DJANGO：如何使用包含多对多字段的模型输出CSV？

Question

我有一个“导出到CSV”按钮，导出所有车型。当我所有的汽车出口到CSV时，“特征”（如AM/FM收音机，天窗，真皮内饰，蓝牙，GPS等）列会显示如下所示：

[<Feature: GPS>, <Feature: Leather>] 

如何摆脱所有其他的东西，只有“GPS，皮革”？

MODEL

class Features(models.Model): 
    name = models.CharField(max_length=20) 
    def __unicode__(self): 
     return self.name 

class Car(models.Model): 
    model_name = models.CharField(max_length=20) 
    features = models.ManyToManyField(features) 
    def __unicode__(self): 
     return self.model_name 

VIEW.PY

def query(request): 
    results = Car.objects.all() 
    response = HttpResponse(mimetype='text/csv') 
    response['Content-Disposition'] = 'attachment;filename="car_export.csv"' 
    writer = csv.writer(response) 
    writer.writerow(['Model Name', 'Features']) 
    for x in results: 
     writer.writerow([x.model_name, x.role.all()]) 
     return response 

---

解答：

模型：

class Features(models.Model): 
    name = models.CharField(max_length=20) 
    def __unicode__(self): 
     return self.name 

class Car(models.Model): 
    model_name = models.CharField(max_length=20) 
    features = models.ManyToManyField(features) 
    def __unicode__(self): 
     return self.model_name 

浏览次数：

def query(request): 
    results = Car.objects.all() 
    response = HttpResponse(mimetype='text/csv') 
    response['Content-Disposition'] = 'attachment;filename="car_export.csv"' 
    writer = csv.writer(response) 
    writer.writerow(['Model Name', 'Features']) 
    for x in results: 
     writer.writerow([x.model_name, ', '.join([x.name for x in x.role.all()]),]) 
     return response 

Answer 1

取决于你想要在features模型打印什么领域...你正在寻找一个M2M经理 - 这是一个返回查询集接口的辅助工具。如果你希望所有相关的功能，你会想打电话x.features.all()

与特征模型的实际现场更换。

csv_features = ','.join([x.MY_FIELD_HERE for x in x.features.all()])