打印字段只與django中的foreignkey有關

Question

我想只打印與我的模型的外鍵關聯的條目。我有一系列的列表，我想打印列表名稱和屬於該列表的所有項目。我當前的問題是，每個列表都有一個div生成，這很好，但是與每個列表關聯的每個項目都在div內打印出來，而不僅僅是與listname關聯的項目。

查看

def control_panel(request, username): 

    context = RequestContext(request) 
    if username == request.user.username: 
     if request.user.is_authenticated(): 
      user = User.objects.get(username=username) 

      lists = request.user.newlist_set.all() 

      listitems = request.user.newlistitem_set.all().filter(list_name = lists) 

      return render_to_response('controlpanel.html', {'lists': lists,'listitems':listitems,}, context) 
     else: 
      return render_to_response('login.html', {}, context) 
    else: 
     return render_to_response('controlpanel.html', {}, context) 

模型

from django.db import models 
from django.contrib.auth.models import User 

class newlist(models.Model): 
    user = models.ForeignKey(User) 
    list_name = models.CharField(max_length = 100) 
    picture = models.ImageField(upload_to='profiles/', default = "") 

    def __str__(self): 
     return self.list_name 

class newlistitem(models.Model): 
    user = models.ForeignKey(User) 
    list_name = models.ForeignKey(newlist) 
    list_item = models.CharField(max_length = 200) 


    def __str__(self): 
     return self.list_item 

HTML

  {% for lista in lists %} <!-- This is a call to the lists that exist for eaach model taht s instantiates --> 

        <div id = "indivlistitem"> 


         <b>{{lista}}</b><br> <!-- This is the title of each list that is rendered to the HTML --> 

         {% for eachlistitem in listitems %} 

          {{eachlistitem}} 

         {%endfor%} 

        </div> 

       {% endfor %} 

Answer 1

據我所知，你不需要在你的情況下你的listItems中，具有newlists應該足夠了。您也可以訪問模板中的查詢，因此您可以直接在模板中訪問外鍵。像這樣：

{% for eachlistitem in lista.newlistitem_set.all %} 

。 這會給你列出所有有lista列表當前lista列表名稱

Answer 2

問題在於你的models.py中的listitems定義。具體而言，您將lists定義爲與給定用戶有關的所有列表，這很好，但是將與該用戶有關的每個列表（filter(list_name=lists）相關的每個列表項定義爲listitems，這是不好的。

由於請求上下文只是Python字典，並且可以被嵌套，我會做類似如下：

def control_panel(request, username): 

    context = RequestContext(request) 
    if username == request.user.username: 
     if request.user.is_authenticated(): 
      user = User.objects.get(username=username) 

      lists = request.user.newlist_set.all() 

      listitems = {} 
      for list in lists: 
       listitems[list.list_name] = request.user.newlistitem_set.filter(list_name=list) 

      return render_to_response('controlpanel.html', {'lists': lists,'listitems':listitems,}, context) 
     else: 
      return render_to_response('login.html', {}, context) 
    else: 
     return render_to_response('controlpanel.html', {}, context) 

這將創建一個字典，每個列表中的一個條目，然後你可以在渲染模板：

 {% for lista in lists %} <!-- This is a call to the lists that exist for eaach model taht s instantiates --> 

       <div id = "indivlistitem"> 


        <b>{{lista}}</b><br> <!-- This is the title of each list that is rendered to the HTML --> 

        {% for eachlistitem in listitems.{{lista.list_name}} %} 

         {{eachlistitem}} 

        {%endfor%} 

       </div> 

      {% endfor %}