diff --git a/Makefile b/Makefile
index e2e320d..af46648 100644
--- a/Makefile
+++ b/Makefile
@@ -29,10 +29,13 @@ serve: /etc/hosts
 
 # make rails args="db:migrate"
 rails:
-	$(hain) 'cd /Sutty/sutty; bundle exec rails $(args)'
+	$(MAKE) bundle args="exec rails $(args)"
 
 rake:
-	$(hain) 'cd /Sutty/sutty; bundle exec rake $(args)'
+	$(MAKE) bundle args="exec rake $(args)"
+
+bundle:
+	$(hain) 'cd /Sutty/sutty; bundle $(args)'
 
 # Servir JS con el dev server.
 # Esto acelera la compilación del javascript, tiene que correrse por separado
diff --git a/app/controllers/sites_controller.rb b/app/controllers/sites_controller.rb
index d221628..20ce5ba 100644
--- a/app/controllers/sites_controller.rb
+++ b/app/controllers/sites_controller.rb
@@ -72,7 +72,8 @@ class SitesController < ApplicationController
     authorize site
 
     # XXX: Convertir en una máquina de estados?
-    DeployJob.perform_async site.id if site.enqueue!
+    site.enqueue!
+    DeployJob.perform_async site.id
 
     redirect_to site_posts_path(site, locale: site.default_locale)
   end
diff --git a/app/jobs/deploy_job.rb b/app/jobs/deploy_job.rb
index 98e474a..f1ceca9 100644
--- a/app/jobs/deploy_job.rb
+++ b/app/jobs/deploy_job.rb
@@ -8,13 +8,20 @@ class DeployJob < ApplicationJob
   def perform(site, notify = true)
     ActiveRecord::Base.connection_pool.with_connection do
       @site = Site.find(site)
-      @site.update_attribute :status, 'building'
+
+      # Si ya hay una tarea corriendo, aplazar esta
+      if @site.building?
+        DeployJob.perform_in(60, site, notify)
+        return
+      end
+
+      @site.update status: 'building'
       # Asegurarse que DeployLocal sea el primero!
       @deployed = { deploy_local: deploy_locally }
 
       # No es opcional
       unless @deployed[:deploy_local]
-        @site.update_attribute :status, 'waiting'
+        @site.update status: 'waiting'
         notify_usuaries if notify
 
         # Hacer fallar la tarea
@@ -23,7 +30,7 @@ class DeployJob < ApplicationJob
 
       deploy_others
       notify_usuaries if notify
-      @site.update_attribute :status, 'waiting'
+      @site.update status: 'waiting'
     end
   end
   # rubocop:enable Metrics/MethodLength
diff --git a/app/models/metadata_document_date.rb b/app/models/metadata_document_date.rb
index a07c559..34cbe1c 100644
--- a/app/models/metadata_document_date.rb
+++ b/app/models/metadata_document_date.rb
@@ -8,7 +8,7 @@ class MetadataDocumentDate < MetadataTemplate
   end
 
   def value_from_document
-    return nil unless document.path
+    return nil if post.new?
 
     document.date
   end
diff --git a/app/models/post.rb b/app/models/post.rb
index 19eda8d..c2eee8f 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -55,9 +55,7 @@ class Post
       public_send(attr)&.value = args[attr] if args.key?(attr)
     end
 
-    # XXX: No usamos Post#read porque a esta altura todavía no sabemos
-    # nada del Document
-    document.read! if File.exist? document.path
+    document.read! unless new?
   end
 
   def inspect
diff --git a/app/models/site.rb b/app/models/site.rb
index b3cae93..abab9f5 100644
--- a/app/models/site.rb
+++ b/app/models/site.rb
@@ -306,14 +306,25 @@ class Site < ApplicationRecord
 
   # Poner en la cola de compilación
   def enqueue!
-    !enqueued? && update_attribute(:status, 'enqueued')
+    update(status: 'enqueued') if waiting?
   end
 
   # Está en la cola de compilación?
+  #
+  # TODO: definir todos estos métodos dinámicamente, aunque todavía no
+  # tenemos una máquina de estados propiamente dicha.
   def enqueued?
     status == 'enqueued'
   end
 
+  def waiting?
+    status == 'waiting'
+  end
+
+  def building?
+    status == 'building'
+  end
+
   # Cargar el sitio Jekyll
   #
   # TODO: En lugar de leer todo junto de una vez, extraer la carga de
diff --git a/test/controllers/sites_controller_test.rb b/test/controllers/sites_controller_test.rb
index 5f67092..a7e2f68 100644
--- a/test/controllers/sites_controller_test.rb
+++ b/test/controllers/sites_controller_test.rb
@@ -102,6 +102,13 @@ class SitesControllerTest < ActionDispatch::IntegrationTest
                                  'index.html'))
   end
 
+  test 'no se pueden encolar varias veces seguidas' do
+    assert_enqueued_jobs 2 do
+      post site_enqueue_url(@site), headers: @authorization
+      post site_enqueue_url(@site), headers: @authorization
+    end
+  end
+
   test 'se pueden actualizar' do
     name = SecureRandom.hex
     design = Design.all.where.not(id: @site.design_id).sample