odoo validation error when trying to create a stock.move from onchange function - odoo

Question

So i want to automatically create a move line (move_lines) in stock.picking from an #onchange function. Here's my function : It's just a small test. When the value of the field changed change, i take it as the id of the product (product_id) in the move line and then append that move line to the already existing list of move_lines.
NB1:move_lines is a One2many relation in stock.picking.
NB2:Declaration of product_id in stock.move :
product_id = fields.Many2one(
'product.product', 'Product',
domain=[('type', 'in', ['product', 'consu'])], index=True, required=True,
states={'done': [('readonly', True)]})
My function :
changed = fields.Integer('Changed')
#api.onchange('changed')
def _changed_onchange(self):
move_lines = []
for line in self.move_lines:
move_lines.append({'product_id': line.product_id.id or False,
'product_qty': line.product_qty or 0,
'name': line.product_id.name,
'product_uom': line.product_uom.id,
'date_planned': datetime.date.today(),
'date_expected': datetime.date.today()
})
move_lines.append({'product_id': self.changed,
'name': 'default',
'product_uom': 1,
'date_planned': datetime.date.today(),
'date_expected': datetime.date.today()
})
return {'value': {'move_lines': move_lines}}
If i created the move lines using the view then saved, everything works fine but when i change the value of the field so that a new move line is inserted by the function, the save doesn't work and i keep getting the error:
Odoo Server Error - Validation Error
The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set
[object with reference: product_id - product.id]
What is the problem ?

Answer 1

To append line to move_lines, You can use the following syntax:
#api.onchange('changed')
def _changed_onchange(self):
values = {'product_id': self.changed,
'name': 'default',
'product_uom': 1,
'date_planned': datetime.date.today(),
'date_expected': datetime.date.today(),
'location_id': 1,
'location_dest_id': 1
}
self.move_lines |= self.move_lines.create(values)
To achieve it using your above logic you can try x2many values filling but I recommend you to use Set operations and you can find an example at Lunching wizards