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(Universal Resource Locator) This is an address, or tag which provides a way to identify and distinguish between which internet resource is needed. The beginning of the address indicates the type of resource: http: for Web pages, ftp: for file transfers or mailto: for e-mail addresses.
Manual page for Migrations
Nothing beats reading up on the source documentation for a particular class. Migrations are one of those powerful and perhaps underutilized features of Rails. I like to keep this man page within reach.