$.get()在回调(?)上出现错误

Question

我知道有很多这样的问题，但我找不到解决问题的办法。

MyScript.js

$('#id_tags').keyup(function(){
    var query;
    query = $(this).val();
    $.get('/blog/suggest-category/', {suggestion: query}, function(data){
      console.log('data')
      $('#suggestion_div').html(data);
    });
  });

我的view.py

def get_category_list(max_results=0, starts_with=''):
    print('get_category_list')
    cat_list = []
    if starts_with:
        cat_list = Tag.objects.filter(slug__istartswith=starts_with)
    if max_results > 0:
        if len(cat_list) > max_results:
            cat_list = cat_list[:max_results]
    return cat_list


def suggest_category(request):
    print('suggest_category')
    cat_list = []
    starts_with = ''
    if request.method == 'GET':
        starts_with = request.GET['suggestion']
        cat_list = get_category_list(5, starts_with)
    print('cat_list', cat_list)
    #return render(request, 'blog/suggest_tag.html', {'suggestions': cat_list })
    return cat_list

query，在MyScript.js中是字符串。这个视图被调用(我可以读取print('cat_list', cat_list))，但是它会抛出一个错误：

当列表为空时，=>AttributeError: 'list' object has no attribute 'get'

什么时候不是(例如：cat_list [<Tag: Home>]) => ValueError: too many values to unpack (expected 2)

cat_list空跟踪错误：

cat_list []
Internal Server Error: /blog/suggest-category/
Traceback (most recent call last):
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\handlers\base.
py", line 235, in get_response
    response = middleware_method(request, response)
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\middleware\clickjac
king.py", line 31, in process_response
    if response.get('X-Frame-Options') is not None:
AttributeError: 'list' object has no attribute 'get'
[28/Dec/2017 16:25:08] "GET /blog/suggest-category/?suggestion= HTTP/1.1" 500 14
867

或者cat_list不为空：

cat_list [<Tag: Home>]
Internal Server Error: /blog/suggest-category/
Traceback (most recent call last):
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\handlers\base.
py", line 235, in get_response
    response = middleware_method(request, response)
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\middleware\clickjac
king.py", line 31, in process_response
    if response.get('X-Frame-Options') is not None:
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\query.py"
, line 378, in get
    clone = self.filter(*args, **kwargs)
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\query.py"
, line 790, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\query.py"
, line 808, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\sql\query
.py", line 1243, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\sql\query
.py", line 1269, in _add_q
    allow_joins=allow_joins, split_subq=split_subq,
  File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\sql\query
.py", line 1146, in build_filter
    arg, value = filter_expr
ValueError: too many values to unpack (expected 2)
[28/Dec/2017 16:08:23] "GET /blog/suggest-category/?suggestion=h HTTP/1.1" 500 1
5797

也许可以帮助标记模型，它来自于taggit：

@python_2_unicode_compatible
class TagBase(models.Model):
    name = models.CharField(verbose_name=_('Name'), unique=True, max_length=100)
    slug = models.SlugField(verbose_name=_('Slug'), unique=True, max_length=100)

    def __str__(self):
        return self.name

    class Meta:
        abstract = True

    def save(self, *args, **kwargs):
        if not self.pk and not self.slug:
            self.slug = self.slugify(self.name)
            from django.db import router
            using = kwargs.get("using") or router.db_for_write(
                type(self), instance=self)
            # Make sure we write to the same db for all attempted writes,
            # with a multi-master setup, theoretically we could try to
            # write and rollback on different DBs
            kwargs["using"] = using
            # Be oportunistic and try to save the tag, this should work for
            # most cases ;)
            try:
                with atomic(using=using):
                    res = super(TagBase, self).save(*args, **kwargs)
                return res
            except IntegrityError:
                pass
            # Now try to find existing slugs with similar names
            slugs = set(
                self.__class__._default_manager
                .filter(slug__startswith=self.slug)
                .values_list('slug', flat=True)
            )
            i = 1
            while True:
                slug = self.slugify(self.name, i)
                if slug not in slugs:
                    self.slug = slug
                    # We purposely ignore concurrecny issues here for now.
                    # (That is, till we found a nice solution...)
                    return super(TagBase, self).save(*args, **kwargs)
                i += 1
        else:
            return super(TagBase, self).save(*args, **kwargs)

    def slugify(self, tag, i=None):
        slug = default_slugify(unidecode(tag))
        if i is not None:
            slug += "_%d" % i
        return slug


class Tag(TagBase):
    class Meta:
        verbose_name = _("Tag")
        verbose_name_plural = _("Tags")
        app_label = 'taggit'

编辑:我改变了我的view.py

def suggest_category(request):
    print('suggest_category')
    cat_list = []
    starts_with = ''
    if request.method == 'GET':
        starts_with = request.GET['suggestion']
        cat_list = get_category_list(5, starts_with)
    print('cat_list', cat_list)
    return render(request, 'blog/suggest_tag.html', {'suggestions': cat_list })

这是我的模板suggest_tag.html

{% load i18n %}

     <ul>
        {% if suggestions %}
            {% for c in suggestions %}
                <li>{{ c.name }}</li>
            {% endfor %}
        {% else %}
            <li>{% trans "There are no tag present." %}</li>
        {% endif %}
    </ul>

现在它写在我创建的一个部门(id='suggestion_div')中，这样它就足够工作了。

/edit

Answer 1

您的错误是由从您的视图返回一些不是HttpResponse的内容造成的。

从代码中还不清楚您想要发送到JavaScript的是什么，但是不管是什么，它都需要封装在HttpResponse或其中的一个子类中。也许你想序列化一个查询集？