ジャンゴ・MPTT番組「いいえ、そのようなコラム」

Question

私は、最新のnews.Iへの投稿は、このエラーを解決することはできません許可フォーラム実装するMPTTを使用：アプリ名を

：「news_comment.lftそのような列を」 news.Thisはmodels.pyである：

from django.db import models 
from mptt.models import MPTTModel, TreeForeignKey 

class News(models.Model): 
    .... 

class Comment(MPTTModel): 
    .... 
    news = models.ForeignKey(News,related_name='news', null=True) 
    parent = TreeForeignKey('self', null=True, blank=True, related_name='children', db_index=True) 

    class MPTTMeta: 
     order_insertion_by = ['created'] 

これはviews.py

def show_news(request,request_id): 
    news = News.objects.get(id=request_id) 
    comments = Comment.objects.filter(news=news) 

    return render( request, 
       'news.html', 
       {'news': news, 
       'comments': comments,}) 

これはnews.html

の一部であります

これは、エラーレポートです：

Environment: 


Request Method: GET 
Request URL: http://127.0.0.1:8000/news/4/ 

Django Version: 1.10.1 
Python Version: 3.5.2 
Installed Applications: 
['django.contrib.admin', 
'django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'news', 
'mptt'] 
Installed Middleware: 
['django.middleware.security.SecurityMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.common.CommonMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware', 
'django.middleware.clickjacking.XFrameOptionsMiddleware'] 


Template error: 
In template /home/sinoease/Desktop/ross/Project/NewsPortal/news/templates/news.html, error at line 11 
    no such column: news_comment.lft 
    1 : {% block title %}{{news.title}}{% endblock title %} 
    2 : 
    3 : {% block content %} 
    4 :  <div id='news_info'> 
    5 :   <h1>{{ news.title }}</h1> 
    6 :   <p>{{ news.created}}</p> 
    7 :   <p>{{ news.content}}</p> 
    8 :  </div> 
    9 :  <div id="comment_list"> 
    10 :   <h2>Comments</h2> 
    11 :   {% for comment in comments %} 
    12 :    {% if comment.replyto == null %} 
    13 :     <div class="comment_info"> 
    14 :     <div class="comment_content"> 
    15 :      comment info:{{comment.content}} 
    16 :     </div> 
    17 :     <div clss="comment_create"> 
    18 :      comment on: {{comment.created}} 
    19 :     </div> 
    20 :     <a href="{% url 'reply_comment' news.id comment.id %}"><button>Reply</button></a>     
    21 : 


Traceback: 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py" in execute 
    64.     return self.cursor.execute(sql, params) 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/sqlite3/base.py" in execute 
    337.   return Database.Cursor.execute(self, query, params) 

The above exception (no such column: news_comment.lft) was the direct cause of the following exception: 

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/exception.py" in inner 
    39.    response = get_response(request) 

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py" in _get_response 
    187.     response = self.process_exception_by_middleware(e, request) 

File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py" in _get_response 
    185.     response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "/home/sinoease/Desktop/ross/Project/NewsPortal/news/views.py" in show_news 
    17.     'comments': comments,}) 

File "/usr/local/lib/python3.5/dist-packages/django/shortcuts.py" in render 
    30.  content = loader.render_to_string(template_name, context, request, using=using) 

File "/usr/local/lib/python3.5/dist-packages/django/template/loader.py" in render_to_string 
    68.  return template.render(context, request) 

File "/usr/local/lib/python3.5/dist-packages/django/template/backends/django.py" in render 
    66.    return self.template.render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render 
    208.      return self._render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in _render 
    199.   return self.nodelist.render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render 
    994.     bit = node.render_annotated(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated 
    961.    return self.render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/loader_tags.py" in render 
    61.     result = self.nodelist.render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render 
    994.     bit = node.render_annotated(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/base.py" in render_annotated 
    961.    return self.render(context) 

File "/usr/local/lib/python3.5/dist-packages/django/template/defaulttags.py" in render 
    166.    len_values = len(values) 

File "/usr/local/lib/python3.5/dist-packages/django/db/models/query.py" in __len__ 
    238.   self._fetch_all() 

File "/usr/local/lib/python3.5/dist-packages/django/db/models/query.py" in _fetch_all 
    1087.    self._result_cache = list(self.iterator()) 

File "/usr/local/lib/python3.5/dist-packages/django/db/models/query.py" in __iter__ 
    54.   results = compiler.execute_sql() 

File "/usr/local/lib/python3.5/dist-packages/django/db/models/sql/compiler.py" in execute_sql 
    835.    cursor.execute(sql, params) 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py" in execute 
    79.    return super(CursorDebugWrapper, self).execute(sql, params) 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py" in execute 
    64.     return self.cursor.execute(sql, params) 

File "/usr/local/lib/python3.5/dist-packages/django/db/utils.py" in __exit__ 
    94.     six.reraise(dj_exc_type, dj_exc_value, traceback) 

File "/usr/local/lib/python3.5/dist-packages/django/utils/six.py" in reraise 
    685.    raise value.with_traceback(tb) 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/utils.py" in execute 
    64.     return self.cursor.execute(sql, params) 

File "/usr/local/lib/python3.5/dist-packages/django/db/backends/sqlite3/base.py" in execute 
    337.   return Database.Cursor.execute(self, query, params) 

Exception Type: OperationalError at /news/4/ 
Exception Value: no such column: news_comment.lft 

誰も私にこの問題を解決するためにどのようにいくつかのアイデアを与えることができ感謝〜

Answer 1

MPTTがそれを使用しているモデルにフィールドを追加する - 実行するのに十分なはず？私が覚えている限り、python manage.py makemigrations <your app> && python manage.py migrate。 MTPP Tutorialは、この部分にを記載しています。モデルをに設定してください。