diff --git a/drust/src/main.rs b/drust/src/main.rs
index 9da7b124..27bb0886 100644
--- a/drust/src/main.rs
+++ b/drust/src/main.rs
@@ -8,5 +8,5 @@ fn bootstrap() {
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    Application::prepare(bootstrap).await?.run()?.await
+    Application::prepare(UsingBootstrap::Fn(bootstrap)).await?.run()?.await
 }
diff --git a/pagetop-admin/src/lib.rs b/pagetop-admin/src/lib.rs
index c07f617b..56d34e1c 100644
--- a/pagetop-admin/src/lib.rs
+++ b/pagetop-admin/src/lib.rs
@@ -21,4 +21,14 @@ impl ModuleTrait for Admin {
                 .route("", app::web::get().to(summary::summary))
         );
     }
+
+    fn actions(&self) -> Vec<ActionItem> {
+        vec![
+            action_item!(ActionBeforeRenderPage => before_render_page)
+        ]
+    }
+}
+
+fn before_render_page(page: &mut Page) {
+    page.alter_body_classes("test-admin", ClassesOp::Add);
 }
diff --git a/pagetop-node/src/lib.rs b/pagetop-node/src/lib.rs
index c9e2dcda..1f879f36 100644
--- a/pagetop-node/src/lib.rs
+++ b/pagetop-node/src/lib.rs
@@ -20,12 +20,18 @@ impl ModuleTrait for Node {
         cfg.route("/node", app::web::get().to(node));
     }
 
-    fn migrations(&self) -> Vec<Box<dyn db::MigrationTrait>> {
+    fn actions(&self) -> Vec<ActionItem> {
         vec![
-            boxed_migration!(m20220316_000001_create_table_node_type),
-            boxed_migration!(m20220316_000002_create_table_node),
-            boxed_migration!(m20220316_000003_create_table_node_access),
-            boxed_migration!(m20220316_000004_create_table_node_revision),
+            action_item!(ActionBeforeRenderPage => before_render_page, -1)
+        ]
+    }
+
+    fn migrations(&self) -> Vec<MigrationItem> {
+        vec![
+            migration_item!(m20220316_000001_create_table_node_type),
+            migration_item!(m20220316_000002_create_table_node),
+            migration_item!(m20220316_000003_create_table_node_access),
+            migration_item!(m20220316_000004_create_table_node_revision),
         ]
     }
 }
@@ -37,3 +43,7 @@ async fn node() -> app::Result<Markup> {
         )
         .render()
 }
+
+fn before_render_page(page: &mut Page) {
+    page.alter_body_classes("test-node", ClassesOp::Add);
+}
diff --git a/pagetop-node/src/migration/m20220316_000001_create_table_node_type.rs b/pagetop-node/src/migration/m20220316_000001_create_table_node_type.rs
index 50117825..9065836a 100644
--- a/pagetop-node/src/migration/m20220316_000001_create_table_node_type.rs
+++ b/pagetop-node/src/migration/m20220316_000001_create_table_node_type.rs
@@ -19,7 +19,7 @@ enum NodeType {
                         // different from the current type name if the locked field is 0.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -82,9 +82,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-node/src/migration/m20220316_000002_create_table_node.rs b/pagetop-node/src/migration/m20220316_000002_create_table_node.rs
index 62e2bda1..1c8d7b12 100644
--- a/pagetop-node/src/migration/m20220316_000002_create_table_node.rs
+++ b/pagetop-node/src/migration/m20220316_000002_create_table_node.rs
@@ -26,7 +26,7 @@ enum Node {
     Translate,          // A boolean indicating whether this translation page needs to be updated.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -105,9 +105,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-node/src/migration/m20220316_000003_create_table_node_access.rs b/pagetop-node/src/migration/m20220316_000003_create_table_node_access.rs
index 140dac2d..3fa19d66 100644
--- a/pagetop-node/src/migration/m20220316_000003_create_table_node_access.rs
+++ b/pagetop-node/src/migration/m20220316_000003_create_table_node_access.rs
@@ -18,7 +18,7 @@ enum NodeAccess {
                         // this node.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -65,9 +65,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-node/src/migration/m20220316_000004_create_table_node_revision.rs b/pagetop-node/src/migration/m20220316_000004_create_table_node_revision.rs
index 0009359f..621628a6 100644
--- a/pagetop-node/src/migration/m20220316_000004_create_table_node_revision.rs
+++ b/pagetop-node/src/migration/m20220316_000004_create_table_node_revision.rs
@@ -20,7 +20,7 @@ enum NodeRevision {
                         // be displayed at the top of lists in which it appears.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -83,9 +83,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-user/src/lib.rs b/pagetop-user/src/lib.rs
index bbbf01f3..a36c0e6f 100644
--- a/pagetop-user/src/lib.rs
+++ b/pagetop-user/src/lib.rs
@@ -19,12 +19,12 @@ impl ModuleTrait for User {
         cfg.route("/user/login", app::web::get().to(login));
     }
 
