django FieldError at /search/ Cannot resolve keyword 'searchkeyword' - django

Question

I am working thru the Practical Django Projects book and am stumped. The book is for an earlier version of Django. I am using v1.3.
The problem is in the view, at 'search_keyword_keyword__in...'
from django.contrib.flatpages.models import FlatPage
from django.shortcuts import render_to_response
def search(request):
query = request.GET.get('q', '')
keyword_results = results = []
if query:
keyword_results = FlatPage.objects.filter(searchkeyword__keyword__in=query.split()).distinct()
results = FlatPage.objects.filter(content__icontains=query)
return render_to_response('search/search.html',
{'query' : query,
'keyword_results': keyword_results,
'results' : results })
The models.py is
from django.contrib.flatpages.models import FlatPage
from django.db import models
class SearchKeyword(models.Model):
keyword = models.CharField(max_length=50)
page = models.ForeignKey(FlatPage)
def __unicode__(self):
return self.keyword
The full error is:
Cannot resolve keyword 'searchkeyword' into field. Choices are: content, enable_comments, id, registration_required, sites, template_name, title, url
Which I think are the options for FlatPages. It doesn't seem like the foreign key relationship is being found.
Any ideas what could be wrong or how to correctly do the lookup? Thanks.
Here is the admin.py in case it has some bearing:
from django.contrib.flatpages.admin import FlatPageAdmin
from django.contrib import admin
from cms.search.models import SearchKeyword
from django.contrib.flatpages.models import FlatPage
# Define an inline admin descriptor for SearchKeywords model
class SearchKeywordInline(admin.TabularInline):
model = SearchKeyword
# Define a FlatPageAdmin class
class ExtendedFlatPageAdmin(FlatPageAdmin):
inlines = [
SearchKeywordInline,
]
# Re-register FlatPageAdmin
admin.site.unregister(FlatPage)
admin.site.register(FlatPage, ExtendedFlatPageAdmin)

Answer 1

The reverse relationship for your ForeignKey would be named searchkeyword_set (see https://docs.djangoproject.com/en/dev/topics/db/queries/#backwards-related-objects), so your queryset should have searchkeyword_set__keyword__in as a a parameter (or you can use related_name.
If that didn't work, you should check that you have done manage.py syncdb ?

Answer 2

It seems the problem was:
from django.contrib.flatpages.models import FlatPage
from django.db import models
The models needs to come first, like:
from django.db import models
from django.contrib.flatpages.models import FlatPage
I think what was happening is the FlatPage instance was being created before the ForeignKey was created, therefore the SearchKeyword attribute was not available to FlatPage.