Support for removing fields after they've been defined

lib/dynamoid/document.rb

@@ -28,6 +28,7 @@ module ClassMethods
       # @since 0.4.0
       def table(options = {})
         self.options = options
+        super if defined? super
       end
 
       def attr_readonly(*read_only_attributes)

lib/dynamoid/fields.rb

@@ -39,6 +39,14 @@ def range(name, type = :string)
         field(name, type)
         self.range_key = name
       end
+
+      def remove_field(field)
+        field = field.to_sym
+        attributes.delete(field) or raise "No such field"
+        remove_method field
+        remove_method :"#{field}="
+        remove_method :"#{field}?"
+      end
     end
 
     # You can access the attributes of an object directly on its attributes method, which is by default an empty hash.

spec/dynamoid/fields_spec.rb

@@ -100,6 +100,18 @@
     Address.new city: ("Ten chars " * 6_600)
   end
 
+  context '.remove_attribute' do
+    subject { @address }
+    before(:each) do
+      Address.field :foobar
+      Address.remove_field :foobar
+    end
+
+    it('should not be in the attributes hash') { Address.attributes.should_not have_key(:foobar) }
+    it('removes the accessor') { should_not respond_to(:foobar)  }
+    it('removes the writer')   { should_not respond_to(:foobar=) }
+    it('removes the interrogative') { should_not respond_to(:foobar?) }
+  end
 
   context 'default values for fields' do
     before do