Python 数据库和模型仍然存在，DJango出现编程错误

在过去的3天里，我一直试图使用url.py和views.py在浏览器上获取模型数据，但失败惨重，尽管我能够在json文件中获取数据库，但无法在浏览器上获取。这是错误日志[代码在这里]

型号.py

from __future__ import unicode_literals

from django.db import models


class Authors(models.Model):
    aid = models.AutoField(primary_key=True)
    aname = models.CharField(max_length=200, blank=True, null=True)
    adescription = models.CharField(max_length=8000, blank=True, null=True)


class Books(models.Model):
    bid = models.IntegerField(primary_key=True)
    bname = models.CharField(max_length=200, blank=True, null=True)
    bdescription = models.CharField(max_length=8000, blank=True, null=True)


class Bookauth(models.Model):
    bid = models.ForeignKey(Books, models.DO_NOTHING, db_column='bid', blank=True, null=True)
    aid = models.ForeignKey(Authors, models.DO_NOTHING, db_column='aid', blank=True, null=True)

from __future__ import unicode_literals

from django.shortcuts import render
import requests
from django.http import HttpResponse
from django.db import models
from .models import Books


import json
from django.core import serializers

def index(request):
    return HttpResponse("Hello, world. You're at the polls index.")


def getObject(request):
    all_books = Books.objects.all()
    html = serializers.serialize('json', all_books)
    return HttpResponse(html)
    #data = serializers.serialize("json", Books.objects.all())
    #return HttpResponse(data, mimetype='application/json')

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^non', views.index, name = 'index'),
    url(r'^auth', views.author_search, name = 'AuthSearch'),
    url(r'^book', views.getObject, name = 'Books')
]

视图.py

from __future__ import unicode_literals

from django.db import models


class Authors(models.Model):
    aid = models.AutoField(primary_key=True)
    aname = models.CharField(max_length=200, blank=True, null=True)
    adescription = models.CharField(max_length=8000, blank=True, null=True)


class Books(models.Model):
    bid = models.IntegerField(primary_key=True)
    bname = models.CharField(max_length=200, blank=True, null=True)
    bdescription = models.CharField(max_length=8000, blank=True, null=True)


class Bookauth(models.Model):
    bid = models.ForeignKey(Books, models.DO_NOTHING, db_column='bid', blank=True, null=True)
    aid = models.ForeignKey(Authors, models.DO_NOTHING, db_column='aid', blank=True, null=True)

from __future__ import unicode_literals

from django.shortcuts import render
import requests
from django.http import HttpResponse
from django.db import models
from .models import Books


import json
from django.core import serializers

def index(request):
    return HttpResponse("Hello, world. You're at the polls index.")


def getObject(request):
    all_books = Books.objects.all()
    html = serializers.serialize('json', all_books)
    return HttpResponse(html)
    #data = serializers.serialize("json", Books.objects.all())
    #return HttpResponse(data, mimetype='application/json')

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^non', views.index, name = 'index'),
    url(r'^auth', views.author_search, name = 'AuthSearch'),
    url(r'^book', views.getObject, name = 'Books')
]

url.py

from __future__ import unicode_literals

from django.db import models


class Authors(models.Model):
    aid = models.AutoField(primary_key=True)
    aname = models.CharField(max_length=200, blank=True, null=True)
    adescription = models.CharField(max_length=8000, blank=True, null=True)


class Books(models.Model):
    bid = models.IntegerField(primary_key=True)
    bname = models.CharField(max_length=200, blank=True, null=True)
    bdescription = models.CharField(max_length=8000, blank=True, null=True)


class Bookauth(models.Model):
    bid = models.ForeignKey(Books, models.DO_NOTHING, db_column='bid', blank=True, null=True)
    aid = models.ForeignKey(Authors, models.DO_NOTHING, db_column='aid', blank=True, null=True)

from __future__ import unicode_literals

from django.shortcuts import render
import requests
from django.http import HttpResponse
from django.db import models
from .models import Books


import json
from django.core import serializers

def index(request):
    return HttpResponse("Hello, world. You're at the polls index.")


def getObject(request):
    all_books = Books.objects.all()
    html = serializers.serialize('json', all_books)
    return HttpResponse(html)
    #data = serializers.serialize("json", Books.objects.all())
    #return HttpResponse(data, mimetype='application/json')

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^non', views.index, name = 'index'),
    url(r'^auth', views.author_search, name = 'AuthSearch'),
    url(r'^book', views.getObject, name = 'Books')
]

---

将模型更改为此，然后进行迁移，然后进行迁移，然后在浏览器中签入

from __future__ import unicode_literals

from django.db import models


class Authors(models.Model):
    aid = models.AutoField(primary_key=True)
    aname = models.CharField(max_length=200, blank=True, null=True)
    adescription = models.TextField( blank=True, null=True)


class Books(models.Model):
    bid = models.IntegerField(primary_key=True)
    bname = models.CharField(max_length=200, blank=True, null=True)
    bdescription = models.TextField(blank=True, null=True)


class Bookauth(models.Model):
    bid = models.ForeignKey(Books, on_delete=models.DO_NOTHING, db_column='bid', blank=True, null=True)
    aid = models.ForeignKey(Authors, on_delete=models.DO_NOTHING, db_column='aid', blank=True, null=True)

---

当您运行manage.py migrate时会发生什么情况？@DanielRoseman我的数据库也出现了错误，就像我在模型中更改了字段，但在MySql数据库中没有更改，但现在可以工作了！您能告诉我您更改了什么吗？您为CharField提供了8000个字符，但不正确，它可以容纳255个字符，因此我将其更改为TextField，其中可能包含大量字符，并且您在模型之前错过了_delete键。不执行任何操作