establish_connection(spec = nil)
Instance Public methods
Establishes the connection to the database. Accepts a hash as input where
the :adapter
key must be specified with the name of a database
adapter (in lower-case) example for regular databases (MySQL, Postgresql,
etc):
ActiveRecord::Base.establish_connection( adapter: "mysql", host: "localhost", username: "myuser", password: "mypass", database: "somedatabase" )
Example for SQLite database:
ActiveRecord::Base.establish_connection( adapter: "sqlite3", database: "path/to/dbfile" )
Also accepts keys as strings (for parsing from YAML for example):
ActiveRecord::Base.establish_connection( "adapter" => "sqlite3", "database" => "path/to/dbfile" )
Or a URL:
ActiveRecord::Base.establish_connection( "postgres://myuser:mypass@localhost/somedatabase" )
In case ActiveRecord::Base.configurations
is set (Rails
automatically loads the contents of config/database.yml into it), a symbol
can also be given as argument, representing a key in the configuration
hash:
ActiveRecord::Base.establish_connection(:production)
The exceptions AdapterNotSpecified, AdapterNotFound and ArgumentError may be returned on an error.
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