-    fn migrations(&self) -> Vec<Box<dyn db::MigrationTrait>> {
+    fn migrations(&self) -> Vec<MigrationItem> {
         vec![
-            boxed_migration!(m20220312_000001_create_table_role),
-            boxed_migration!(m20220312_000002_create_table_role_permission),
-            boxed_migration!(m20220312_000003_create_table_user),
-            boxed_migration!(m20220312_000004_create_table_user_role),
+            migration_item!(m20220312_000001_create_table_role),
+            migration_item!(m20220312_000002_create_table_role_permission),
+            migration_item!(m20220312_000003_create_table_user),
+            migration_item!(m20220312_000004_create_table_user_role),
         ]
     }
 }
diff --git a/pagetop-user/src/migration/m20220312_000001_create_table_role.rs b/pagetop-user/src/migration/m20220312_000001_create_table_role.rs
index 2557453f..649115ac 100644
--- a/pagetop-user/src/migration/m20220312_000001_create_table_role.rs
+++ b/pagetop-user/src/migration/m20220312_000001_create_table_role.rs
@@ -9,7 +9,7 @@ enum Role {
     Weight,             // The weight of this role in listings and the user interface.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -62,9 +62,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-user/src/migration/m20220312_000002_create_table_role_permission.rs b/pagetop-user/src/migration/m20220312_000002_create_table_role_permission.rs
index 052fed2c..7869f029 100644
--- a/pagetop-user/src/migration/m20220312_000002_create_table_role_permission.rs
+++ b/pagetop-user/src/migration/m20220312_000002_create_table_role_permission.rs
@@ -11,7 +11,7 @@ enum RolePermission {
 #[derive(Iden)]
 enum Role { Table, Rid, /* ... */ }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -56,9 +56,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-user/src/migration/m20220312_000003_create_table_user.rs b/pagetop-user/src/migration/m20220312_000003_create_table_user.rs
index c060c8a5..ed3d85f7 100644
--- a/pagetop-user/src/migration/m20220312_000003_create_table_user.rs
+++ b/pagetop-user/src/migration/m20220312_000003_create_table_user.rs
@@ -16,7 +16,7 @@ enum User {
     Timezone,           // User's time zone.
 }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -77,9 +77,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop-user/src/migration/m20220312_000004_create_table_user_role.rs b/pagetop-user/src/migration/m20220312_000004_create_table_user_role.rs
index fedcd4be..cae74e3e 100644
--- a/pagetop-user/src/migration/m20220312_000004_create_table_user_role.rs
+++ b/pagetop-user/src/migration/m20220312_000004_create_table_user_role.rs
@@ -14,7 +14,7 @@ enum User { Table, Uid, /* ... */ }
 #[derive(Iden)]
 enum Role { Table, Rid, /* ... */ }
 
-pub struct Migration;
+pub_migration!(Migration);
 
 #[async_trait::async_trait]
 impl MigrationTrait for Migration {
@@ -62,9 +62,3 @@ impl MigrationTrait for Migration {
         .await
     }
 }
-
-impl MigrationName for Migration {
-    fn name(&self) -> &str {
-        module_name!()
-    }
-}
diff --git a/pagetop/src/api/action/all.rs b/pagetop/src/api/action/all.rs
index e7a4981f..8003d09e 100644
--- a/pagetop/src/api/action/all.rs
+++ b/pagetop/src/api/action/all.rs
@@ -1,5 +1,5 @@
 use crate::Lazy;
-use super::{ActionItem, ActionsHolder, ActionTrait};
+use super::{ActionItem, ActionsHolder};
 
 use std::sync::RwLock;
 use std::collections::HashMap;
@@ -9,9 +9,9 @@ static ACTIONS: Lazy<RwLock<HashMap<&str, ActionsHolder>>> = Lazy::new(|| {
     RwLock::new(HashMap::new())
 });
 
