models.py

class Tags(models.Model):
    name = models.CharField(max_length = 36, verbose_name = _(u'标签'))
    slug = models.SlugField(max_length = 50, verbose_name = _(u'标签url'), default = 'tags')
    num = models.PositiveIntegerField(verbose_name = _(u'标签排序'), default = 0)
    
    def __unicode__(self):
        return self.name
    
    class Meta:
        verbose_name_plural = u'标签名字'
        
    def get_absolute_url(self):
        return reverse('info:tags', kwargs = {'slug':self.slug})

forms.py

class CreateTopicForm(forms.ModelForm):
    tags = forms.ModelMultipleChoiceField(queryset=Tags.objects.all(), widget=forms.CheckboxSelectMultiple(), required=False)
    category = forms.ModelChoiceField(queryset=Category.objects.all(), widget=forms.RadioSelect(), initial={'headline': 'Initial headline'})
    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user',None)
        super(CreateTopicForm, self).__init__(*args, **kwargs)
    class Meta:
        model = Topic
        fields = ['title', 'category', 'body', 'tags',]

    def save(self, commit=True):
        inst = super(CreateTopicForm, self).save(commit = False)
        inst.author = self.user
        if commit:
            inst.save()
            self.save_m2m()
        return inst

views.py

import jieba
import jieba.posseg as pseg 
pctaglist = ['高兴', '你好', '上海', '抑郁症', '头晕']

@login_required
def create_info(request):
    if request.method == "POST":
        form = CreateTopicForm(request.POST, user=request.user)
        if form.is_valid():
            body = form.cleaned_data['body']
            t = form.save(commit=False)
            t.ip_user = request.META['REMOTE_ADDR']
            words = list(jieba.cut(body, cut_all = True))
            t = form.save()
            tags_list = []
            for word in words:
                if word in pctaglist:
                    tags_list.append(word)
                    t.tags.add(word)
                    #问题主要在这里， pctaglist 是在后台添加的 标签tags, #用jieba分词分析文章内容后得出来的词与这个后台添加的标签取交集。如果有就添加到这个文章的标签里！
                    #这里不知道怎么在这里添加，用t.tags.add(word) 出错:'decimal' codec can't encode characters in position 0-1: invalid decimal Unicode string
                    #要想实现 结巴分词，和现有的 tag 取交集后得出来的词怎么添加到文章的tags里?
            return HttpResponseRedirect(reverse('info:info_detail', kwargs={'pk':t.pk}))
    else:
        form = CreateTopicForm()
        tags_list = []
    return render(request, 'info/post.html', context = {'form':form, 'tags_list':tags_list})

问题主要在这里， pctaglist 是在后台添加的 标签tags,
用jieba分词分析文章内容后得出来的词与这个后台添加的标签取交集。如果有就添加到这个文章的标签里！
这里不知道怎么在这里添加，
用t.tags.add(word) 出错:'decimal' codec can't encode characters in position 0-1: invalid decimal Unicode string 我也觉得这里这样操作有问题.但是一时不知道怎么改.知识不够....

要想实现 结巴分词，和现有的 tag 取交集后得出来的词怎么添加到文章的tags里?
或者有其它的好办法实现这一步?

谢谢~