old_contents: from django.contrib import admin
  from website.models import Issue, Service, UserProfile, Bounty, Solution, Taker
  from django.contrib.auth.admin import UserAdmin
  from django.contrib.auth.models import User
  
  class ServiceAdmin(admin.ModelAdmin):
       list_display=[] 
       for x in Service._meta.get_all_field_names(): 
           list_display.append(str(x))
  
  class BountyAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Bounty._meta.get_all_field_names(): 
          if x not in "issue_id,user_id":
              list_display.append(str(x))
  
  class UserProfileAdmin(admin.ModelAdmin):
      list_display=('user','balance','payment_service', 'payment_service_email')
  
  class IssueAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Issue._meta.get_all_field_names(): 
          if x not in "service_id,winner_id":
              list_display.append(str(x))
      readonly_fields = ("created","modified")
  
  class TakerAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Taker._meta.get_all_field_names(): 
           list_display.append(str(x))
  
  admin.site.unregister(User)
  
  UserAdmin.list_display = ('id','username','email', 'first_name', 'last_name', 'is_active', 'date_joined', 'is_staff')
      
  admin.site.register(Issue, IssueAdmin)
  admin.site.register(Service, ServiceAdmin)
  admin.site.register(UserProfile, UserProfileAdmin)
  admin.site.register(Bounty, BountyAdmin)
  admin.site.register(User, UserAdmin)
  admin.site.register(Solution)
  admin.site.register(Taker, TakerAdmin)
new_contents: from django.contrib import admin
  from website.models import Issue, Service, UserProfile, Bounty, Solution, Taker
  from django.contrib.auth.admin import UserAdmin
  from django.contrib.auth.models import User
  
  class ServiceAdmin(admin.ModelAdmin):
       list_display=[] 
       for x in Service._meta.get_all_field_names(): 
           list_display.append(str(x))
  
  class BountyAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Bounty._meta.get_all_field_names(): 
          if x not in "issue_id,user_id":
              list_display.append(str(x))
  
  class UserProfileAdmin(admin.ModelAdmin):
      list_display=('user','balance','payment_service', 'payment_service_email')
  
  class IssueAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Issue._meta.get_all_field_names(): 
          if x not in "service_id,winner_id,taker,solution":
              list_display.append(str(x))
      readonly_fields = ("created","modified")
  
  class TakerAdmin(admin.ModelAdmin):
      list_display=[] 
      for x in Taker._meta.get_all_field_names(): 
           list_display.append(str(x))
  
  admin.site.unregister(User)
  
  UserAdmin.list_display = ('id','username','email', 'first_name', 'last_name', 'is_active', 'date_joined', 'is_staff')
      
  admin.site.register(Issue, IssueAdmin)
  admin.site.register(Service, ServiceAdmin)
  admin.site.register(UserProfile, UserProfileAdmin)
  admin.site.register(Bounty, BountyAdmin)
  admin.site.register(User, UserAdmin)
  admin.site.register(Solution)
  admin.site.register(Taker, TakerAdmin)
subject: fix for admin error AttributeError: Unable to lookup 'taker' on Issue or IssueAdmin