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== Methods and Actions ==
A controller is a Ruby class which inherits from ApplicationController and has methods just like any other class. Usually these methods correspond to actions in MVC, but they can just as well be helpful methods which can be called by actions. When your application receives a request, the routing will determine which controller and action to run. Then Rails creates an instance of that controller and runs the method corresponding to the action (the method with the same name as the action).
[source, ruby]
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class ClientsController < ApplicationController
# Actions are public methods
def new
end
# These methods are responsible for producing output
def edit
end
# Helper methods are private and can not be used as actions
private
def foo
end
end
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Private methods in a controller are also used as filters, which will be covered later in this guide.
As an example, if the user goes to `/clients/new` in your application to add a new client, Rails will create a ClientsController instance will be created and run the `new` method. Note that the empty method from the example above could work just fine because Rails will by default render the `new.html.erb` view unless the action says otherwise. The `new` method could make available to the view a `@client` instance variable by creating a new Client:
[source, ruby]
----------------------------------------------
def new
@client = Client.new
end
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The link:../layouts_and_rendering.html[Layouts & rendering guide] explains this in more detail.
ApplicationController inherits from ActionController::Base, which defines a number of helpful methods. This guide will cover some of these, but if you're curious to see what's in there, you can see all of them in the API documentation or in the source itself.
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