Django 从两个模型查询一个表

我有一份零件清单（型号1）和价格（型号2）。我想在django-tables2表中显示它们，以获得表中零件的历史价格：

型号。py:

class Parts(models.Model):
    name = models.CharField('Name', max_length=120, unique=True)

class Prices(models.Model):
    price = models.DecimalField("Price", decimal_places=2, max_digits=8)
    date = models.DateTimeField(default=timezone.now)
    part = models.ForeignKey(Parts, on_delete=models.CASCADE)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="prices_list", verbose_name="Price",)
    date = django_tables2.Column(accessor="dates_list", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="price", verbose_name="Price",)
    date = django_tables2.Column(accessor="date", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)  

表格。py:

class Parts(models.Model):
    name = models.CharField('Name', max_length=120, unique=True)

class Prices(models.Model):
    price = models.DecimalField("Price", decimal_places=2, max_digits=8)
    date = models.DateTimeField(default=timezone.now)
    part = models.ForeignKey(Parts, on_delete=models.CASCADE)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="prices_list", verbose_name="Price",)
    date = django_tables2.Column(accessor="dates_list", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="price", verbose_name="Price",)
    date = django_tables2.Column(accessor="date", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)  

我尝试从两个列表创建表，因为我认为文档会建议在模型中使用以下方法：

def dates_list(self):
    return [{"date": d.date} for d in Prices.objects.filter(part_id = self.id)]

def prices_list(self):
    return [{"price": p.price} for p in Prices.objects.filter(part_id = self.id)]

但最后我得到了django-tables2中的一个表，它只在一行中包含完整的日期和价格列表

如果一个方法创建一个价格查询集和一个日期查询集，这样我就可以将它用于django-tables2，那么这个方法看起来会怎么样

编辑解决方案：

class Parts(models.Model):
    name = models.CharField('Name', max_length=120, unique=True)

class Prices(models.Model):
    price = models.DecimalField("Price", decimal_places=2, max_digits=8)
    date = models.DateTimeField(default=timezone.now)
    part = models.ForeignKey(Parts, on_delete=models.CASCADE)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="prices_list", verbose_name="Price",)
    date = django_tables2.Column(accessor="dates_list", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="price", verbose_name="Price",)
    date = django_tables2.Column(accessor="date", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)  

视图.py

class PartTable(SingleTableView):
    model = Parts
    template_name = "gap/parts_detail.html"
    table_class = PartPriceHistoryTable   
    queryset = Parts.objects.annotate(date=F("prices__date"),
                                      price=F("prices__price")).order_by('price', 'date')

表格。py:

class Parts(models.Model):
    name = models.CharField('Name', max_length=120, unique=True)

class Prices(models.Model):
    price = models.DecimalField("Price", decimal_places=2, max_digits=8)
    date = models.DateTimeField(default=timezone.now)
    part = models.ForeignKey(Parts, on_delete=models.CASCADE)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="prices_list", verbose_name="Price",)
    date = django_tables2.Column(accessor="dates_list", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)

class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="price", verbose_name="Price",)
    date = django_tables2.Column(accessor="date", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)  

---

models.py保持上述状态

您可以尝试使用queryset对日期和价格的值进行注释，并通过表中的访问器访问它（或者不访问，只需定义与注释变量相同的字段名）。例如：

# table class
class PriceHistoryTable(django_tables2.Table):
    price = django_tables2.Column(accessor="price", verbose_name="Price",)
    date = django_tables2.Column(accessor="date", verbose_name="Date",)

    class Meta:
        model = Parts
        sequence = ("date",  "price",)

# example implementation
from django.db.models import F

queryset = Parts.objects.annotate(date=F('prices__date'), price=F('price__price')).order_by('parts', 'date')
table = PriceHistoryTable(queryset)

for item in table.as_values():
    print(item)

# view

class PartTable(SingleTableView):
    template_name = "gap/parts_detail.html"
    table_class = PartPriceHistoryTable
    table_pagination = {"per_page": 10}    
    queryset = Parts.objects.annotate(date=F("prices__date"), price=F("prices__price")).order_by('price', 'date')

---

您建议我如何在

models.py

中定义该方法？我需要一个方法

defprice（self）：…

在模型中通过访问器调用它，对吗？您不需要在模型中执行任何操作。注释应该在views.py中完成。该表现在显示的是正常的

零件
模型，而不是queryset:
类零件表（SingleTableView）：model=Parts template\u name=“gap/Parts\u detail.html”queryset=Parts.objects.annotate（date=F（“prices\u date”），price=F(“prices.\u price”））。order.\u by（'price'，'date'）table=PriceHistoryTable（（queryset））
。在元类中定义的选项，如
exlucde=（'id'），）
也被忽略。你能分享你的观点吗？我添加了我的views.py。