diff --git a/app/models/post.rb b/app/models/post.rb
index 8885897f..60382baf 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -15,6 +15,9 @@ class Post
   PUBLIC_ATTRIBUTES = %i[lang date uuid created_at].freeze
   ATTR_SUFFIXES = %w[? =].freeze
 
+  class PostError < StandardError; end
+  class UnknownAttributeError < PostError; end
+
   attr_reader :attributes, :errors, :layout, :site, :document
 
   # TODO: Modificar el historial de Git con callbacks en lugar de
@@ -50,12 +53,33 @@ class Post
     @errors = {}
     @metadata = {}
 
-    # Inicializar valores
+    # Leer el documento si existe
+    # @todo Asignar todos los valores a self[:value] luego de leer
+    document&.read! unless new?
+
+    # Inicializar valores o modificar los que vengan del documento
+    assignable_attributes = args.slice(*attributes)
+    assign_attributes(assignable_attributes) if assignable_attributes.present?
+  end
+
+  # Asignar atributos, ignorando atributos que no se pueden modificar
+  # o inexistentes
+  #
+  # @param attrs [Hash]
+  def assign_attributes(attrs)
+    attrs = attrs.transform_keys(&:to_sym)
+
     attributes.each do |attr|
-      public_send(attr)&.value = args[attr] if args.key?(attr)
+      self[attr].value = attrs[attr] if attrs.key?(attr) && self[attr].writable?
     end
 
-    document.read! unless new?
+    unknown_attrs = attrs.keys.map(&:to_sym) - attributes
+
+    if unknown_attrs.present?
+      raise UnknownAttributeError, "Unknown attribute(s) #{unknown_attrs.map(&:to_s).join(', ')} for Post"
+    end
+
+    nil
   end
 
   def inspect
@@ -165,8 +189,7 @@ class Post
     # Limpiar el nombre del atributo, para que todos los ayudantes
     # reciban el método en limpio
     unless attribute? name
-      raise NoMethodError, I18n.t('exceptions.post.no_method',
-                                  method: name)
+      raise UnknownAttributeError, I18n.t('exceptions.post.no_method', method: name)
     end
 
     define_singleton_method(name) do
@@ -386,11 +409,7 @@ class Post
   end
 
   def update_attributes(hashable)
-    hashable.to_hash.each do |attr, value|
-      next unless self[attr].writable?
-
-      self[attr].value = value
-    end
+    assign_attributes(hashable)
 
     save
   end