Нет такой ошибки столбца в модели Django

Question

Я добавляю новое поле в моей модели Django, но независимо от того, что новое поле, я не получаю не такую ​​ошибку столбца, когда я пытаюсь запустить makemigrations

File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py", line 318, in execute 
    return Database.Cursor.execute(self, query, params) 
django.db.utils.OperationalError: no such column: stats_control.con_LD_file 

Вот как выглядит мой код для модели сейчас. Если поля с комментариями раскомментированы, он не сможет выполнить вызов «makemigrations», как указано выше.

class Control(models.Model): 
    submissions = models.ManyToManyField(Submission, blank=True) 
    con_name = models.CharField('name', max_length=200) 
    con_bed_file = models.FileField('.bed file', upload_to='controls') 
    con_bim_file = models.FileField('.bim file', upload_to='controls') 
    con_fam_file = models.FileField('.fam file', upload_to='controls') 
    con_SNPs = models.IntegerField('# of SNPs', default = 0, blank=True, null=True) 
    #con_LD_file = models.FileField('LD score file', upload_to='LD_scores', blank=True, null=True) 
    def __unicode__(self):    # __unicode__ on Python 2 
     return self.con_name 

EDIT: вот некоторые другие вещи

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line 
    utility.execute() 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/core/management/__init__.py", line 312, in execute 
    django.setup() 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/__init__.py", line 18, in setup 
    apps.populate(settings.INSTALLED_APPS) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate 
    app_config.import_models(all_models) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models 
    self.models_module = import_module(models_module_name) 
    File "/Applications/Canopy.app/appdata/canopy-1.5.4.3105.macosx-x86_64/Canopy.app/Contents/lib/python2.7/importlib/__init__.py", line 37, in import_module 
    __import__(name) 
    File "/Users/hugokitano/Documents/Summer_Code/statread/stats/models.py", line 39, in <module> 
    class CompareForm(forms.Form): 
    File "/Users/hugokitano/Documents/Summer_Code/statread/stats/models.py", line 40, in CompareForm 
    select = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,required=False,choices=((x.id, x.con_name) for x in CONTROL_CHOICES))   
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/models/query.py", line 162, in __iter__ 
    self._fetch_all() 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/models/query.py", line 965, in _fetch_all 
    self._result_cache = list(self.iterator()) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/models/query.py", line 238, in iterator 
    results = compiler.execute_sql() 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 840, in execute_sql 
    cursor.execute(sql, params) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/backends/utils.py", line 79, in execute 
    return super(CursorDebugWrapper, self).execute(sql, params) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/utils.py", line 97, in __exit__ 
    six.reraise(dj_exc_type, dj_exc_value, traceback) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
    File "/Users/hugokitano/canopy/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py", line 318, in execute 
    return Database.Cursor.execute(self, query, params) 
django.db.utils.OperationalError: no such column: stats_control.con_LD_file 

Настройка:

Django settings for statread project. 

Generated by 'django-admin startproject' using Django 1.8.3. 

For more information on this file, see 
https://docs.djangoproject.com/en/1.8/topics/settings/ 

For the full list of settings and their values, see 
https://docs.djangoproject.com/en/1.8/ref/settings/ 
""" 

# Build paths inside the project like this: os.path.join(BASE_DIR, ...) 
import os 

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) 


# Quick-start development settings - unsuitable for production 
# See https://docs.djangoproject.com/en/1.8/howto/deployment/checklist/ 

# SECURITY WARNING: keep the secret key used in production secret! 
SECRET_KEY = 'igl9^f%j_3&2kk)iuo8lofz%3zzs$v!j+(-#tgl!^==il)k^yo' 

# SECURITY WARNING: don't run with debug turned on in production! 
DEBUG = True 

ALLOWED_HOSTS = [] 


# Application definition 

INSTALLED_APPS = (
    'django.contrib.admin', 
    'django.contrib.auth', 
    'django.contrib.contenttypes', 
    'django.contrib.sessions', 
    'django.contrib.messages', 
    'django.contrib.staticfiles', 
    'stats', 
) 

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware', 
    'django.middleware.common.CommonMiddleware', 
    'django.middleware.csrf.CsrfViewMiddleware', 
    'django.contrib.auth.middleware.AuthenticationMiddleware', 
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 
    'django.contrib.messages.middleware.MessageMiddleware', 
    'django.middleware.clickjacking.XFrameOptionsMiddleware', 
    'django.middleware.security.SecurityMiddleware', 
) 

ROOT_URLCONF = 'statread.urls' 

