Io non credo che ci sia qualsiasi luogo che appena li elenca, ma ho controllato ConnectionAdapaters del ActiveRecord. Tenere presente che le opzioni cambiano il database che si utilizza, ma questo è stato elencato all'interno dell'adattatore di connessione MySQL.
elenco di opzioni per MySQL
:host - Defaults to "localhost".
:port - Defaults to 3306.
:socket - Defaults to "/tmp/mysql.sock".
:username - Defaults to "root"
:password - Defaults to nothing.
:database - The name of the database. No default, must be provided.
:encoding - (Optional) Sets the client encoding by executing "SET NAMES <encoding>" after connection.
:reconnect - Defaults to false (See MySQL documentation: http://dev.mysql.com/doc/refman/5.7/en/auto-reconnect.html).
:strict - Defaults to true. Enable STRICT_ALL_TABLES. (See MySQL documentation: http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html)
:variables - (Optional) A hash session variables to send as SET @@SESSION.key = value on each database connection. Use the value +:default+ to set a variable to its DEFAULT value. (See MySQL documentation: http://dev.mysql.com/doc/refman/5.7/en/set-statement.html).
:sslca - Necessary to use MySQL with an SSL connection.
:sslkey - Necessary to use MySQL with an SSL connection.
:sslcert - Necessary to use MySQL with an SSL connection.
:sslcapath - Necessary to use MySQL with an SSL connection.
:sslcipher - Necessary to use MySQL with an SSL connection.
Il github per gli adattatori Rails ActiveRecord, https://github.com/rails/rails/tree/master/activerecord/lib/active_record/connection_adapters