使用django-polymorphic创建许多对象

时间:2013-12-15 09:53:11

标签: python django django-models

我正在使用django-polymorphic并且拥有一个包含大约8个派生类的基类。除非我尝试一次创建多个对象,否则它的效果很好,在这种情况下性能非常差。我的代码如下所示:

class Parent(PolymorphicModel):
  ...
class DerivedA(Parent):
  ...
class DerivedB(Parent):
  ...

@transaction.commit_on_success
def create_objects()
  for model_class in (DerivedA, DerivedB...):
    instance = model_class(...)
    instance.save()

我也尝试使用Parent.objects.bulk_create,但这对于polymorphic-django不起作用,因为它只是创建基础对象而不是子对象。当我尝试使用每个子模型的bulk_create时,它会引发ValueError("Can't bulk create an inherited model")

是否有更有效的方法来创建许多多态对象?

1 个答案:

答案 0 :(得分:0)

这是在django admin

中实现的
models.py

class BuildScript(models.Model):
   fields ...bla bla

class POLY_BuildScript(BuildScript):
    class Meta:
        verbose_name = "POLY"
    fields...bla bla

admin.py

#just after the imports (func stands alone)
def save_with_parent_fields(obj):
    obj.build = obj.pbuild
    obj.branch = obj.pbranch
    return obj

class BuildScriptAdmin(admin.ModelAdmin):

    def save_model(self, request, obj, form, change):
        obj.executer = request.user.userprofile
        obj.save()

class POLY_BuildScriptAdmin(BuildScriptAdmin):    
    def save_model(self, request, obj, form, change):
        save_with_parent_fields(obj)
        obj.executer = request.user.userprofile
        obj.save()

来自func的返回obj在别处使用:) 享受