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在我的模型,我得到這個:避免使用許多雙查詢到許多領域
Model(models.Model):
prices = models.ManyToManyField('Price')
def foo(self):
obj_prices = self.prices.all() # I expect save all prices in 'obj_prices'
fist_price = obj_prices[0] # I need the first price
for obj_price in obj_prices: # Also I need to check each price
// Do something
正如我評論我希望保存所有價格「obj_prices」,以防止多個查詢。但我用調試工具欄檢查了這一點,我得到了這個:
SELECT ••• FROM `app_model` ASC LIMIT 1
SELECT ••• FROM `app_model` ASC
任何想法?謝謝。