How to set default value for a many2one field in Odoo 9.0c?

Question

Hello everyone, I have customized a module that include a many2one field. Now, I would like to set the default value for that field with the codition is: [[u'bom_ids', u'!=', False]]. i have tried below code but it did not work probebly
width_id = field.Many2one('sale.order.line.width', default ='_get_width_default')
def _get_width_default(self, cr, uid, context=None):
res = self.pool.get('product.template').search(cr, uid, [(u'bom_ids', u'!=', False)], context=context)
return res and res[0] or

Axel Mendoza · Accepted Answer

You are using the old api way to specify default values for fields. Put it like this:
*_defaults* = {
'width_id' : _get_width_default,
}

Qutechs, Ahmed M.Elmubarak · Answer

Hi,
In your _get_width function your querying the product.template model which doesn't match with your field's comodel 'sale.order.line.width'. Also you'r using field not fields:

you can try the below code:
@api.model
def _get_width_default(self):
res = self.env['*sale.order.line.width*'].search([('bom_ids', '!=', [])], limit=1)
return res and res.id or False
width_id = field*s*.Many2one(*'sale.order.line.width*', default=_get_width_default)
Hope this could helps

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