javascript - 使用 setattr() 更新对象实例

Question

我有一个模型类，它有一个引用 django DB 对象的属性。我想使用带有 setattr() 的单个 View 来更改此属性，我用它来更改此对象的任何属性。

问题是，我似乎无法通过堆栈传递对象实例。我不确定是否可以使用 setattr() 来实现此目的。实际上，我什至不确定问题是否出在我尝试使用 setattr() 或其他方面 - 请让我知道!

POST 尝试时出错:

ValueError at /dollhouseupdate/1
Cannot assign "u'Citadel'": "Dollhouse.dh_background" must be a "Background" instance.

型号:

class Dollhouse(models.Model):
    dollhouse_name = models.CharField(max_length=100)
    user = models.ForeignKey(User)
    dh_background = models.ForeignKey(Background)
    def __str__(self):
        return self.dollhouse_name

模板:

    <select id="background-select">
      <option value="null">Change Background</option>
        {% for background in background_objects %}
        <option value="{{ background }}">{{ background.bg_name }} </option>
        {% endfor %}
    </select>

查看:

def dollhouseupdate(request, dollhouseid):
    if request.method == 'POST':
        workingdollhouse = Dollhouse.objects.get(id=dollhouseid)
        if request.POST.get('erase') == "true":
            workingdollhouse.delete()
            return HttpResponse("Dollhouse deleted!")
        else:
            data = (request.POST).dict()
            for key, value in data.items():
                setattr(workingdollhouse, key, value)
            workingdollhouse.save()
            return HttpResponse("Dollhouse {} saved!".format(workingdollhouse.dollhouse_name))

Javascript:

//change dollhouse background
$("#background-select").change(function() {
    if($("#background-select").val() != null) {
        var dollhouseid = workingDollhouse;
        var dh_background = $("#background-select").val()
        console.log("changing background to " + dh_background);
        $.ajax("http://127.0.0.1:8000/dollhouseupdate/"+dollhouseid, {
            type: 'POST',
            data: {
                dh_background: dh_background,
            }
        })
        .done(function(response){
           console.log("The request is complete!");
           console.log(response);
           window.location = "http://127.0.0.1:8000/";
       })
       .fail(function() {
           console.log("Sorry, there was a problem!");
       })
    };
});

Answer 1

您正在 POST 变量中传递对象 ID，而不是实际对象本身(无论如何您都不能这样做)。要么更改以下部分

data: {
    dh_background: dh_background,
}

至

data: {
    dh_background_id: dh_background,
}

或者使用 View 代码中的 id 获取对象实例。