Query Strings #

A query string is indicated by the first ? in the URL. It is used to pass additional data to the server.

http://example.com/admin?true

Rails allows you to handle query strings in a similar way to dynamic segments: by making them accessible in the params hash.

Consider the following route:

get 'photos/:id', to: 'photos#show'

If the user agent sends an HTTP request to the photos/1?hue=10, the params hash will contain:

params = {
  id: 1,
  hue: 10,
  # ...
}

In the next lesson, we'll learn about adding constraints to dynamic segments.

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