diff --git a/app/models/metadata_boolean.rb b/app/models/metadata_boolean.rb
index a2c9c10..5e4b456 100644
--- a/app/models/metadata_boolean.rb
+++ b/app/models/metadata_boolean.rb
@@ -28,6 +28,15 @@ class MetadataBoolean < MetadataTemplate
     return document.data.fetch(name.to_s, default_value) if self[:value].nil?
     return self[:value] unless self[:value].is_a? String
 
-    self[:value] = self[:value] == '1'
+    self[:value] = true_values.include? self[:value]
+  end
+
+  private
+
+  # Los valores que evalúan a verdadero
+  #
+  # XXX: memoizamos porque Struct no puede declarar constantes.
+  def true_values
+    @true_values ||= %w[1 on true].freeze
   end
 end
diff --git a/app/models/post.rb b/app/models/post.rb
index 19bb306..f05faab 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -51,7 +51,7 @@ class Post < OpenStruct
            MetadataFactory.build(document: document,
                                  post: self,
                                  site: site,
-                                 name: name,
+                                 name: name.to_sym,
                                  value: args[name.to_sym],
                                  layout: layout,
                                  type: template['type'],