Add values on One2many field onchange

Question

I'm trying to add values in my one2many field onchange. I tried using the [(0,0, {values})] but nothing happened. Any idea on how to implement it?

custom_line_ids = fields.One2many('mrp.production', 'product_id', 'Custom Line')   
@api.onchange('product_id')
    def add_custom_line_ids(self):
        mrp = self.env['mrp.productions'].search([])
        result = []
        
        vals = {
                'sequence': self.sequence,
                'name': self.name,
                'product_id': self.product_id,
                'date_planned_start': self.date_planned_start,
                'state': self.state,
            }
        self.update({'custom_line_ids':[(0, 0, vals)]})

Answer 1

Actually you are using update method, which only update the model's value but not yet stored on database. You should use write method instead.

Answer 2

You need to return the value in onchange. This would work:

custom_line_ids = fields.One2many('mrp.production', 'product_id', 'Custom Line')   

@api.onchange('product_id')
def add_custom_line_ids(self):
    vals = {}
    mrp_ids = self.env['mrp.productions'].search([])
    if mrp_ids:
        for mrp in mrp_ids:
            vals['custom_line_ids']=[(0,0,{
                'date': mrp.date,  
               
            })]
    return {'value': vals}