模板渲染快捷方式未显示任何结果

Question

I am trying to pass a variable from pymongo on my views.py to a template. I am not getting any errors but neither is my code being rendered to my template.

views.py:

    def getTheA(request):
       for x in mycol.aggregate([{"$unwind":"$tags"},{'$match': {'tags.tag.name':'A A',}},{'$project': {'url': 1, 'AR': 1, 'tags.tag.name': 1, 'tags.variables': 1, '_id': 0}},]):
           theURLs = x['url']
           theNames = json.dumps(x['tags']['tag']['name'])
           theVars = json.dumps(x['tags']['variables'])
           context = {'theURLs' : theURLs}
       return render(request, 'templates/a.html', context)

My HTML code is pretty simple. I am just trying to print a list of the urls:

   <ul>
      <li><b>URLSSSS</h1></b>
      {% for theURL in theURLs %}
         <li>{{ theURL.theURLs }} </li>
      {% endfor %}
   </ul>

My result:

• URLSSSS

I am new to Django and MongoDb and can't seem to figure out where I went wrong.

Answer 1

When you have {{ xy }} in a template, that means "attribute or dictionary key y of object x ".

So, in your template, when you have {{ theURL.theURLs }} , that means "attribute or dictionary key theURLs of object theURL .

theURL is already looping over each object in theURLs . Do those objects really have attributes also named theURLs ? Nothing in your code suggests this is the case.

Answer 2

Okay after looking at your code for a long time, there are two main problems.

1. <li>{{ theURL.theURLs }}</li> should just be <li>{{ theURL }}</li>

2. Your for loop is seriously messed up. In its current form, you only take the last URL that you iterate over. Fix it in this way:

   def getTheA(request): theURLs = [] for yadayadayada: theURLs.append(x['url']) theNames = json.dumps(x['tags']['tag']['name']) theVars = json.dumps(x['tags']['variables']) context = { 'theURLs' : theURLs } return render(request, 'templates/a.html', context=context)