# Django MPTT easyui
## 测试指令
按照MPTT的文档，先创建模型，然后添加数据from django.db import models
from mptt.models import MPTTModel, TreeForeignKey class Genre(MPTTModel): name = models.CharField(max_length=50, unique=True) parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True)#class MPTTMeta:
# order_insertion_by = ['name'] 注意把order_insertion_by 这里删除。因为在转json输出的时候，按照mptt的lft，id这两个排序。先清空数据库from myapp.models import Genre
Genre.objects.all().delete()创建树节点
from myapp.models import Genre
rock = Genre.objects.create(name="Rock") blues = Genre.objects.create(name="Blues") hr = Genre.objects.create(name="Hard Rock", parent=rock) pr = Genre.objects.create(name="Pop Rock", parent=rock) Genre.objects.create(name="Hard Rock1", parent=hr) Genre.objects.create(name="Hard Rock3", parent=hr) Genre.objects.create(name="Hard Rock2", parent=hr)## 直接显示mptt
def show_genres(request):
nodes = Genre.objects.all() #print(nodes) return render_to_response('genres.html', {'nodes': nodes})## mptt转json
[fastest way to create JSON to reflect a tree structure in Python / Django using mptt](http://stackoverflow.com/questions/12556268/fastest-way-to-create-json-to-reflect-a-tree-structure-in-python-django-using/12556693)按照stackflow上的做法，为了快速输出，需要mptt和cache相关的api。然而我这里并不需要快速，额外的要求是输出的顺序，即插入顺序。
def recursive_node_to_dict(node):result = {
'name': node.name, 'id': node.pk, #notice the use of node._cached_children instead of node.get_children() 'children' : [recursive_node_to_dict(c) for c in node.get_children().order_by('lft', 'id')] }return result
def mptt_json(subTrees):subRootDicts = []
for subTree in subTrees: subTree = recursive_node_to_dict(subTree) subRootDicts.append(subTree)jsonTree = json.dumps(subRootDicts, indent=4)
print(jsonTree) # optional clean up, remove the [ ] at the beginning and the end, its needed for D3.js # jsonTree = jsonTree[1:len(jsonTree)] # jsonTree = jsonTree[:len(jsonTree)-1] return jsonTreedef get_tree(request):
rootM = Genre.objects.order_by('lft', 'id').filter(level=0) json_data = mptt_json(rootM) # print(json_data) return HttpResponse(json_data,content_type="application/json")## easyui加载mptt的数据
<table id="tg" class="easyui-treegrid" title="TreeGrid ContextMenu" style="width:700px;height:250px"
data-options=" iconCls: 'icon-ok', rownumbers: true, animate: true, collapsible: true, fitColumns: true, url: '/demo/get_tree/', method: 'get', idField: 'id', treeField: 'name' "> <thead> <tr> <th data-options="field:'name',width:180">Task Name</th> </tr> </thead> </table>