上的Python 3.4.1将Django 1.8高配车型:Django管理在线:select_related
class Product(models.Model):
name = models.CharField(max_length=255)
# some more fields here
def __str__(self):
return self.name
class PricedProduct(models.Model):
product = models.ForeignKey(Product, related_name='prices')
# some more fields here
def __str__(self):
return str(self.product)
class Coming(models.Model):
# some unimportant fields here
class ComingProducts(models.Model):
coming = models.ForeignKey(Coming)
priced_product = models.ForeignKey(PricedProduct)
# more unimportant fields
及以下admin.py:
class ComingProductsInline(ForeignKeyCacheMixin, admin.TabularInline):
model = ComingProducts
class ComingAdmin(admin.ModelAdmin):
inlines = [ComingProductsInline]
当然,我有多次的查询问题到数据库:我有一个查询列表中的每个项目和查询每一行。所以,有100个项目我得到100^2个查询。 我已经解决了每个查询的问题Caching queryset choices for ModelChoiceField or ModelMultipleChoiceField in a Django form 但我仍然有str方法的问题。我已尝试以下步骤:
1)加入到prefetch_related ComingAdmin:
def get_queryset(self, request):
return super(ComingAdmin, self).get_queryset(request). \
prefetch_related('products__product')
2)添加到select_related ComingProductInline:
def get_queryset(self, request):
return super(ComingProductsInline, self).get_queryset(request). \
select_related('priced_product__product')
3)定义定制形式用于在线和添加select_related到字段查询集:
class ComingProductsInline(ForeignKeyCacheMixin, admin.TabularInline):
model = ComingProducts
form = ComingProductsAdminForm
class ComingProductsAdminForm(ModelForm):
def __init__(self, *args, **kwargs):
super(ComingProductsAdminForm, self).__init__(args, kwargs)
self.fields['priced_product'].queryset = PricedProduct.objects.all(). \
select_related('product')
class Meta:
model = ComingProducts
fields = '__all__'
4)定义自定义表单集:
class ComingProductsInline(ForeignKeyCacheMixin, admin.TabularInline):
model = ComingProducts
formset = MyInlineFormset
class MyInlineFormset(BaseInlineFormSet):
def __init__(self, data=None, files=None, instance=None,
save_as_new=False, prefix=None, queryset=None, **kwargs):
super(MyInlineFormset, self).__init__(data, files, instance,
save_as_new, prefix, queryset, **kwargs)
self.queryset = ComingProducts.objects.all(). \
prefetch_related('priced_product__product')
5)不同的组合为以前的4种方法
并没有什么帮助:为PricedProduct STR的每一个呼叫使得Django的执行对产品表的查询。所有这些方法都是在stackoverflow中提到的,但他们处理了ModelAdmin,并没有帮助Inline。我错过了什么?
哦。这是一种生活救星。我有一个模型A,它有很多模型B的内联.B有三个m2m和两个fk关系。此外。模型翻译被使用。另外,Grappelli的自动完成功能也有所帮助。 – Aitvaras
不幸的是,它在Django 2.0中不起作用 – ramusus
是怎么回事?它看起来不像Django的相关代码已经改变 – noamk