Using the same method but get different result - django

Question

I use {extends 'xxx.html'} to make all templates have the same 'head' and 'tail', there's an user avatar area {{ avatar }} in head, but I use the same method to pass this avatar in every views, my index.html can't correctly show the avatar, but the other can, so I assume is something wrong with my index views.
Here's the index view:
def index(request):
if request.method == 'GET':
all_user = UserInfo.objects.all()
user = all_user.filter(username=request.user.username)
return render(request, 'index.html', {
"icon": user.icon,
"user": user.username,
})
And here's a part of views which could correctly show the avatar:
if request.user.is_authenticated():
my_fav = UserFavorite.objects.all()
my_fav_num = my_fav.filter(user=request.user).count()
my_posts_num = all_posts.filter(user=request.user).count()
my_msg = UserMessage.objects.all()
my_msg_num = my_msg.filter(user=request.user, has_read=False).count()
all_user = UserInfo.objects.all()
user = all_user.get(username=request.user.username)
return render(request, 'community.html', {
"all_posts": posts,
"post_num": post_num,
"animal_kind": animal_kind,
"post_kind": post_kind,
"sort": sort,
"my_fav_num": my_fav_num,
"my_posts_num": my_posts_num,
"my_msg_num": my_msg_num,
"icon": user.icon,
"user": user.username,
})
else:
my_fav_num = 0
my_msg_num = 0
my_posts_num = 0
return render(request, 'community.html', {
"all_posts": posts,
"post_num": post_num,
"animal_kind": animal_kind,
"post_kind": post_kind,
"sort": sort,
"my_fav_num": my_fav_num,
"my_posts_num": my_posts_num,
"my_msg_num": my_msg_num,
})
HTML code:
<div class="head_bar" style="z-index: 1;">
<a class="logo" href="{% url 'index' %}">Nostray</a>
<div class="nav_bar">
<a class="nav" href="{% url 'adopt:market' %}"><span class="roll" id="adopt">领养</span></a>
<a class="nav" href="{% url 'community:allpost' %}"><span class="roll" id="community">社区</span></a>
<a class="nav" href=""><span class="roll" id="charity">公益</span></a>
</div>
{% if request.user.is_authenticated %}
<div class="current_user"><a href="">
<img src="{{ MEDIA_URL }}{{ icon }}" title="登录状态：{{ user }}" class="curr_icon">
</a></div>
{% else %}
<button class="bar_btn1" onclick="location.href={% url 'login' %}">登录</button>
<button class="bar_btn2" onclick="location.href={% url 'registe' %}">注册</button>
{% endif %}
can't see why the index can't find the avatar.

Answer 1

In your index you have list of user but in you 'correctly show' user is single object and it has the attrs, you need replace
user = all_user.filter(username=request.user.username)
on
user = all_user.get(username=request.user.username)
# ^^^^