haystack.Exceptions.SearchBackendError: Tidak ada bidang yang ditemukan di indeks_penelusuran mana pun. Harap perbaiki ini sebelum mencoba mencari

Saya mencoba mengimplementasikan Haystack dengan whoosh.

Saya terus mendapatkan kesalahan ini meskipun semuanya tampaknya sudah dikonfigurasi dengan baik. Saya mendapatkan kesalahan:

haystack.exceptions.SearchBackendError: No fields were found in any search_indexes. Please correct this before attempting to search.

...ketika saya mencoba melakukan ./manage.py rebuild_index

konfigurasi:

HAYSTACK_SITECONF = 'myproject'
HAYSTACK_SEARCH_ENGINE = 'whoosh'
HAYSTACK_WHOOSH_PATH = cwd + '/whoosh/mysite_index'

Ada direktori whoosh/mysite_index yang berhasil dibuat di folder root proyek saya.

*situs_pencarian.py*

import haystack
haystack.autodiscover()

*indeks_penelusuran.py*

from haystack.indexes import *
from haystack import site
from myproject.models import *

class ResearchersIndex(SearchIndex):
    text = CharField(document=True, use_template=True)
    name = CharFIeld(model_attr='name')

class SubjectIndex(SearchIndex):
    short_name = CharField(model_attr='short_name')
    name = CharField(model_attr='name')
    text = CharField(document=True, use_template=True)

class ResearchIndex(SearchIndex):
    text = CharField(document=True, use_template=True)
    abstract = TextField(model_attr='abstract')
    methodology = TextField(model_attr='methodology')
    year = IntegerField(model_attr='year')
    name = CharField(model_attr='name')


class Graph(SearchIndex):
    text = CharField(document=True, use_template=True)
    explanation = TextField(model_attr='explanation')
    type = CharField(model_attr='type')
    name = CharField(model_attr='name')

site.register(Researchers, ResearchersIndex)
site.register(Subject, SubjectIndex)
site.register(Research, ResearchIndex)
site.register(Graph, GraphIndex)

Terima kasih