how get id with onchange for filtering

问题

how can i retrieve the value of a many2one field or its ID from another model for exemple:

class Contrat(models.Model):
_name = 'facturation.contrat'
contrat_parent_id = fields.Many2one('facturation.contrat', string='Numéro Contrat Client',
                              domain=[('is_prestataire', '=', False)])



class Lot(models.Model):
contrat_id = fields.Many2one('facturation.contrat', ondelete='cascade')
articlecontrat_ids = fields.Many2many('facturation.articleouvrage',string='Article Lot')

91/5000 i want that when i change contrat_parent_id i get it back to use it and filter my articles for field 'articlecontrat_ids'

回答1:

here you need to use onchange event i'm assuming that facturation.articleouvrage have a m2o field named contrat_id

# in onchange event always put the name of the field that trigger the event 
@api.onchange('contrat_parent_id ')
def onchange_contrat(self):
    """update the domain when we change the contrat"""
    if self.contrat_parent_id :
        # always check if the field is not empty
        # return the domain like this but i don't know what you need exactly
        return {'domain': {'articlecontrat_ids ' : [('contrat_id ', '=', self.contrat_parent_id.contract.id)]}}
    else: # remove the domain 
        return {'domain': {'articlecontrat_ids ' : []}}

if you want to remove all records when user change the contrat_id but i think you make the user ungry to reselect all this records.

    self.articlecontrat_ids = [(5, 0, 0)]

来源：https://stackoverflow.com/questions/47123563/how-get-id-with-onchange-for-filtering