Django, psycopg2 und Datenbank nicht gefunden

Question

Ich habe vor kurzem (gestern) beschlossen, Django zu versuchen. Also folgte ich this guide

alles scheint gut zu funktionieren, bis ich diesen Befehl versucht:

python manage.py syncdb 

Ja ich weiß, syncdb ist depeciated so verwendet i wandern. und dann ist hier, was ich bekommen:

(project)dragmetohell@dmth:/opt/project/newproject$ python manage.py migrate 
Traceback (most recent call last): 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 199, in ensure_connection 
    self.connect() 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 171, in connect 
    self.connection = self.get_new_connection(conn_params) 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/postgresql/base.py", line 175, in get_new_connection 
    connection = Database.connect(**conn_params) 
    File "/opt/project/lib/python3.5/site-packages/psycopg2/__init__.py", line 164, in connect 
    conn = _connect(dsn, connection_factory=connection_factory, async=async) 
psycopg2.OperationalError: FATAL: database "/opt/project/newproject/demo_db" does not exist 


The above exception was the direct cause of the following exception: 

Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/opt/project/lib/python3.5/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line 
    utility.execute() 
    File "/opt/project/lib/python3.5/site-packages/django/core/management/__init__.py", line 345, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/opt/project/lib/python3.5/site-packages/django/core/management/base.py", line 348, in run_from_argv 
    self.execute(*args, **cmd_options) 
    File "/opt/project/lib/python3.5/site-packages/django/core/management/base.py", line 399, in execute 
    output = self.handle(*args, **options) 
    File "/opt/project/lib/python3.5/site-packages/django/core/management/commands/migrate.py", line 89, in handle 
    executor = MigrationExecutor(connection, self.migration_progress_callback) 
    File "/opt/project/lib/python3.5/site-packages/django/db/migrations/executor.py", line 20, in __init__ 
    self.loader = MigrationLoader(self.connection) 
    File "/opt/project/lib/python3.5/site-packages/django/db/migrations/loader.py", line 49, in __init__ 
    self.build_graph() 
    File "/opt/project/lib/python3.5/site-packages/django/db/migrations/loader.py", line 176, in build_graph 
    self.applied_migrations = recorder.applied_migrations() 
    File "/opt/project/lib/python3.5/site-packages/django/db/migrations/recorder.py", line 65, in applied_migrations 
    self.ensure_schema() 
    File "/opt/project/lib/python3.5/site-packages/django/db/migrations/recorder.py", line 52, in ensure_schema 
    if self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor()): 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 231, in cursor 
    cursor = self.make_debug_cursor(self._cursor()) 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 204, in _cursor 
    self.ensure_connection() 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 199, in ensure_connection 
    self.connect() 
    File "/opt/project/lib/python3.5/site-packages/django/db/utils.py", line 95, in __exit__ 
    six.reraise(dj_exc_type, dj_exc_value, traceback) 
    File "/opt/project/lib/python3.5/site-packages/django/utils/six.py", line 685, in reraise 
    raise value.with_traceback(tb) 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 199, in ensure_connection 
    self.connect() 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/base/base.py", line 171, in connect 
    self.connection = self.get_new_connection(conn_params) 
    File "/opt/project/lib/python3.5/site-packages/django/db/backends/postgresql/base.py", line 175, in get_new_connection 
    connection = Database.connect(**conn_params) 
    File "/opt/project/lib/python3.5/site-packages/psycopg2/__init__.py", line 164, in connect 
    conn = _connect(dsn, connection_factory=connection_factory, async=async) 
django.db.utils.OperationalError: FATAL: database "/opt/project/newproject/demo_db" does not exist 

hier ist, was ich verstehen: (oh, wirklich) psycopg2 tut meiner Datenbank zu finden. Ich kann Ihnen versichern, dass es vorhanden ist:

postgres=# \list 
            List of databases 
    Name | Owner | Encoding | Collate | Ctype | Access privileges  
-----------+-----------+----------+-------------+-------------+------------------------- 
demo_db | demo_user | UTF8  | en_US.UTF-8 | en_US.UTF-8 | =Tc/demo_user   + 
      |   |   |    |    | demo_user=CTc/demo_user 
postgres | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | 
template0 | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | =c/postgres   + 
      |   |   |    |    | postgres=CTc/postgres 
template1 | postgres | UTF8  | en_US.UTF-8 | en_US.UTF-8 | =c/postgres   + 
      |   |   |    |    | postgres=CTc/postgres 
(4 rows) 

Hier mein settings.py ist:

DATABASES = { 
    'default': { 
     'ENGINE': 'django.db.backends.postgresql_psycopg2', 
     'NAME': os.path.join(BASE_DIR, 'demo_db'), 
    'USER': 'demo_user', 
    'PASSWORD': 'XXXXXXXXXX', 
    'HOST': 'localhost', 
    'PORT':'', 
    } 
} 

(Ich habe gerade mit XXX Passwort ersetzt ...) (es sieht nicht so sicher , aber das ist ein anderes Problem)

ich im Internet einige Lösungen gesucht haben, und ich habe dies gefunden: Postgresql & psycopg2: database does not exist

und diese:

Creating a postgresql DB using psycopg2

Aber es hat mir nicht so viel helfen. Könntest du mir bitte helfen, zu verstehen, was hier vorgeht? Vielen Dank)))

Answer 1

Sie müssen nur den Namen der Datenbank in Ihre Einstellungen eingeben; nicht der Weg:

DATABASES = { 
    'default': { 
     'ENGINE': 'django.db.backends.postgresql_psycopg2', 
     'NAME': 'demo_db', 
     'USER': 'demo_user', 
     'PASSWORD': 'XXXXXXXXXX', 
     'HOST': 'localhost', 
     'PORT':'', 
    } 
} 

Answer 2

Sie sollten den Namen der Datenbank übergeben, nicht den Dateinamen.

DATABASES = { 
    'default': { 
     ... 
     'NAME': 'demo_db', 
     ... 
    } 
}