Question

在覆盖模型保存方法的同时，如何使用cursor.execute（“ UPDATE ...”更新另一个模型。

我有2个模型

class Medication_List(models.Model):
    id = models.AutoField(primary_key=True)
    medication_name=models.CharField(max_length=250, blank=True, editable=True)
    medications_category = models.ForeignKey(Medication_Category,on_delete=models.CASCADE, blank=False, default=1)
    stock = models.DecimalField('Current Stock Level', max_digits=10,decimal_places=2, blank=True, default=0.00)

class Medications_Bridge(models.Model):

    id = models.AutoField(primary_key=True)
    order_details =models.ForeignKey(GeneralConsulting, on_delete=models.CASCADE)
    medication_name_id = models.ForeignKey(Medication_List, on_delete=models.CASCADE)

    def save(self, *args, **kwargs):
    quantity_sold = Medications_Bridge.objects.raw("SELECT *,..... )
    .....
    quantity_received = New_stock_purchases.objects.raw("SELECT *,.....)

    for e in quantity_sold:
        if e.total_quantity_sold == None:
            return 0
        else:
            return e.total_quantity_sold

    for r in quantity_received:
        if r.total_quantity_received == None:
            return 0
        else:
            return r.total_quantity_received

    current_stock = r.total_quantity_received - e.total_quantity_sold



    cursor.execute("UPDATE medication_productsapp_medication_list SET stock = %s WHERE id = %s" % (current_stock, self.medication_name_id.id))
    transaction.set_dirty()
    transaction.commit()

    #i already tried transaction.commit_unless_managed() but it  didn't work

    super(Medications_Bridge, self).save(*args, **kwargs)

当我保存一条记录时，我的光标功能没有任何反应。它不会更新其他模型的记录。

在django中有可能发生这种事吗？还是我想念一些东西？

我知道我可以使用信号，但是我有一个循环导入问题，这限制了我使用信号的能力。 @receiver装饰器不断给我一个错误，因为Medications_Bridge（models.Model）已经导入了Medication_List（models.Model）。

任何帮助将不胜感激。

django cursor.execute（“ UPDATE ... another model），同时保存当前模型表格

0 个答案: