I have a list named "posts" that comprises of objects like below.

```
{_id: "559301710de9c23407b237ee"
author: {user_id: "557c6922925a18a81930d2ce", username: "test"}
comment_id: []
content: "<p>123</p>"
created_at: "2015-06-30T20:52:01.738Z"
image_id: []
like_user_id: ["557c6922925a18a81930d2ce"]
likes: 1
tags: [{_id: "558ded1b8526b45407fd0bb1", tag_name: "1"}, {_id: "559301630de9c23407b237ec", tag_name: "2"},…]
title: "123"}

```

I want to extract tag\_name and show it in html

```
<a ng-repeat="post in bests" ng-href="/post/{{post._id}}">
  <em class="tag">{{post.tags.tag_name}}</em> //This appearently doesn't work!
  <span>{{post.title}}</span>
  <em class="likes">+{{post.likes}}</em>
  <time>{{post.created_at}}</time>
</a>

```

Everything works fine except for tag\_name.

I tried using ng-repeat inside ng-repeat and it doesn't seem to work. how do you do it?