[英]Django order_by price field with linked currency field
I have real estate model.我有房地产 model。 There are two fields price and currency .
有两个字段price和currency 。 People can enter real estate's price in two currency only.
人们只能以两种货币输入房地产价格。 However as price field is just numbers and prices are linked to currency, I can not order prices with different currency.
但是,由于价格字段只是数字并且价格与货币相关联,我无法订购不同货币的价格。 Only ordering with the same currency is possible.
只能使用相同的货币订购。
Only two currency options are available:只有两种货币可供选择:
UZS = 'UZS'
USD = 'USD'
CURRENCY_TYPES = (
(UZS, 'sum'),
(USD, 'y.e.')
)
class Property(BaseModel):
price = models.PositiveIntegerField()
currency = models.CharField(max_length=255, choices=CURRENCY_TYPES)
I tried to change prices to the same currency but then I don't know how to order them.我试图将价格更改为相同的货币,但后来我不知道如何订购它们。
Property.objects.filter(currency='UZS').annotate(divided_price=F('price') / 10000).values('divided_price')
So rate is所以率是
1 USD = 10 000 UZS 1 美元 = 10 000 乌兹别克斯坦
10 000 UZS = 1 USD 10 000 乌兹别克斯坦 = 1 美元
How to order prices with different currencies?如何订购不同货币的价格?
Use case expression for converting the prices to a common currency value.用于将价格转换为通用货币值的用例表达式。 For example
例如
from django.db.models import Case, When
#...
conversion_rate = 1 / 10_000 # This value can be from an exchange board
qs = Property.objects.annotate(
price_usd=Case(
When(currency=UZS, then=F('price') * conversion_rate ),
# Assumes that the only other currency is USD
default=F('price')
)
).order_by('price_usd')
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