如何动态加载 Django 类答案

【问题标题】：How to dynamically load a Django class如何动态加载 Django 类
【发布时间】：2015-09-04 21:00:10
【问题描述】：

从数据库中我有一个文本，它必须动态加载我的视图类。

我现在的例子是：

-projectname
    -appname
        -views.py
        -templates
            -appname
                -index.html

在views.py中

class SelectCampaign(View):

    def get(self, request, *args, **kwargs):

        campaign = Campaign.objects.values('campaign_name').filter(user=request.user)[0]

        #this is where I need you to automatically load with varying campaign
        generic_class = MyClassCampaignName1() 
        #example: generic_class = class called MyClassCampaignName1

        return generic_class.render_index(request)

class MyClassCampaignName1():

    def render_index(self, request, *args, **kwargs):
        return render(request, 'appname/index.html', {}, context_instance=RequestContext(request))

使数据库动态加载同名类的名称

【问题讨论】：

我认为这不是 django 特有的。如果不是，请查看stackoverflow.com/questions/1176136/…

标签： python django class load

【解决方案1】：

这里有几种方法可以从字符串名称中获取对象。我最喜欢getattr。

# outside.py
class OuterDummy():
    def __init__(self):
        print 'This is outer Dummy!'

# main.py
class InnerDummy():
    def __init__(self):
        print 'This is inner Dummy!'

if __name__ == "__main__":
    # Method 1) Use the globals object
    class_1 = globals().get('InnerDummy')
    instance_1 = class_1()
    # stdout: This is inner Dummy!

    # Method 2) Use getattr
    import outside
    class_2 = getattr(outside, 'OuterDummy')
    instance_2 = class_2()
    # stdout: This is outer Dummy!

python main.py

【讨论】：