Django 1.7+ default_permissions

Because do caption to do authority design. In the design of the core class need to do a good job of the basic design of authority. Django 1.7+ later django.db.modes new features default_permissions, official document vague.

decided to explore under their own, do not want to analyze the code, then introduce a bug, direct observation of the core line.

Introduce the Bug method:

Class Basemodel (models. Model):    # ...    . Class Meta:        default_permissions= ' Add ' #should be (' Add ', ' Change ',...)

The error is as follows:

Traceback (most recent): File "C:\Users\tommy.yu\Desktop\Captain\Captain-master\codes\Captain\manage.py", Line ten, in <module> execute_from_command_line (SYS.ARGV) File "C:\Python27\lib\site-packages\ django-1.7.2-py2.7.egg\django\core\management\__init__.py ", line 385, in Execute_from_command_line Utility.execute ( ) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\core\management\__init__.py", line 377, in Execute Self.fetch_command (subcommand). RUN_FROM_ARGV (SELF.ARGV) File "C:\Python27\lib\site-packages\ django-1.7.2-py2.7.egg\django\core\management\base.py ", line 288, in RUN_FROM_ARGV Self.execute (*args, **options.__ dict__) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\core\management\base.py", line 338, in Execute output = Self.handle (*args, **options) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\ core\management\commands\migrate.py ", line 165, in handle emit_post_migrate_signal (Created_modEls, Self.verbosity, self.interactive, Connection.alias) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg \django\core\management\sql.py ", line 268, in emit_post_migrate_signal using=db) File" C:\Python27\lib\site-packages\ django-1.7.2-py2.7.egg\django\dispatch\dispatcher.py ", line 198, in Send response = Receiver (signal=self, Sender=sende R, **named) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\contrib\auth\management\__init__.py ", line, in Create_permissions Permission.objects.using (using). Bulk_create (perms) File" C:\Python27\lib\site-pack ages\django-1.7.2-py2.7.egg\django\db\models\query.py ", line 409, in Bulk_create Self._batched_insert (objs_without_ PK, fields, batch_size) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\models\query.py", line 938, in _batched_insert using=self.db) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\models\ manager.py ", line, Manager_method return getattr (Self.get_queryset (), name) (*args, **kwargs) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django \db\models\query.py ", line 921, in _insert return Query.get_compiler (using=using). Execute_sql (return_id) File" C:\Pyth    on27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\models\sql\compiler.py ", line 920, in Execute_sql Cursor.execute (SQL, params) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\backends\ utils.py ", line Bayi, in Execute return super (Cursordebugwrapper, self). Execute (SQL, params) File" C:\Python27\lib\site- packages\django-1.7.2-py2.7.egg\django\db\backends\utils.py ", line +, in Execute return self.cursor.execute (SQL, params) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\utils.py", line 94, in __exit__ Six.rera Ise (Dj_exc_type, Dj_exc_value, Traceback) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\ backends\utils.py ", line +, in Execute return self.cursor.execute (SQL,params) File "C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\backends\sqlite3\base.py", line 486, In Execute return Database.Cursor.execute (self, query, params) django.db.utils.IntegrityError:columns content_type_id , codename is not unique

　　

Add print directly to the final file C:\Python27\lib\site-packages\django-1.7.2-py2.7.egg\django\db\backends\sqlite3\base.py Statements such as XXX. As follows:

    def execute (Self, query, Params=none):        If params was None:            return Database.Cursor.execute (self, query)        query = self.convert_query (query)        print query,params# adds the print        return Database.Cursor.execute (self, query , params)

Migrate again, and observe sql:

