[英]django-mptt model instance does not support indexing
I'm trying to implement a simple file browser app using django-mptt 我正在尝试使用django-mptt实现一个简单的文件浏览器应用程序
this is my models.py 这是我的models.py
class RootMPTT(MPTTModel):
name = models.CharField(max_length =255)
parent = TreeForeignKey('self',null=True,blank=True,related_name='children',db_index=True)
class Doc(models.Model):
file = models.FileField(upload_to=set_upload_path_MPTT)
belongs_to = models.ForeignKey(RootMPTT)
I'm trying to show the tree view in a html using the code from the tutorial section 我正在尝试使用教程部分中的代码以html形式显示树视图
{% load mptt_tags %}
<ul>
{% recursetree nodes %}
<li>
{{ node.name }}
{% if not node.is_leaf_node %}
<ul class="children">
{{ children }}
</ul>
{% endif %}
</li>
{% endrecursetree %}
</ul>
I'm getting the below error from django 我从Django得到以下错误
'RootMPTT' object does not support indexing
mainly because the 'nodes' variable is the below 主要是因为'nodes'变量是下面的
nodes = RootMPTT.objects.get(pk=casenum)
if i change it to 如果我将其更改为
nodes = RootMPTT.objects.all()
the html is rendered fine. html呈现良好。 but all I need is to get the descendants of a single node as opposed to all root nodes. 但是我所要做的就是获取单个节点的后代,而不是所有根节点。
i supposed i can get the children by getting the get_children
method and manually show them in the html. 我get_children
我可以通过获取get_children
方法来获取孩子,并在html中手动显示他们。 but would like to know if theres a method using recursetree 但想知道是否有使用递归树的方法
recursetree
takes a queryset or list of nodes, not a single node. recursetree
采用查询集或节点列表,而不是单个节点。 If you only want to show one tree, just make a queryset with only that tree in it: 如果您只想显示一棵树,则只需在其中设置一棵树的查询集即可:
nodes = RootMPTT.objects.get(pk=casenum).get_descendants(include_self=True)
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