Run-time database configuration

Sometimes the database connection settings are not known until run-time, whenthese values may be loaded from a configuration file or the environment. Inthese cases, you can defer the initialization of the database by specifyingNone as the database_name.

database = PostgresqlDatabase(None)  # Un-initialized database.
 
class SomeModel(Model):
    class Meta:
        database = database

If you try to connect or issue any queries while your database is uninitializedyou will get an exception:

>>> database.connect()
Exception: Error, database not properly initialized before opening connection

To initialize your database, call the init() method with thedatabase name and any additional keyword arguments:

database_name = input('What is the name of the db? ')
database.init(database_name, host='localhost', user='postgres')

For even more control over initializing your database, see the next section,Dynamically defining a database.