Select "Django_migrations". " App "," Django_migrations "." Name "from" Django_migrations "() Operations to perform:synchronize unmigrated apps:mptt Apply all migrations:admin, C  Ore, ContentTypes, auth, sessionssynchronizing apps without migrations:creating tables ...  Installing Custom SQL ... Installing indexes ... Running migrations:no migrations to apply. Select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' LogEntry ', ' admin ') select "Auth_permission". " content_type_id "," auth_permission "." Codename "from" Auth_permission "INNER joins" Django_content_type "On (" Auth_permission "." content_type_id "=" Django_content_type "." ID ") WHERE" Auth_permission "." Content_type_id "in (?) ORDER by "Django_content_type". " App_label "ASC," Django_content_type "." Model "ASC," auth_permission "." Codename "ASC (1,) Select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE" Django_content_type "." App_label "=? ORDER by "Django_content_type". " Name "ASC (' admin ')," select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' permission ', ' auth ') select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' group ', ' auth ') select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "DjaNgo_content_type "." App_label "=?) LIMIT (' user ', ' auth ') select "Auth_permission". " content_type_id "," auth_permission "." Codename "from" Auth_permission "INNER joins" Django_content_type "On (" Auth_permission "." content_type_id "=" Django_content_type "." ID ") WHERE" Auth_permission "." content_type_id "In (?,?,?) ORDER by "Django_content_type". " App_label "ASC," Django_content_type "." Model "ASC," auth_permission "." Codename "ASC (2, 3, 4) Select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE" Django_content_type "." App_label "=? ORDER by "Django_content_type". " Name "ASC (' auth ',) select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' contenttype ', ' contenttypes ') select "Auth_permission". "content_type_id "," auth_permission "." Codename "from" Auth_permission "INNER joins" Django_content_type "On (" Auth_permission "." content_type_id "=" Django_content_type "." ID ") WHERE" Auth_permission "." Content_type_id "in (?) ORDER by "Django_content_type". " App_label "ASC," Django_content_type "." Model "ASC," auth_permission "." Codename "ASC (5,) select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE" Django_content_type "." App_label "=? ORDER by "Django_content_type". " Name "ASC (' contenttypes ',) select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' Session ', ' Sessions ') select "Auth_permission". " content_type_id "," auth_permission "." Codename "from" Auth_permission "INNER JOIN" Django_content_Type "On (" Auth_permission ".") content_type_id "=" Django_content_type "." ID ") WHERE" Auth_permission "." Content_type_id "in (?) ORDER by "Django_content_type". " App_label "ASC," Django_content_type "." Model "ASC," auth_permission "." Codename "ASC (6,) select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE" Django_content_type "." App_label "=? ORDER by "Django_content_type". " Name "ASC (' Sessions ',) select" Django_content_type "." ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' tag ', ' Core ') select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_labEl "=?) LIMIT (' contenttype ', ' Core ') select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' menu ', ' Core ') select "Django_content_type". " ID "," django_content_type "." Name "," Django_content_type "." App_label "," Django_content_type "." Model "from" Django_content_type "WHERE (" Django_content_type "." Model "=? and "Django_content_type". " App_label "=?) LIMIT (' page ', ' Core ') select "Auth_permission". " content_type_id "," auth_permission "." Codename "from" Auth_permission "INNER joins" Django_content_type "On (" Auth_permission "." content_type_id "=" Django_content_type "." ID ") WHERE" Auth_permission "." content_type_id "in (?,?,?,?) ORDER by "Django_content_type". " App_label "ASC," Django_content_type "." Model "ASC," auth_permission "." Codename "ASC (8, 9, 7) INSERT into" Auth_permission "(" Name ","Content_type_id", "codename") select? As "name",? As "content_type_id",? As "codename" UNION all SELECT?,?,? UNION all SELECT?,?,? UNION all SELECT?,?,? UNION all SELECT?,?,? UNION all SELECT?,?,? UNION all SELECT?,?,? (U ' Can a page ', ten, ' A_page ', U ' can D page ', ten, ' D_page ', U ' can D page ', ten, ' d_page ', ' can_add_% (Class) s ', ' + ', ' add ', ' C An_change_% (Class) s ', ten, ' Change ', ' can_delete_% (Class) s ', ', ' delete ', ' can_read_% (Class) s ', ' ten, ' read ') Traceback ( Most recent call last):

　　

Django 1.7+ default_permissions