-pub fn register_action(action: impl ActionTrait) {
+pub fn add_action(action: ActionItem) {
     let mut hmap = ACTIONS.write().unwrap();
-    let action_name = action.type_name();
+    let action_name = action.machine_name();
     if let Some(actions) = hmap.get_mut(action_name) {
         actions.add(action);
     } else {
@@ -19,9 +19,11 @@ pub fn register_action(action: impl ActionTrait) {
     }
 }
 
-pub fn run_actions<B, F>(type_name: &'static str, f: F) where F: FnMut(&ActionItem) -> B {
-    let hmap = ACTIONS.read().unwrap();
-    if let Some(actions) = hmap.get(type_name) {
+pub fn run_actions<B, F>(machine_name: &'static str, f: F)
+where
+    F: FnMut(&ActionItem) -> B
+{
+    if let Some(actions) = ACTIONS.read().unwrap().get(machine_name) {
         actions.iter_map(f)
     }
 }
diff --git a/pagetop/src/api/action/definition.rs b/pagetop/src/api/action/definition.rs
index e0bab945..1bd554df 100644
--- a/pagetop/src/api/action/definition.rs
+++ b/pagetop/src/api/action/definition.rs
@@ -1,18 +1,12 @@
-use crate::util;
-
 pub use std::any::Any as AnyAction;
 
-pub trait BaseAction {
-    fn type_name(&self) -> &'static str;
-
-    fn single_name(&self) -> &'static str;
-
-    fn qualified_name(&self, last: usize) -> &'static str;
-}
-
-pub trait ActionTrait: AnyAction + BaseAction + Send + Sync {
+pub trait ActionTrait: AnyAction + Send + Sync {
     fn new() -> Self where Self: Sized;
 
+    fn machine_name(&self) -> &'static str {
+        std::any::type_name::<Self>()
+    }
+
     fn weight(&self) -> isize {
         0
     }
@@ -20,20 +14,6 @@ pub trait ActionTrait: AnyAction + BaseAction + Send + Sync {
     fn as_ref_any(&self) -> &dyn AnyAction;
 }
 
-impl<C: ?Sized + ActionTrait> BaseAction for C {
-    fn type_name(&self) -> &'static str {
-        std::any::type_name::<Self>()
-    }
-
-    fn single_name(&self) -> &'static str {
-        util::partial_type_name(std::any::type_name::<Self>(), 1)
-    }
-
-    fn qualified_name(&self, last: usize) -> &'static str {
-        util::partial_type_name(std::any::type_name::<Self>(), last)
-    }
-}
-
 pub fn action_ref<A: 'static>(action: &dyn ActionTrait) -> &A {
     action.as_ref_any().downcast_ref::<A>().unwrap()
 }
diff --git a/pagetop/src/api/action/holder.rs b/pagetop/src/api/action/holder.rs
index c7dd3ef3..ab3e2405 100644
--- a/pagetop/src/api/action/holder.rs
+++ b/pagetop/src/api/action/holder.rs
@@ -4,7 +4,13 @@ use std::sync::{Arc, RwLock};
 
 pub type ActionItem = Box<dyn ActionTrait>;
 
-#[derive(Clone)]
+#[macro_export]
+macro_rules! action_item {
+    ( $action:ident => $f:ident $(, $weight:expr)? ) => {{
+        Box::new($action::new().with_action($f)$(.with_weight($weight))?)
+    }};
+}
+
 pub struct ActionsHolder(Arc<RwLock<Vec<ActionItem>>>);
 
 impl ActionsHolder {
@@ -12,19 +18,23 @@ impl ActionsHolder {
         ActionsHolder(Arc::new(RwLock::new(Vec::new())))
     }
 
-    pub fn new_with(action: impl ActionTrait) -> Self {
+    pub fn new_with(action: ActionItem) -> Self {
         let mut container = ActionsHolder::new();
         container.add(action);
         container
     }
 
-    pub fn add(&mut self, action: impl ActionTrait) {
+    pub fn add(&mut self, action: ActionItem) {
         let mut actions = self.0.write().unwrap();
-        actions.push(Box::new(action));
+        actions.push(action);
         actions.sort_by_key(|a| a.weight());
     }
 
