[Puppet Users] Trying to set up a class parameter override.

[jeff.b]

I'm trying to set up some classes where there is a default action that is 
applied to everything in a base class.  And then have a subclass that can 
override the default action for specific resources.  I am using this blog 
post as 
inspiration: 
http://www.craigdunn.org/2011/09/puppet-parameterized-classes-vs-definitions/ 

I created a test case of what I'm trying to achieve but the part where I'm 
overriding the value does not seem to take effect.   Please let me know 
what I'm doing wrong.


class example_env ( $env = 'default' ) {
    # Set $env and do something with it
    notify {"Env: ${env}": }
    #file {...}
}

class example_setdefault {
   # Instantiate example_env class with default value
   class { example_env: }
}

class example_override inherits example_setdefault {
  # Override example_env class env param with new value
  Class["example_env"] { env => 'orverride'}
}

class example_base {
    # Base class that is included to just about everyone

    # Set default value
    include example_setdefault
}

class example_sub {
    # Sub class that includes base class
    include example_base

    # Override default value
    include example_override
}

node "example1" {
    # host with default config
    include example_base
}

node "example2" {
    # host with override config
    include example_sub
}

When you run this as example2 it still shows $env being 'default'.   Please 
let me know where I went wrong.  Thanks.

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