We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
use small images in user avatar in moderators list


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `euth/users/serializers.py`
Content:
```
1 from rest_framework import serializers
2 
3 from .models import User
4 
5 
6 class UserSerializer(serializers.ModelSerializer):
7     avatar = serializers.ImageField()
8 
9     class Meta:
10         model = User
11         fields = ('id', 'username', 'avatar', 'default_avatar')
12         read_only_fields = ('id', 'username', 'avatar', 'default_avatar')
13 
14 
15 # mails should not be exposed in API, so there is a separate one for this
16 class UserWithMailSerializer(UserSerializer):
17     class Meta(UserSerializer.Meta):
18         fields = ('id', 'username', 'avatar', 'default_avatar', 'email')
19         read_only_fields = ('id', 'username', 'avatar', 'default_avatar',
20                             'email')
21
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/euth/users/serializers.py b/euth/users/serializers.py
--- a/euth/users/serializers.py
+++ b/euth/users/serializers.py
@@ -1,16 +1,22 @@
+from easy_thumbnails.files import get_thumbnailer
 from rest_framework import serializers
 
 from .models import User
 
 
 class UserSerializer(serializers.ModelSerializer):
-    avatar = serializers.ImageField()
+    avatar = serializers.SerializerMethodField()
 
     class Meta:
         model = User
         fields = ('id', 'username', 'avatar', 'default_avatar')
         read_only_fields = ('id', 'username', 'avatar', 'default_avatar')
 
+    def get_avatar(self, obj):
+        if obj.avatar:
+            image = get_thumbnailer(obj.avatar)['avatar_small']
+            return image.url
+
 
 # mails should not be exposed in API, so there is a separate one for this
 class UserWithMailSerializer(UserSerializer):

{"golden_diff": "diff --git a/euth/users/serializers.py b/euth/users/serializers.py\n--- a/euth/users/serializers.py\n+++ b/euth/users/serializers.py\n@@ -1,16 +1,22 @@\n+from easy_thumbnails.files import get_thumbnailer\n from rest_framework import serializers\n \n from .models import User\n \n \n class UserSerializer(serializers.ModelSerializer):\n-    avatar = serializers.ImageField()\n+    avatar = serializers.SerializerMethodField()\n \n     class Meta:\n         model = User\n         fields = ('id', 'username', 'avatar', 'default_avatar')\n         read_only_fields = ('id', 'username', 'avatar', 'default_avatar')\n \n+    def get_avatar(self, obj):\n+        if obj.avatar:\n+            image = get_thumbnailer(obj.avatar)['avatar_small']\n+            return image.url\n+\n \n # mails should not be exposed in API, so there is a separate one for this\n class UserWithMailSerializer(UserSerializer):\n", "issue": "use small images in user avatar in moderators list\n\n", "before_files": [{"content": "from rest_framework import serializers\n\nfrom .models import User\n\n\nclass UserSerializer(serializers.ModelSerializer):\n    avatar = serializers.ImageField()\n\n    class Meta:\n        model = User\n        fields = ('id', 'username', 'avatar', 'default_avatar')\n        read_only_fields = ('id', 'username', 'avatar', 'default_avatar')\n\n\n# mails should not be exposed in API, so there is a separate one for this\nclass UserWithMailSerializer(UserSerializer):\n    class Meta(UserSerializer.Meta):\n        fields = ('id', 'username', 'avatar', 'default_avatar', 'email')\n        read_only_fields = ('id', 'username', 'avatar', 'default_avatar',\n                            'email')\n", "path": "euth/users/serializers.py"}], "after_files": [{"content": "from easy_thumbnails.files import get_thumbnailer\nfrom rest_framework import serializers\n\nfrom .models import User\n\n\nclass UserSerializer(serializers.ModelSerializer):\n    avatar = serializers.SerializerMethodField()\n\n    class Meta:\n        model = User\n        fields = ('id', 'username', 'avatar', 'default_avatar')\n        read_only_fields = ('id', 'username', 'avatar', 'default_avatar')\n\n    def get_avatar(self, obj):\n        if obj.avatar:\n            image = get_thumbnailer(obj.avatar)['avatar_small']\n            return image.url\n\n\n# mails should not be exposed in API, so there is a separate one for this\nclass UserWithMailSerializer(UserSerializer):\n    class Meta(UserSerializer.Meta):\n        fields = ('id', 'username', 'avatar', 'default_avatar', 'email')\n        read_only_fields = ('id', 'username', 'avatar', 'default_avatar',\n                            'email')\n", "path": "euth/users/serializers.py"}]}