-    pub fn iter_map<B, F>(&self, f: F) where Self: Sized, F: FnMut(&ActionItem) -> B {
-        let _ = self.0.read().unwrap().iter().map(f);
+    pub fn iter_map<B, F>(&self, f: F)
+    where
+        Self: Sized,
+        F: FnMut(&ActionItem) -> B,
+    {
+        let _: Vec<_> = self.0.read().unwrap().iter().map(f).collect();
     }
 }
diff --git a/pagetop/src/api/action/mod.rs b/pagetop/src/api/action/mod.rs
index e28122e0..78eec705 100644
--- a/pagetop/src/api/action/mod.rs
+++ b/pagetop/src/api/action/mod.rs
@@ -2,18 +2,21 @@ mod definition;
 pub use definition::{
     ActionTrait,
     AnyAction,
-    BaseAction,
     action_ref,
 };
 
 mod holder;
 pub use holder::{
     ActionItem,
+};
+pub(crate) use holder::{
     ActionsHolder,
 };
 
 mod all;
 pub use all::{
-    register_action,
     run_actions,
 };
+pub(crate) use all::{
+    add_action,
+};
diff --git a/pagetop/src/api/component/action.rs b/pagetop/src/api/component/action.rs
index 6479cc11..34f1cc57 100644
--- a/pagetop/src/api/component/action.rs
+++ b/pagetop/src/api/component/action.rs
@@ -1,24 +1,25 @@
 use crate::api::action::{ActionTrait, AnyAction};
 use super::{ComponentTrait, PageAssets};
 
-pub enum TypeAction {
-    BeforeRenderComponent(fn(&mut dyn ComponentTrait, &mut PageAssets)),
-    None,
-}
+pub const ACTION_BEFORE_RENDER_COMPONENT: &str = "pagetop::render::before_render_component";
 
-pub struct ComponentAction {
-    action: TypeAction,
+pub struct ActionBeforeRenderComponent {
+    action: Option<fn(&mut dyn ComponentTrait, &mut PageAssets)>,
     weight: isize,
 }
 
-impl ActionTrait for ComponentAction {
+impl ActionTrait for ActionBeforeRenderComponent {
     fn new() -> Self {
-        ComponentAction {
-            action: TypeAction::None,
+        ActionBeforeRenderComponent {
+            action: None,
             weight: 0,
         }
     }
 
+    fn machine_name(&self) -> &'static str {
+        ACTION_BEFORE_RENDER_COMPONENT
+    }
+
     fn weight(&self) -> isize {
         self.weight
     }
@@ -28,28 +29,20 @@ impl ActionTrait for ComponentAction {
     }
 }
 
-impl ComponentAction {
-    pub fn new(action: TypeAction) -> Self {
-        ComponentAction {
-            action,
-            weight: 0,
-        }
+impl ActionBeforeRenderComponent {
+    pub fn with_action(mut self, action: fn(&mut dyn ComponentTrait, &mut PageAssets)) -> Self {
+        self.action = Some(action);
+        self
     }
 
-    pub fn new_with_weight(action: TypeAction, weight: isize) -> Self {
-        ComponentAction {
-            action,
-            weight,
-        }
+    pub fn with_weight(mut self, weight: isize) -> Self {
+        self.weight = weight;
+        self
     }
 
-    pub fn before_render_component(
-        &self,
-        component: &mut dyn ComponentTrait,
-        assets: &mut PageAssets)
-    {
-        if let TypeAction::BeforeRenderComponent(f) = self.action {
-            f(component, assets)
+    pub fn run(&self, component: &mut dyn ComponentTrait, assets: &mut PageAssets) {
+        if let Some(action) = self.action {
+            action(component, assets)
         }
     }
 }
diff --git a/pagetop/src/api/component/definition.rs b/pagetop/src/api/component/definition.rs
index f7c1df43..a6b2ea7c 100644
--- a/pagetop/src/api/component/definition.rs
+++ b/pagetop/src/api/component/definition.rs
@@ -2,7 +2,7 @@ use crate::html::{Markup, html};
 use crate::util;
 use crate::api::action::{action_ref, run_actions};
 use super::PageAssets;
-use super::action::ComponentAction;
+use super::{ACTION_BEFORE_RENDER_COMPONENT, ActionBeforeRenderComponent};
 
 pub use std::any::Any as AnyComponent;
 
@@ -76,8 +76,8 @@ pub fn render_component(component: &mut dyn ComponentTrait, assets: &mut PageAss
 
     // Acciones de los módulos antes de renderizar el componente.
     run_actions(
-        "",
-        |a| action_ref::<ComponentAction>(&**a).before_render_component(component, assets)
+        ACTION_BEFORE_RENDER_COMPONENT,
+        |a| action_ref::<ActionBeforeRenderComponent>(&**a).run(component, assets)
     );
 
