner',  'Partner' Old) # This custom field.
*Define onchange method*
@api.onchange('partner_id')
def onchange_partner_id(self):
OldPartner  = s

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