更新Django-Select2 2 AutoModelSelect2Field的查询集

Question

我不知道如何动态更新AutoModelSelect2Field的查询集。我得到的结果很奇怪。例如，有时select2框将返回正确的过滤结果，有时当我输入相同的字符时它将不返回任何结果。

我的代码：

#views.py
form = MyForm()


#forms.py
class MyField(AutoModelSelect2Field):
    search_fields = ['name__icontains']
    max_results = 10


class MyForm(forms.Form):
    my_field = MyField(
        queryset=project.objects.none(),
        required=True,
        widget=AutoHeavySelect2Widget(
            select2_options={
                'width': '100%',
            }
        )
    )

    def __init__(self, *args, **kwargs):
        qs = kwargs.pop('queryset')
        self.base_fields['my_field'].queryset = qs
        super(MyForm, self).__init__(*args, **kwargs)
        #self.fields['my_field'].queryset = qs
        #self.base_fields['my_field'].queryset = qs

我试过的几件事-

意见中的最新情况：

#views.py
form = MyForm()
form.base_fields['my_field'].queryset = new_qs

以及：

form = MyForm()
form.fields['my_field'].queryset = new_qs

将qs传递给表单：

#views.py
form = MyForm(queryset=Project.objects.filter(project_type=pt))

# see above code for forms.py

我还尝试将初始qs设置为所有对象：

class MyForm(forms.Form):
    my_field = MyField(
        queryset=project.objects,
        ...

但我也遇到了同样的问题，90%的时间我得到了初始查询集的结果，而不是基于新qs的过滤对象。

Answer 1

我们找到了一种非常简单的方法，可以通过额外的字段来筛选下拉选项(即。首先选择国家，然后使州下拉菜单仅显示来自选定国家的州)

它受到了来自这里的一个建议的启发(我们也在这里发布了这个解决方案)：https://github.com/applegrew/django-select2/issues/22

在forms.py中：

class StateChoices(AutoModelSelect2Field):
    queryset = State.objects
    def get_results(self, request, term, page, context):
        country =  request.GET.get('country', '')

        states = State.objects.filter(country=country, name__istartswith=term)
        s2_results = [(s.id, s.name, {}) for s in states]

        return ('nil', False, s2_results)

表单字段：

# only include this when you would have a screen where the country 
# is preset and would not change, but you want to use it as a search context
country = forms.ModelChoiceField(queryset=Country.objects.all(),
                                 widget=forms.HiddenInput())
state = StateChoices(widget = AutoHeavySelect2Widget(
    select2_options = {
        'minimumInputLength': 1,
        'ajax': {
            'dataType': 'json',
            'quietMillis': 100,
            'data': JSFunctionInContext('s2_state_param_gen'),
            'results': JSFunctionInContext('django_select2.process_results'),
        }
    }))

在我们的javascript中：

function s2_state_param_gen(term, page) {
    var proxFunc = $.proxy(django_select2.get_url_params, this);
    results = proxFunc(term, page, 's2_condition_param_gen');
    results.country = $('#id_country').val();
    return results;
}