Modified method of transforming 'except' argument into an array in fields_for_params, per suggestion from jpmckinney. Also added a spec to test this case.

Author: tinynumbers

lib/active_admin/view_helpers/fields_for.rb

@@ -15,11 +15,10 @@ module FormHelper
       #
       def fields_for_params(params, options = {})
         namespace = options[:namespace]
-        except = options[:except]
+        except = options[:except].is_a?(Array) ? options[:except] : [options[:except]]
 
         params.map do |k, v|
           next if namespace.nil? && %w(controller action commit utf8).include?(k.to_s)
-          next if except && k.to_s == except.to_s
           next if except.is_a?(Enumerable) && except.map(&:to_s).include?(k.to_s)
 
           if namespace

spec/unit/view_helpers/fields_for_spec.rb

@@ -14,6 +14,11 @@
       should == [ { :scope => "All" } ]
   end
 
+  it "should allow an array for the except" do
+    fields_for_params({:scope => "All", :name => "Greg", :age => "12"}, :except => [:name, :age]).
+      should == [ { :scope => "All" } ]
+  end
+
   it "should work with hashes" do
     params = fields_for_params(:filters => { :name => "John", :age => "12" })
 
@@ -29,8 +34,8 @@
 
   it "should work with arrays" do
     fields_for_params(:people => ["greg", "emily", "philippe"]).
-      should == [ { "people[]" => "greg" }, 
-                  { "people[]" => "emily" }, 
+      should == [ { "people[]" => "greg" },
+                  { "people[]" => "emily" },
                   { "people[]" => "philippe" } ]
   end
 end