dnch · November 9, 2011 05:02 · Nov 9, 2011 · Nov 9, 2011 · Nov 9, 2011
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -15,9 +15,22 @@ class Image < ActiveRecord::Base
 Article.protected_attributes  # => [:active]
 Article.accessible_attributes # => [] # Where are :title and :body?
 
-p = Photo.new
-p.attributes                # => [:title, :filename, :active]
-Photo.protected_attributes  # => [] # Where are :filename and :active?
-Photo.accessible_attributes # => [:title]
+i = Image.new
+i.attributes                # => [:title, :filename, :active]
+Image.protected_attributes  # => [] # Where are :filename and :active?
+Image.accessible_attributes # => [:title]
 
 
+# Possible to calculate sort of like the following, but something in ActiveRecord
+# should already be doing this... Right? :|
+
+# NOTE: Foreign key columns and timestamp columns are included; they must be marked
+#       as protected in a way that doesn't show up in protected_attributes.
+
+def assignable_attributes(record)
+  assignable = []
+  assignable = record.attributes.keys - record.class.protected_attributes.to_a unless record.class.protected_attributes.empty?
+  assignable = record.class.accessible_attributes.to_a unless record.class.accessible_attributes.empty?
+  assignable
+end
+
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,23 @@
+class Article < ActiveRecord::Base
+  # Has attributes: :title, :body, :active
+
+  attr_protected :active
+end
+
+class Image < ActiveRecord::Base
+  # Has attributes: :title, :filename, :active
+
+  attr_accessible :title
+end
+
+a = Article.new
+a.attributes                  # => [:title, :body, :active]
+Article.protected_attributes  # => [:active]
+Article.accessible_attributes # => [] # Where are :title and :body?
+
+p = Photo.new
+p.attributes                # => [:title, :filename, :active]
+Photo.protected_attributes  # => [] # Where are :filename and :active?
+Photo.accessible_attributes # => [:title]
+
+