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):
1 2 3 4 5 6 7 | ActiveRecord::Base.establish_connection( adapter: "mysql", host: "localhost", username: "myuser", password: "mypass", database: "somedatabase") |
Example for SQLite database:
1 2 3 4 | ActiveRecord::Base.establish_connection( adapter: "sqlite3", database: "path/to/dbfile") |
Also accepts keys as strings (for parsing from YAML for example):
1 2 3 4 | ActiveRecord::Base.establish_connection( "adapter" => "sqlite3", "database" => "path/to/dbfile") |
Or a URL:
1 2 3 |
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:
1 | ActiveRecord::Base.establish_connection(:production) |
The exceptions AdapterNotSpecified, AdapterNotFound and ArgumentError may be returned on an error.
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