Django:按照多对多的关系排序 [英] Django: order by field of many-to-many relation

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问题描述

给定django模型A和B:

  class A(models.Model):
things = models。 ManyToManyField('B')

class B(models.Model):
score = models.FloatField()
text = models.CharField(max_length = 100)

如何获取 A c c c c c

解决方案

如果我明白你的意思,应该这样做。 列表将包含由每个对象的最高得分内容的文本排序的模型A的所有对象的列表。

  dict = {} 
list = []
在A.objects.all()中:
dict [a] = a.things。 all()。order_by( - score)[0] .text
for k,v in sorted(dict.items(),key = lambda x:x [1]):
list。 append(k)

可能写一个更漂亮的方式,但是我不能想到一个在我头顶...


Given django models A and B:

class A(models.Model):
    things = models.ManyToManyField('B')

class B(models.Model):
    score = models.FloatField()
    text = models.CharField(max_length=100)

How do I get a list of A entities ordered by the text of the highest-scoring B in things?

解决方案

If I understand you correctly, this should do it. list will contain a list of all the objects of model A sorted by the text of each object's highest scoring thing.

dict = {}
list = []
for a in A.objects.all():
    dict[a] = a.things.all().order_by("-score")[0].text
for k, v in sorted(dict.items(), key=lambda x: x[1]):
    list.append(k)

There might be a prettier way to write it, but I can't think of one off the top of my head...

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