Django 迁移错误：不要自动创建权限和内容类型

如何解决Django 迁移错误：不要自动创建权限和内容类型

我使用 django 1.8.7 和 python 2.7 。我有迁移问题。当我迁移我的模型时，权限和内容类型不会自动创建。 错误看起来像这样：

    Traceback (most recent call last):
    File "/home/mariocesar/Proyectos/Crowddeals/env/local/lib/python2.7/site- 
    packages/django/core/management/base.py",line 222,in run_from_argv
    self.execute(*args,**options.__dict__)
    File "/home/mariocesar/Proyectos/Crowddeals/env/local/lib/python2.7/site- 
    packages/django/core/management/base.py",line 252,in execute
    output = self.handle(*args,**options) File"/home/mariocesar/Proyectos/Crowddeals/crowddeals/core/management/commands/update_pe 
    rmissions.py",line 29,in handle
    create_permissions(app,get_models(),options.get('verbosity',0))
    File "/home/mariocesar/Proyectos/Crowddeals/env/local/lib/python2.7/site- 
    packages/django/contrib/auth/management/__init__.py",line 74,in create_permissions
    for perm in _get_all_permissions(klass._Meta,ctype):
    File "/home/mariocesar/Proyectos/Crowddeals/env/local/lib/python2.7/site- 
    packages/django/contrib/auth/management/__init__.py",line 28,in 
    _get_all_permissions
    _check_permission_clashing(custom,builtin,ctype)
    File "/home/mariocesar/Proyectos/Crowddeals/env/local/lib/python2.7/site- 
    packages/django/contrib/auth/management/__init__.py",line 49,in 
    _check_permission_clashing
    for codename,_name in custom:
    ValueError: too many values to unpack

当我像这样更改迁移文件时：

    # -*- coding: utf-8 -*-
    from __future__ import unicode_literals

    from django.contrib.auth.management import _get_builtin_permissions,_check_permission_clashing
    from django.db import migrations,models
    from django.conf import settings
    def _get_all_permissions(opts,ctype):
        """
        Returns (codename,name) for all permissions in the given opts.
        """
        builtin = _get_builtin_permissions(opts)
        custom = list(opts.permissions)

        if any(isinstance(el,basestring) for el in custom):
            custom = [custom]

        _check_permission_clashing(custom,ctype)
        return builtin + custom


    class Migration(migrations.Migration):

        dependencies = [
            migrations.swappable_dependency(settings.AUTH_USER_MODEL),]

        operations = [
            migrations.CreateModel(
                name='JsonModel',fields=[
                    ('id',models.AutoField(verbose_name='ID',serialize=False,auto_created=True,primary_key=True)),('data',models.CharField(max_length=1000000)),('generatedtime',models.DateTimeField(auto_Now_add=True,null=True)),('title',models.CharField(max_length=200,null=True,blank=True)),('type',models.IntegerField(default=0)),('user',models.ForeignKey(to=settings.AUTH_USER_MODEL)),],options={
                    'permissions': (('view_jsonmodel','Can view jsonmodel'),('view_jsonmodel_int','Can view jsonmodel_int')
                },),]

        def forwards(self,orm):
            from django.contrib.auth import management
            management._get_all_permissions = _get_all_permissions

并运行命令“python manage.py migrate” 这是回应：

        Operations to perform:
    Apply all migrations: (none)
    Running migrations:
    No migrations to apply.
    Your models have changes that are not yet reflected in a migration,and so won't be applied.
    Run 'manage.py makemigrations' to make new migrations,and then re-run 'manage.py migrate' to apply them.
    Traceback (most recent call last):
    File "manage.py",in <module>
        execute_from_command_line(sys.argv)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py",line 354,in execute_from_command_line
        utility.execute()
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py",line 346,in execute
        self.fetch_command(subcommand).run_from_argv(self.argv)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py",line 394,in run_from_argv
        self.execute(*args,**cmd_options)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py",line 445,in execute
        output = self.handle(*args,**options)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py",line 226,in handle
        emit_post_migrate_signal(created_models,self.verbosity,self.interactive,connection.alias)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/sql.py",line 280,in emit_post_migrate_signal
        using=db)
    File "/usr/local/lib/python2.7/dist-packages/django/dispatch/dispatcher.py",line 189,in send
        response = receiver(signal=self,sender=sender,**named)
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/management/__init__.py",line 84,in create_permissions
        for perm in _get_all_permissions(klass._Meta,ctype):
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/management/__init__.py",line 24,in _get_all_permissions
        _check_permission_clashing(custom,ctype)
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/management/__init__.py",line 47,in _check_permission_clashing
        for codename,_name in custom:

感谢您的帮助。 :)

解决方法

我找到了解决方案，在其他model.py应用程序中定义自定义权限时，我的同事定义了这样的自定义权限：

    class Meta:
    permissions = (
        ('view_log','Can view log'),('view_failedloginlog','Can view failed login log'),('view_loginlog','Can view login log'),('view_loginattempt','Can view login attempt'),('view_onlineusers','Can view online users')
    )

虽然，权限类型应该是 tupe；这意味着权限应该像这样定义：

    class Meta:
    permissions = (
        ('view_log','Can view online users'),)

这个“，”太重要了！！！ :))