问题描述
我有一个应用程序的多个模型,其中包含为不同公司生成表单的选项。我正在使用 MysqL。另外,我是菜鸟 :(
FSForm 是主窗体。每当它生成时,它都会从“公司”对象中获取它的“fskey”(某些逻辑决定了要选择两个键中的哪一个)。
表单可以有很多“FSRows”。 Django 确定为“FSForm”选择和填充哪些行,如下所示。
检索与表单的“fskey”相关的“FSKeyRow”对象。然后,这些对象中相应的“FSRows”被填充为该表单的“FSDataPoint”模型的对象。
以下是我的模型:
class Company(models.Model):
"""Represents all companies"""
symbol = models.CharField(max_length=5)
name = models.CharField(max_length=255)
annual_fskey = models.ForeignKey("FSKey",on_delete=models.CASCADE,related_name="company_annual_key")
qtr_fskey = models.ForeignKey("FSKey",related_name="company_qtr_key")
class FSForm(models.Model):
"""Represents all forms"""
company = models.ForeignKey("Company",related_name="company_fsform")
functional_currency = models.ForeignKey("Currency",related_name="fsform_currency")
fskey = models.ForeignKey("FSKey",related_name="fsform_key")
class FSKey(models.Model):
"""Represents keys which determine the rows to populate in the FSForm"""
name = models.CharField(max_length=100)
comments = models.TextField(max_length=500,blank=True)
create_date = models.DateTimeField(auto_Now_add=True)
update_date = models.DateTimeField(auto_Now=True)
class FSRow(models.Model):
"""Represents all possible rows"""
name = models.CharField(max_length=255)
comments = models.TextField(max_length=500,blank=True)
class FSKeyRow(models.Model):
"""Represents all rows that pertain to a key. This tells Django which rows to populate for an FSKey"""
key = models.ForeignKey("FSKey",related_name="fskey_key")
row = models.ForeignKey("FSRow",related_name="fskey_row")
ordering = models.IntegerField(default=0)
class FSDataPoint(models.Model):
"""Represents DataPoints of the form. These are generated when a form is created based on FSKey applied to that form."""
form = models.ForeignKey("FSForm",related_name="fsform_datapoint")
row = models.ForeignKey("FSRow",related_name="fsrow_datapoint")
float_data = models.FloatField(null=True,blank=True)
str_data = models.CharField(max_length=255,blank=True)
我需要按照 FSKeyRow 模型中“ORDERING”字段的顺序检索表单的“FSDataPoints”。我无法在 FSDataPoints 模型或 FSRows 模型中保留“排序”字段,因为每个 FSKey 的这些值可能随时更改,这必须影响所有相应的 FSDataPoint 对象。
我如何从 views.py 中按该顺序访问 FSDataPoints?越短/越简单越好。
解决方法
我想这应该可以解决问题:
FSDataPoint.objects.order_by('row__fskey_row__ordering').all()