Django的查詢集指標

Question

我在想，如果在模型中使用的索引是可能的：

class Buildings(models.Model): 
    island = models.ForeignKey(Island) 
    townhall = models.IntegerField(default=1) 
    lumberjack = models.IntegerField(default=0) 
    stonequarry = models.IntegerField(default=0) 
    ironmine = models.IntegerField(default=0) 
    [...] 

a=Buildings.objects.get(somecondition) 
print a.townhall # 1 
a[1] +=1 
print a.townhall # 2 

目前，它拋出

"TypeError: 'Buildings' object is unindexable"

爲什麼我想這樣做的原因是，使用索引將簡化如下代碼的部分：

if queue.kind_id == 0: buildings.townhall += 1 
elif queue.kind_id == 1: buildings.lumberjack += 1 
elif queue.kind_id == 2: buildings.stonequarry += 1 
elif queue.kind_id == 3: buildings.ironmine += 1 
elif queue.kind_id == 4: buildings.factory += 1 
elif queue.kind_id == 5: buildings.shipyard += 1 
elif queue.kind_id == 6: buildings.university += 1 

對此：

buildings[queue.kind_id] +=1 

Answer 1

get()方法不返回查詢集，只返回模型類的單個實例/對象。如果您想要檢索多個對象（=查詢集），請改用filter()！

a=Buildings.objects.filter(...) 

我不知道你要使用的樵夫什麼，市政廳等，爲... 屬性，我認爲你可以這樣做：

buildings_list = ['townhall', 'lumberjack', ....] 
attr = buildings_list[queue.kind_id] 
setattr(buildings, attr, getattr(buildings, attr) + 1) 

但我不知道你是什麼正試圖做，如果你正在使用django的模型，他們的方式是...