如果不在数据库Djang上保存，则无法将临时数据添加到实例

Question

我有一套结果这个结果有一个喜欢 ManyToManyField属性，该属性存储所有具有相同结果的用户

我想归档的是在结果中添加一个额外的时间属性调用isLiked

因此，稍后在模板上，我可以向html添加一个数据属性，指示请求的用户已经喜欢了

我正在尝试用这种方法：

视图.py

def list_consequences(request, proponsal_id):
    try:

        consequences: [Consequence] = Consequence.objects.filter(of_proponsal=proponsal_id)

        user_likes =request.user.likes_consequences.get_queryset()

        union = consequences | user_likes

        for consequence in union:
            aux =consequences.get(pk=consequence.pk)
            aux.isLiked=True


        pros: Consequence = consequences.filter(efecto=Consecuencia.PRO)
        against: Consequence = consequences.filter(efecto=Consecuencia.AGAINST)

        template = loader.get_template('participation/consequences.html')


        context = {
            'pros': pros,
            'against': against,
            'is_user_authenticated': str(request.user.is_authenticated).lower(),
        }
        return HttpResponse(template.render(context, request))

    except Consequence.DoesNotExist:
        raise Http404("The consequence with id doesn't exist")

所以在模板后面我可以这样做：

后果.html

...
{% for pro  in pros %}
<button data-is-liked={{pro.isLiked}}> icon</button>
{% endfor %}
...

有人知道我怎么做吗

提前谢谢

Django版本：2.0

Python:3.6.5版

Answer 1

我终于这样解决了：

def _getConsequences(user: User, proponsal_id):
    consequences: [consequence] = Consequence.objects.filter(of_proponsal=proponsal_id)
    user_likes = user.like_consequence.get_queryset()
    pros: Consequence = consequences.filter(efect=Consecuencia.PRO)

    union = pros & user_likes
    pro_extra_data = []
    for pro in pros:
        if pro in union:
            pro.isLiked = True
        else:
            pro.isLiked = False
        pro_extra_data.append(pro)

    #... same procedure for contra_extra_data


    return pro_extra_data, contra_extra_data