Django查詢從shell中運行，但不是dev服務器？在dev服務器中引發FieldError

Question

我一直在使用Django的ORM（django 1.3）進行wtf時刻處理。在開發服務器：

# in x.modules.training.models 
class Training(x.models.Base): 
    trainers = models.ManyToManyField(staff_models.Staff, related_name='trainings_taught') 
    people = models.ManyToManyField(x.models.Person, related_name='trainings_attended') 

# in any view 
from x.modules.staff.models import Staff 
from x.models import Person 

Staff.objects.filter(trainings_taught=12) 
# [<Staff: Staff object>] 

Person.objects.filter(trainings_attended=12) 
# FieldError: Cannot resolve keyword 'trainings_attended' into field. Choices are: address, comment, contact_for_farmers, email, farmer, first_name, id, last_name, mobile_number, modified_by, modified_timestamp, national_id, passport_number, region, version 

# Why would it work for one ManyToMany and not the other? 

而在一般的蟒蛇殼，（注意X是Python路徑上），無論什麼兩個導入線的順序，這兩個查詢運行得很好。

>>> from x.models import * 
>>> from x import modules 
>>> Person.objects.filter(trainings_attended=12) 
>>> modules.staff.models.Staff.objects.filter(trainings_taught=12) 

這怎麼可能？

Answer 1

如果您有任何繼承自Training Class的類，則必須保證所有related_name都不相同。所以你應該聲明它：

people = models.ManyToManyField(x.models.Person, related_name='%(app_label)s_%(class)s_trainings_attended')