ProgrammingError: relation « bla bla » n'existe pas, en essayant d'exécuter la migration spécifique et obtenir erreur

Question

Je reçois une erreur:

$ python manage.py migrate swsite 0023_hitcounter.py

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/usr/lib64/python2.7/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line 
    utility.execute() 
    File "/usr/lib64/python2.7/site-packages/django/core/management/__init__.py", line 345, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/usr/lib64/python2.7/site-packages/django/core/management/base.py", line 348, in run_from_argv 
    self.execute(*args, **cmd_options) 
    File "/usr/lib64/python2.7/site-packages/django/core/management/base.py", line 398, in execute 
    self.check() 
    File "/usr/lib64/python2.7/site-packages/django/core/management/base.py", line 426, in check 
    include_deployment_checks=include_deployment_checks, 
    File "/usr/lib64/python2.7/site-packages/django/core/checks/registry.py", line 75, in run_checks 
    new_errors = check(app_configs=app_configs) 
    File "/usr/lib64/python2.7/site-packages/django/core/checks/urls.py", line 13, in check_url_config 
    return check_resolver(resolver) 
    File "/usr/lib64/python2.7/site-packages/django/core/checks/urls.py", line 23, in check_resolver 
    for pattern in resolver.url_patterns: 
    File "/usr/lib64/python2.7/site-packages/django/utils/functional.py", line 33, in __get__ 
    res = instance.__dict__[self.name] = self.func(instance) 
    File "/usr/lib64/python2.7/site-packages/django/core/urlresolvers.py", line 417, in url_patterns 
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) 
    File "/usr/lib64/python2.7/site-packages/django/utils/functional.py", line 33, in __get__ 
    res = instance.__dict__[self.name] = self.func(instance) 
    File "/usr/lib64/python2.7/site-packages/django/core/urlresolvers.py", line 410, in urlconf_module 
    return import_module(self.urlconf_name) 
    File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module 
    __import__(name) 
    File "/var/www/swlab-website/mysite/urls.py", line 25, in <module> 
    url(r'^swsite/', include('swsite.urls')), 
    File "/usr/lib64/python2.7/site-packages/django/conf/urls/__init__.py", line 52, in include 
    urlconf_module = import_module(urlconf_module) 
    File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module 
    __import__(name) 
    File "/var/www/swlab-website/swsite/urls.py", line 2, in <module> 
    from . import views 
    File "/var/www/swlab-website/swsite/views.py", line 27, in <module> 
    class IndexView(generic.ListView): 
    File "/var/www/swlab-website/swsite/views.py", line 31, in IndexView 
    newhit = HitCounter.objects.create() 
    File "/usr/lib64/python2.7/site-packages/django/db/models/manager.py", line 122, in manager_method 
    return getattr(self.get_queryset(), name)(*args, **kwargs) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/query.py", line 401, in create 
    obj.save(force_insert=True, using=self.db) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/base.py", line 708, in save 
    force_update=force_update, update_fields=update_fields) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/base.py", line 736, in save_base 
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/base.py", line 820, in _save_table 
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/base.py", line 859, in _do_insert 
    using=using, raw=raw) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/manager.py", line 122, in manager_method 
    return getattr(self.get_queryset(), name)(*args, **kwargs) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/query.py", line 1039, in _insert 
    return query.get_compiler(using=using).execute_sql(return_id) 
    File "/usr/lib64/python2.7/site-packages/django/db/models/sql/compiler.py", line 1060, in execute_sql 
    cursor.execute(sql, params) 
    File "/usr/lib64/python2.7/site-packages/django/db/backends/utils.py", line 79, in execute 
    return super(CursorDebugWrapper, self).execute(sql, params) 
    File "/usr/lib64/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
    File "/usr/lib64/python2.7/site-packages/django/db/utils.py", line 95, in __exit__ 
    six.reraise(dj_exc_type, dj_exc_value, traceback) 
    File "/usr/lib64/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute 
    return self.cursor.execute(sql, params) 
django.db.utils.ProgrammingError: relation "swsite_hitcounter" does not exist 
LINE 1: INSERT INTO "swsite_hitcounter" ("date", "template_location"... 

Ceci est source de confusion pour moi, car il est spécifiquement essayer de construire la table swsite_hitcounter comme dans la migration suivante, je suis en train de plaisir:

# -*- coding: utf-8 -*- 
# Generated by Django 1.9.5 on 2017-07-05 15:56 
from __future__ import unicode_literals 

from django.db import migrations, models 


class Migration(migrations.Migration): 

    dependencies = [ 
     ('swsite', '0022_auto_20170307_1343'), 
    ] 

    operations = [ 
     migrations.CreateModel(
      name='HitCounter', 
      fields=[ 
       ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')), 
       ('date', models.DateTimeField(auto_now=True)), 
       ('template_location', models.TextField()), 
      ], 
     ), 
    ] 

Est-ce quelque chose peut-être de l'évier? C'est moi qui essaye d'exécuter cette migration sur ma boite de production, ça fonctionnait bien (bien sur) sur ma boite de développement. Peut-être parce que j'ai effectué une migration spécifique? :

python manage.py migrer swsite 0023_hitcounter.py

Bien que la course:

python manage.py showmigrations

me donne la même erreur? Je suppose que mes migrations sont désynchronisées mais ne sont pas capables d'afficher les migrations, je ne sais pas comment montrer celles qui n'ont pas été dans cette mise à jour (en production depuis gilab)

Answer 1

La traceback vous montre que l'erreur se produit dans IndexView. Vous essayez de créer des objets dans la base de données lors du chargement de la vue. Accéder à la base de données lorsque les vues se chargent comme ceci est une mauvaise idée, donc vous devriez probablement supprimer la ligne. En production, il vous donne l'erreur car il essaie de créer l'objet dans la base de données avant d'avoir appliqué la migration qui crée la table.