根据条件获取其他模型字段的总和

Question

我想将得到的总场的总和ru.invoice上显示ru.students如果name字段ru.students等于student_id的ru.invoice 。

我使用了browse方法，但是它不起作用。

class ru_students(models.Model):
    _name = 'ru.students'
    _rec_name = 'code'

def _get_total(self, cr, uid, ids, context=None):
    pool_re = self.pool.get('ru.invoice')
    pool_rec = pool_re.browse(cr, uid, ids, [('name','=','student_id')],    
context=context)
    for field in self:
        for line in pool_rec:
            x = 0.0
            x += line.total
            field.payed += x

    name = fields.Char(string="Name")
    payed = fields.Float(compute="_get_total")


   class ru_invoice(models.Model):
       _name = 'ru.invoice'
       _rec_name = 'code'

    @api.multi
    @api.depends('qty','unit_price')
    def get_total(self):
        for rec in self:
            x = 0.0
            x = rec.qty * rec.unit_price
            rec.total = x


student_id = fields.Many2one('ru.students','Student ID")
qty = fields.Float(string="Quantity")
unit_price = fields.Float(string="Unit Price")
total = fields.Float(compute="_get_totals",string="Total")

Answer 1

首先，请注意不要将API7代码与API8代码混合使用，请尽可能使用API​​8代码（此外，使用API​​8会容易得多）。 我认为您希望在您的字段上payed （也请检查ru_invoice类，因为我在那里更正了一些内容- 例如：在total字段中，当您想调用_get_total时，您已经在compute编写了_get_totals ）。

class ru_students(models.Model):
    _name = 'ru.students'
    _rec_name = 'code'

    @api.multi
    @api.depends('invoices')
    def _get_total(self):
        for student in self:
            student.payed = sum(
                invoice.total for invoice in student.invoices)

    name = fields.Char(string='Name')
    payed = fields.Float(compute='_get_total', string='Payed')
    invoices = fields.One2many(comodel_name='ru.invoice',
                               inverse_name='student_id',
                               string='Invoices of the student')


class ru_invoice(models.Model):
    _name = 'ru.invoice'
    _rec_name = 'code'

    @api.multi
    @api.depends('qty', 'unit_price')
    def _get_total(self):
        for invoice in self:
            invoice.total = invoice.qty * invoice.unit_price

    student_id = fields.Many2one(comodel_name='ru.students',
                                 string='Student ID')
    qty = fields.Float(string='Quantity')
    unit_price = fields.Float(string='Unit Price')
    total = fields.Float(compute='_get_total', string='Total')