0

我是 Django 的新手。

我有一个Item模型，它有一个property_number字段和一个 FKlocation字段来Location建模。 property_number有这样的格式0000-00-00-0000-00这是[year] - [sub account] - [gl account] - [series number] - [location code]。在 的 格式下series_number，这应该是根据参数保存时生成的location_code。

示例：

位置代码： 10

Item 1

property number should be: 2021 - 01 - 01 - 0001 - 10

Item 2

property number should be: 2021 - 01 - 01 - 0002 - 10

Item 3

property number should be: 2021 - 01 - 01 - 0003 - 10... 等等，

property number should be: 2021 - 01 - 01 - 1000 - 10

位置代码： 50

Item 1

property number should be: 2021 - 01 - 01 - 0001 - 50

Item 2

property number should be: 2021 - 01 - 01 - 0002 - 50... 等等，

property number should be: 2021 - 01 - 01 - 0055 - 50

位置代码： 65

Item 1

property number should be: 2021 - 01 - 01 - 0001 - 65... 等等，

property number should be: 2021 - 01 - 01 - 0100 - 65

*在此示例中，对于位置代码 10，商品 1、商品 2 和商品 3的序列号为0001、0002 和 0003

对于位置代码 50，项目 1 和项目 2的数字系列为0001 和 0002

等等

每次一个新的Item会被保存到不同的区位码，number_series会被重置为0001，当新的Item被保存到相同的区位码时会继续

到目前为止我所拥有的

我已经可以通过覆盖save函数来保存格式，但我不知道如何生成所需的序列号。

def save(self, *args, **kwargs):
    self.property_number = '{}-{}-{}-{}'.format(self.date_acquired.year, self.sub_major_group_and_gl_account.sub_major_group_and_gl_account, 'This is where the series_number is place', self.location.location_code)
    super(Item, self).save(*args, **kwargs)

这是我到目前为止生成的series_number，但当然这是不正确的。我也不知道如何比较要保存的新数据和已经保存的数据。

def generate_series_number(self):
    # Get all records and filter by location.location_code and should be compare if there is already a data that has the same location_code
    get_item_location = Item.objects.all().filter(self.location.location_code=='This should be the latest data to be save')

    # Count how many data has the same location_code to know what number series to be assigned
    # if result is, there are already 50 records exist with location_code = '01', the new data will have the series number '51' 
    count_current_data = get_item_location.count()
    assign_series_number = count_current_data + 1

    return assign_series_number

# I will use the 'generate_series_number' function in the save function to format my Property_number field in the model.
def save(self, *args, **kwargs):
    self.property_number = '{}-{}-{}-{}'.format(self.date_acquired.year, self.sub_major_group_and_gl_account.sub_major_group_and_gl_account, 'series_number', self.location.location_code)
    super(Item, self).save(*args, **kwargs)

这是我的Item模型

class Item(models.Model):
    item                    = models.CharField(max_length=100, null=True)
    description             = models.TextField(max_length=200, null=True)
    date_acquired           = models.DateField(null=True)
    old_property_number     = models.CharField(max_length=100, null=True)
    property_number         = models.CharField(max_length=100, null=True, blank=True)
    unit_of_measure         = models.ForeignKey('Uom', related_name='uom_item', null=True, on_delete=models.SET_NULL)
    unit_value              = models.DecimalField(max_digits=12, decimal_places=2, null=True)
    quantity_per_card           = models.CharField(max_length=100, null=True, default='1')
    quantity_per_physical_count = models.CharField(max_length=100, null=True, default='1' )
    # location_code as primary key
    location                    = models.ForeignKey('Location', related_name='location_item', null=True, on_delete=models.SET_NULL)
    condition                   = models.ForeignKey('Condition', related_name='condition_item', null=True, on_delete=models.SET_NULL)
    accountable_person          = models.ForeignKey('Personnel', related_name='personnel_item', null=True, on_delete=models.SET_NULL)
    remarks                     = models.ForeignKey('Remarks', related_name='remarks_item', null=True, on_delete=models.SET_NULL)
    sub_major_group_and_gl_account    = models.ForeignKey('Account', related_name='sub_major_group_and_gl_account_item', null=True, on_delete=models.SET_NULL)

注意：我没有 view.py，我的工作只在管理站点内。

我是 Django 新手，不要生我的气 :) 提前谢谢。

4

1 回答 1

0

我正在回答我自己的问题。

我设法通过以下save功能解决了我的问题。如果有人可以改进我的解决方案，将不胜感激。

注意：这仅适用于通过管理站点新添加的实例，如果实例是通过 django-import-export 导入的，则将不起作用。因此，这将是我剩下的问题，data_counter在管理站点中使用导入功能时为每个实例自动分配。

否则，将在 excel 文件中手动进行分配。XD

def save(self, *args, **kwargs):
    data_counter = Item.objects.filter(location=self.location).aggregate(counter=Count('id'))['counter'] # Count existing instance with matching "location id" of the new instance
    if self.pk is None and self.property_number is None: # if new instance and property number field is blank
        if data_counter is None: # if data_counter is empty/none, no matching instance
            data_counter = 1  # start at 1
        else: # else, if there is matching instance
            data_counter += 1 # add 1 to the data_counter
    elif self.pk is not None and self.property_number is None: # if not new instance and property number field is blank, Update an instance without property number
        if data_counter is None: # if data_counter is empty/none, the existing instance has no matching location id, Update
            data_counter = 1 # Existing instance start at 1
        else: # else, if there is matching instance
            data_counter += 1 # add 1 to the data_counter

    # data_counter will be the series number for every location ID
    self.property_number = '{}-{}-{:04d}-{}'.format(self.date_acquired.year, self.sub_major_group_and_gl_account.sub_major_group_and_gl_account, data_counter, self.location.location_code)
    
    super(Item, self).save(*args, **kwargs)
于 2021-04-20T07:31:55.080 回答