... gth = 300 ) class Book ( models . Model ): name = models . CharField ( max_length = 300 ) pages = models . IntegerField () price = models . DecimalField ( max_digits = 10 , decimal_places = 2 ) rating = models . FloatField () authors = models . ManyTo ... books with publisher=BaloneyPress >>> Book . objects . filter ( publisher__name = "BaloneyPress" ) . count () 73 # Average price across all books, provide default to be returned instead # of None if no books exist. >>> from django.db.models import Avg ... >>> Book . objects . aggregate ( Avg ( "price" , default = 0 )) {'price__avg': 34.35} # Max price across all books, provide default to be returned instead of # None if ... ... gth = 300 ) class Book ( models . Model ): name = models . CharField ( max_length = 300 ) pages = models . IntegerField () price = models . DecimalField ( max_digits = 10 , decimal_places = 2 ) rating = models . FloatField () authors = models . ManyTo ... books with publisher=BaloneyPress >>> Book . objects . filter ( publisher__name = "BaloneyPress" ) . count () 73 # Average price across all books, provide default to be returned instead # of None if no books exist. >>> from django.db.models import Avg ... >>> Book . objects . aggregate ( Avg ( "price" , default = 0 )) {'price__avg': 34.35} # Max price across all books, provide default to be returned instead of # None if ... ... てみましょう: from django.db import models class Topping ( models . Model ): name = models . CharField ( max_length = 100 ) price = models . DecimalField ( decimal_places = 2 , max_digits = 6 ) def __str__ ( self ): return self . name class Pizza ( mod ... ey ( Topping , on_delete = models . CASCADE ) Select ウィジェットのサブクラスを使用して、各 <option> 要素の HTML 属性 data-price として Topping.price の値を含めることができます。 from django import forms class ToppingSelect ( forms . Select ): def cre ... per () . create_option ( name , value , label , selected , index , subindex , attrs ) if value : option [ "attrs" ][ "data-price" ] = value . instance . price return option class PizzaForm ( forms . ModelForm ): class Meta : model = Pizza fields = [ " ... ... てみましょう: from django.db import models class Topping ( models . Model ): name = models . CharField ( max_length = 100 ) price = models . DecimalField ( decimal_places = 2 , max_digits = 6 ) def __str__ ( self ): return self . name class Pizza ( mod ... ey ( Topping , on_delete = models . CASCADE ) Select ウィジェットのサブクラスを使用して、各 <option> 要素の HTML 属性 data-price として Topping.price の値を含めることができます。 from django import forms class ToppingSelect ( forms . Select ): def cre ... per () . create_option ( name , value , label , selected , index , subindex , attrs ) if value : option [ "attrs" ][ "data-price" ] = value . instance . price return option class PizzaForm ( forms . ModelForm ): class Meta : model = Pizza fields = [ " ... ... 写真を保存します: from django.db import models class Car ( models . Model ): name = models . CharField ( max_length = 255 ) price = models . DecimalField ( max_digits = 5 , decimal_places = 2 ) photo = models . ImageField ( upload_to = "cars" ) specs = ... ... 写真を保存します: from django.db import models class Car ( models . Model ): name = models . CharField ( max_length = 255 ) price = models . DecimalField ( max_digits = 5 , decimal_places = 2 ) photo = models . ImageField ( upload_to = "cars" ) specs = ... ... ブロック内で使うローカル変数に結びつける必要があります。たとえば、次のようにします: {% blocktranslate with amount = article.price %} That will cost $ {{ amount }} . {% endblocktranslate %} {% blocktranslate with myvar = value | filter %} This will have ... There are {{ counter }} {{ name }} objects. {% endblocktranslate %} より複雑な例: {% blocktranslate with amount = article.price count years = i.length %} That will cost $ {{ amount }} per year. {% plural %} That will cost $ {{ amount }} per {{ years ... ... ブロック内で使うローカル変数に結びつける必要があります。たとえば、次のようにします: {% blocktranslate with amount = article.price %} That will cost $ {{ amount }} . {% endblocktranslate %} {% blocktranslate with myvar = value | filter %} This will have ... There are {{ counter }} {{ name }} objects. {% endblocktranslate %} より複雑な例: {% blocktranslate with amount = article.price count years = i.length %} That will cost $ {{ amount }} per year. {% plural %} That will cost $ {{ amount }} per {{ years ... 2026年10月08日