我想管理员发布名称，电子邮件和使用前端的用户的角色，其存储在后端的django，请注意，我不希望管理员存储密码，用户将稍后添加它.下面的代码是给错误400当我输入姓名，电子邮件和角色
djangocode：

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserAccount
        fields = ['email', 'name', 'username', 'password', 'role']
    
    def create(self, validated_data):
        password = validated_data('password')
        username = validated_data('username')

        user = UserAccount(
            email=validated_data['email'],
            role=validated_data['role'],
            name=validated_data['name']
        )
        
        if username is not None:
            username=validated_data['username'],
          
        if password is not None:
            user.set_password(validated_data['password'])
            
        user.save()
        return user

React代码：

const handleSubmit = (event) => {
   event.preventDefault();
    const data = {
      name : name,
      email : email,
      role: role
    };

   console.log("data is "+data);
   axios.post('http://127.0.0.1:8000/api/register/', data)
    .then(response => console.log("got it"+response.data))
    .catch(error => console.log(error));

    console.log('name:', name);
    console.log('email:', email);
    console.log('role:', role);