如何更新对象但保留一些字段相同

Question

所以我正在制作一个更新表单，我希望允许用户更新他想要更新的字段，并让其余部分保持不变。但是django不会让他单独离开build_name字段而不进行任何更改，因为build_name是一个主键并且必须是唯一的。然而，对象本身触发了名称已经存在的事实。

Map<String, List<String>> map  = new Hashmap<>();
String currentTitle = null;

for(int i = 0; i<range.numCharacterRuns(); i++){

    CharacterRun cr = range.getCharacterRun(i);

    //if the cr is bold, add it as a title
    if(cr.isBold()){

        currentTitle = cr.text();
        map.put(currentTitle, new ArrayList<String>());

        }else{

            //if the cr is not bold, get the last inserted title and
            //add the cr to its String list

            List<String> list = map.get(currentTitle);

            if(list != null){

                list.add(cr.text());
                map.put(currentTitle, list);
           }

        }
}

这是create.html

def update(request, id):
title = 'Updating Build'
the_name = champBuild.objects.filter(pk=id).values_list('build_name', flat=True)

form  = champBuildUpdateForm(request.POST or None, initial={'build_name': str(the_name)[3:-2]})
if form.is_valid():
    champBuild.objects.filter(pk=id).update(build_name=form.cleaned_data.get('build_name'))
    return HttpResponseRedirect('/lolBuilds/detail/{}'.format(form.cleaned_data.get('build_name')))
context = {
    'title': title,
    'form': form
}
return render(request, 'lolBuilds/update.html', context) 

当我点击更新而不更改构建名称字段时会发生这种情况。