兩個django模型的交集？

我有兩個型號，我想找出值的公共集的IDS的基礎上兩個django模型的交集？

第一種模式：

from __future__ import unicode_literals 
from django.db import models 
from django.contrib.auth.models import User 

# WE ARE AT MODELS/UNIVERSITIES 

class Universities(models.Model): 
    id = models.IntegerField(db_column="id", max_length=11, help_text="") 
    name = models.CharField(db_column="name", max_length=255, help_text="") 
    abbreviation = models.CharField(db_column="abbreviation", max_length=255, help_text="") 
    address = models.CharField(db_column="address", max_length=255, help_text="") 
    status = models.BooleanField(db_column="status", default=False, help_text="") 
    createdAt = models.DateTimeField(db_column='createdAt', auto_now=True, help_text="") 
    modifiedAt = models.DateTimeField(db_column='modifiedAt', auto_now=True, help_text="") 
    updatedBy = models.ForeignKey(User,db_column="updatedBy",help_text="Logged in user updated by ......") 

    class Meta: 
     managed = False 
     get_latest_by = 'createdAt' 
     db_table = 'universities'

而其他型號：

from __future__ import unicode_literals 

from django.db import models 



class NewsUniversityMappings(models.Model): 
    id = models.IntegerField(db_column="id", max_length=11, help_text="") 
    newsMappingId = models.IntegerField(db_column='newsMappingId' ,max_length=11, help_text="") 
    universityId = models.IntegerField(db_column='universityId', max_length=11, help_text="") 
    createdAt = models.DateTimeField(db_column='createdAt', auto_now=True, help_text="") 

    class Meta: 
     managed = False 
     db_table = 'news_university_mappings'

現在，在我看來，我已經爲兩種模型創建了對象：

def add_promoter_news(request, mapping_id=None, news_virtual_id=None): 
    try: 
     university_all_list = Universities.objects.using("cms").all 
     published_university_list = NewsUniversityMappings.objects.using("cms").filter(newsMappingId=news_virtual_id).all()

我想找到在Universities模型和universityId的NewsUniversityMappings模型的基礎上的兩個模型的共同點。任何幫助，將不勝感激。在此先感謝

來源

2017-04-25 Abi Waqas

嗯，我不知道這是你想要的，但：

def add_promoter_news(request, mapping_id=None, news_virtual_id=None): 
    try: 
     # Get that queryset 
     published_university_list = NewsUniversityMappings.objects.using("cms").filter(newsMappingId=news_virtual_id).all() 
     # Get list of distinct universityIds 
     published_university_IDS_list = published_university_list.values_list('universityId',flat=True).distinct() 
     # Get queryset of all Universities 
     university_all_list = Universities.objects.using("cms").all() 
     # Get queryset of universities with ids on previous list 
     university_list = university_all_list.filter(id__in=published_university_IDS_list)

現在university_list你只有ID爲Universities，那是在universityId可變某處至少其中一個NewsUniversityMappings。是嗎？

來源

2017-04-25 10:20:14

這是我需要的，但在這裏university_list = university_all_list.filter（id__in = published_university_IDS_list）它顯示錯誤說'功能'對象沒有屬性'過濾器' –

正確，忘記在'university_all_list = Universities.objects.using（「 cms「）。all（）'，當然函數'all'沒有'filter'。嘗試編輯答案。 –

兩個django模型的交集？

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