Support for environments in yaml files.

CHANGELOG

@@ -5,4 +5,10 @@
 * Packaged as a gem (but still works as a Rails plugin).
 * The app config object is now an instance of ApplicationConfiguration.
 * NoMethodError raised if you try to access a config element that doesn't exist.
-* ApplicationConfiguration#reload! to reread the config files and rebuild the app config object.
+* ApplicationConfiguration#reload! to reread the config files and rebuild the app config object.
+
+08/27/2009
+* Updated the ClosedStruct class.
+
+08/28/2009
+* Added support for "environments" in the YAML files.

README.rdoc

@@ -55,5 +55,35 @@ You just need to create an initializer that looks something like this.
 If you installed this as a Rails plugin instead of a gem, that code is already run for you in
 the plugin's init.rb.
 
+=== Environments
+
+Alternatively to splitting out your environments into separate files, you can just have a single file which defines
+the application configuration for all environments (much like how databases.yml works).  Note if you do this, nested
+configurations will not be recursively merged.  See example below.
+
+<em>app_config.yml</em>
+  defaults: &defaults
+    one: won
+    two: too
+    nested:
+      foo: foo
+      bar: bar
+
+  development:
+    <<: *defaults
+    two: new
+    nested:
+      foo: bar
+
+_code_
+  RAILS_ENV # => "development"
+  ::AppConfig = ApplicationConfiguration.new("app_config.yml")
+  AppConfig.use_environment!(RAILS_ENV)
+  AppConfig.one # => "won"
+  AppConfig.two # => "new"
+  AppConfig.nested.foo # => "bar"
+  AppConfig.nested.bar # raises NoMethodError because nested configurations are not recursively merged
+
+
 == Author
 Christopher J. Bottaro

lib/app_config.rb

@@ -25,6 +25,14 @@ def reload!
     @config = ClosedStruct.r_new(conf)
   end
 
+  def use_environment!(environment)
+    if @config.respond_to?(environment)
+      @config = @config.send(environment)
+    else
+      raise ArgumentError, "environment doesn't exist in app config: #{environment}"
+    end
+  end
+
 private
 
   def method_missing(name, *args)

test/app_config_test.rb

@@ -61,4 +61,18 @@ def test_reload
     assert_equal 1, config.size
   end
 
+  def test_environments
+    config = ApplicationConfiguration.new('test/environments.yml')
+    config.use_environment!("development")
+    assert_equal 2, config.size
+    assert_equal "google.com", config.server
+    assert_equal 6, config.computed
+    assert_equal 3, config.section.size
+    assert_equal "yahoo.com", config.section.servers[0].name
+    assert_equal "amazon.com", config.section.servers[1].name
+    assert_equal "webmaster@domain.com", config.emails.webmaster
+    assert_equal "feedback@domain.com", config.emails.feedback
+    assert_raise(NoMethodError){ config.emails.support }
+  end
+
 end

test/environments.yml

@@ -0,0 +1,17 @@
+defaults: &defaults
+  size: 1
+  server: google.com
+  emails:
+    support: support@domain.com
+    webmaster: web@domain.com
+
+development:
+  <<: *defaults
+  size: 2
+  computed: <%= 1 + 2 + 3 %>
+  section:
+    size: 3
+    servers: [ {name: yahoo.com}, {name: amazon.com} ]
+  emails:
+    webmaster: webmaster@domain.com
+    feedback: feedback@domain.com