title: Django: how to extends a view to another view without copy and paste?
body: <p>i have a view that shows my navigation bar, i am adding the navgigation bar dynamically from the database, but th problem is that i have to add that same piece of code to all my views for the navigation text to show up and that is making my code so length, is there a way to automatically extends the peice of code that is getting my navigation to all the views, so when i go to another page like the about page or contact, or profile page i can still see the navigation bar. Now only when i see the navigation bar is when i go to the index.html</p>
  <p>views.py</p>
  <pre><code>def index(request):
      designcatlist = DesignCategory.objects.all()
      prglangcatlist = ProgrammingLanguagesCategory.objects.all()
      howtocatlist = HowToCategory.objects.all()
      context = { ... }
  
  def about_page(request):
      designcatlist = DesignCategory.objects.all()
      prglangcatlist = ProgrammingLanguagesCategory.objects.all()
      howtocatlist = HowToCategory.objects.all()
      context = { ... }
  
  def contact_page(request):
      designcatlist = DesignCategory.objects.all()
      prglangcatlist = ProgrammingLanguagesCategory.objects.all()
      howtocatlist = HowToCategory.objects.all()
      context = { ... }
  
  def profile_page(request):
      designcatlist = DesignCategory.objects.all()
      prglangcatlist = ProgrammingLanguagesCategory.objects.all()
      howtocatlist = HowToCategory.objects.all()
      context = { ... }
  </code></pre>
  <p><strong>NOTE</strong>
  as you can see in the code above, i need to add the same piece of code for the naviation to show up on those pages.</p>