Implement action_class do ... end

2 files changed, 54 insertions, 17 deletions

diff --git a/lib/chef/resource.rb b/lib/chef/resource.rb
index f969ccd84c..a7b1f63463 100644
--- a/lib/chef/resource.rb
+++ b/lib/chef/resource.rb
@@ -1172,14 +1172,18 @@ class Chef
     # using `action :x do ... end`, then there is no need for this class and
     # `action_class` will be `nil`.
     #
+    # If a block is passed, the action_class is always created and the block is
+    # run inside it.
+    #
     # @api private
     #
-    def self.action_class
-      @action_class ||
-        # If the superclass needed one, then we need one as well.
-        if superclass.respond_to?(:action_class) && superclass.action_class
-          declare_action_class
-        end
+    def self.action_class(&block)
+      return @action_class if @action_class && !block
+      # If the superclass needed one, then we need one as well.
+      if block || (superclass.respond_to?(:action_class) && superclass.action_class)
+        @action_class = declare_action_class(&block)
+      end
+      @action_class
     end
 
     #
@@ -1189,19 +1193,21 @@ class Chef
     # If a block is passed, it is run inside the action_class.
     #
     # @api private
-    def self.declare_action_class
-      return @action_class if @action_class
-
-      if superclass.respond_to?(:action_class)
-        base_provider = superclass.action_class
-      end
-      base_provider ||= Chef::Provider
+    def self.declare_action_class(&block)
+      @action_class ||= begin
+        if superclass.respond_to?(:action_class)
+          base_provider = superclass.action_class
+        end
+        base_provider ||= Chef::Provider
 
-      resource_class = self
-      @action_class = Class.new(base_provider) do
-        include ActionClass
-        self.resource_class = resource_class
+        resource_class = self
+        Class.new(base_provider) do
+          include ActionClass
+          self.resource_class = resource_class
+        end
       end
+      @action_class.class_eval(&block) if block
+      @action_class
     end
 
     #
diff --git a/spec/integration/recipes/resource_action_spec.rb b/spec/integration/recipes/resource_action_spec.rb
index fe6b4083f1..a55ea72b3f 100644
--- a/spec/integration/recipes/resource_action_spec.rb
+++ b/spec/integration/recipes/resource_action_spec.rb
@@ -425,6 +425,37 @@ describe "Resource.action" do
       }.to raise_error(/Property template of has_property_named_template\[hi\] cannot be passed a block! If you meant to create a resource named template instead, you'll need to first rename the property./)
     end
   end
+
+  context "When a resource declares methods in action_class and declare_action_class" do
+    class DeclaresActionClassMethods < Chef::Resource
+      use_automatic_resource_name
+      property :x
+      action :hi do
+        new_resource.x = a + b
+      end
+      action_class do
+        def a
+          1
+        end
+        def b
+          2
+        end
+      end
+    end
+
+    it "the methods are not available on the resource" do
+      expect { DeclaresActionClassMethods.new('hi').a }.to raise_error(NameError)
+      expect { DeclaresActionClassMethods.new('hi').b }.to raise_error(NameError)
+    end
+
+    it "the methods are available to the action" do
+      r = nil
+      expect_recipe {
+        r = declares_action_class_methods 'hi'
+      }.to emit_no_warnings_or_errors
+      expect(r.x).to eq(3)
+    end
+  end
 end
 
 end