TEMPLATES = [ 
    { 
     'BACKEND': 'django.template.backends.django.DjangoTemplates', 
     'DIRS': [], 
     'APP_DIRS': True, 
     'OPTIONS': { 
      'context_processors': [ 
       'django.template.context_processors.debug', 
       'django.template.context_processors.request', 
       'django.contrib.auth.context_processors.auth', 
       'django.contrib.messages.context_processors.messages', 
      ], 
     }, 
    }, 
] 

WSGI_APPLICATION = 'statread.wsgi.application' 


# Database 
# https://docs.djangoproject.com/en/1.8/ref/settings/#databases 

DATABASES = { 
    'default': { 
     'ENGINE': 'django.db.backends.sqlite3', 
     'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), 
    } 
} 


# Internationalization 
# https://docs.djangoproject.com/en/1.8/topics/i18n/ 

LANGUAGE_CODE = 'en-us' 

TIME_ZONE = 'America/Los_Angeles' 

USE_I18N = True 

USE_L10N = True 

USE_TZ = True 


# Static files (CSS, JavaScript, Images) 
# https://docs.djangoproject.com/en/1.8/howto/static-files/ 

STATIC_URL = '/static/' 

MEDIA_ROOT = '/Users/hugokitano/Documents/Summer_Code/storage' 
MEDIA_URL = 'http://127.0.0.1:8000/stats/media/' 

модель:

from django.db import models 
from django import forms 
from django.forms import ModelForm 
from django.utils import timezone 
from picklefield.fields import PickledObjectField 
#from django.contrib.auth.models import User 

class Submission(models.Model): 
    sub_name = models.CharField(max_length=200) 
    sub_file = models.FileField(upload_to='statistics') 
    sub_date = models.DateTimeField('date submitted', blank=True, null=True, default=timezone.now) 
    def __unicode__(self):    # __unicode__ on Python 2 
     return self.sub_name 

class Output(models.Model): 
    submission = models.OneToOneField(Submission) 
    data = PickledObjectField() 
    outputFile = models.FileField('Output file', upload_to='outputs', blank = True, null = True) 
    numSNPs = models.IntegerField(default=0) 

class Control(models.Model): 
    submissions = models.ManyToManyField(Submission, blank=True) 
    con_name = models.CharField('name', max_length=200) 
    con_bed_file = models.FileField('.bed file', upload_to='controls') 
    con_bim_file = models.FileField('.bim file', upload_to='controls') 
    con_fam_file = models.FileField('.fam file', upload_to='controls') 
    con_SNPs = models.IntegerField('# of SNPs', default = 0, blank=True, null=True) 
    con_LD_file = models.FileField('LD score file', upload_to='LD_scores', blank=True, null=True) 
    def __unicode__(self):    # __unicode__ on Python 2 
     return self.con_name 

class SubmissionForm(ModelForm): 
    class Meta: 
     model = Submission 
     fields = ['sub_name', 'sub_file'] 

CONTROL_CHOICES = Control.objects.all() 

class CompareForm(forms.Form): 
    select = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,required=False,choices=((x.id, x.con_name) for x in CONTROL_CHOICES))   

class ControlForm(ModelForm): 
    class Meta: 
     model = Control 
     fields = ['con_name', 'con_bed_file', 'con_bim_file', 'con_fam_file'] 

Answer 1

Проблема здесь вы запрашивающая база данных, пока модели по-прежнему загружаются, а приложения не полностью инициализирован:

File "/Users/hugokitano/Documents/Summer_Code/statread/stats/models.py", line 40, in CompareForm 
select = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,required=False,choices=((x.id, x.con_name) for x in CONTROL_CHOICES))   

CONTROL_CHOICES является QuerySet определено ранее в файле:

CONTROL_CHOICES = Control.objects.all() 

Для простоты, никогда, никогда не делать этого. Если вы запрашиваете базу данных, пока ваши приложения не будут полностью загружены, все произойдет сбой.

Кроме того, ваш код не будет вести себя так, как ожидалось:

class CompareForm(forms.Form): 
    select = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,required=False,choices=((x.id, x.con_name) for x in CONTROL_CHOICES))   

Поскольку вы перебор на QuerySet непосредственно в определении формы, вы получите статический список элементов, которые никогда не меняются (даже если вы добавьте новые в базу данных), пока вы не перезапустите сервер.

Решение Здесь необходимо избавиться от forms.MultipleChoiceField и CONTROL_CHOICES и использовать ModelMultipleChoiceField. Он разработан специально для этого случая:

class CompareForm(forms.Form): 
    select = forms.ModelMultipleChoiceField(queryset=Control.objects.all()) 

Как QuerySet лениво оценивали, вы встаете к DASE объектов прямо из базы данных при отображении формы. Django также будет обрабатывать валидацию и все для вас.