     // Acciones del tema antes de renderizar el componente.
diff --git a/pagetop/src/api/component/mod.rs b/pagetop/src/api/component/mod.rs
index 7c9482c6..1203d1b2 100644
--- a/pagetop/src/api/component/mod.rs
+++ b/pagetop/src/api/component/mod.rs
@@ -1,4 +1,8 @@
-pub mod action;
+mod action;
+pub use action::{
+    ACTION_BEFORE_RENDER_COMPONENT,
+    ActionBeforeRenderComponent,
+};
 
 mod assets;
 pub use assets::{
diff --git a/pagetop/src/api/module/all.rs b/pagetop/src/api/module/all.rs
index 56e1d6c4..3d5d9a77 100644
--- a/pagetop/src/api/module/all.rs
+++ b/pagetop/src/api/module/all.rs
@@ -1,4 +1,5 @@
 use crate::{Lazy, app, run_now, trace};
+use crate::api::action::add_action;
 use crate::db::*;
 use super::ModuleTrait;
 
@@ -37,12 +38,20 @@ pub fn modules(cfg: &mut app::web::ServiceConfig) {
     }
 }
 
+pub fn register_actions() {
+    for m in MODULES.read().unwrap().iter() {
+        for a in m.actions().into_iter() {
+            add_action(a);
+        }
+    }
+}
+
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-pub fn migrations() {
+pub fn run_migrations() {
     run_now({
         struct Migrator;
         impl MigratorTrait for Migrator {
-            fn migrations() -> Vec<Box<dyn MigrationTrait>> {
+            fn migrations() -> Vec<MigrationItem> {
                 let mut migrations = vec![];
                 for m in MODULES.read().unwrap().iter() {
                     migrations.append(&mut m.migrations());
diff --git a/pagetop/src/api/module/definition.rs b/pagetop/src/api/module/definition.rs
index 837304f3..eb07350c 100644
--- a/pagetop/src/api/module/definition.rs
+++ b/pagetop/src/api/module/definition.rs
@@ -1,7 +1,8 @@
 use crate::{app, util};
+use crate::api::action::ActionItem;
 
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-use crate::db;
+use crate::db::MigrationItem;
 
 pub trait BaseModule {
     fn type_name(&self) -> &'static str;
@@ -25,9 +26,13 @@ pub trait ModuleTrait: BaseModule + Send + Sync {
     fn configure_module(&self, cfg: &mut app::web::ServiceConfig) {
     }
 
+    fn actions(&self) -> Vec<ActionItem> {
+        vec![]
+    }
+
     #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
     #[allow(unused_variables)]
-    fn migrations(&self) -> Vec<Box<dyn db::MigrationTrait>> {
+    fn migrations(&self) -> Vec<MigrationItem> {
         vec![]
     }
 
diff --git a/pagetop/src/app/application.rs b/pagetop/src/app/application.rs
index 1b7564ea..98a49f80 100644
--- a/pagetop/src/app/application.rs
+++ b/pagetop/src/app/application.rs
@@ -9,12 +9,10 @@ pub struct Application {
     server: app::Server,
 }
 
-pub fn essence() {
-    trace::info!("No bootstrap configured");
-}
+pub enum UsingBootstrap {Fn(fn()), No}
 
 impl Application {
-    pub async fn prepare(bootstrap: fn()) -> Result<Self, Error> {
+    pub async fn prepare(bootstrap: UsingBootstrap) -> Result<Self, Error> {
         // Rótulo de presentación.
         app::banner::print_on_startup();
 
@@ -36,15 +34,20 @@ impl Application {
 
         // Ejecuta la función de inicio de la aplicación.
         trace::info!("Calling application bootstrap");
-        let _ = &bootstrap();
+        if let UsingBootstrap::Fn(bootstrap) = bootstrap {
+            let _ = &bootstrap();
+        }
 
         // Registra el módulo de presentación de PageTop.
         // Normalmente se sobrecargará en la función de inicio.
         module::register_module(&base::module::demopage::Demopage);
 
+        // Registra las acciones de todos los módulos.
+        module::all::register_actions();
+
         // Actualizaciones pendientes de la base de datos (opcional).
         #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-        module::all::migrations();
+        module::all::run_migrations();
 
         // Prepara el servidor web.
         let server = app::HttpServer::new(move || {
diff --git a/pagetop/src/db.rs b/pagetop/src/db.rs
index 4b35bd59..d350043e 100644
--- a/pagetop/src/db.rs
+++ b/pagetop/src/db.rs
@@ -4,8 +4,23 @@ pub use sea_orm::{DatabaseConnection as DbConn, ExecResult, QueryResult};
 
 pub use sea_schema::migration::prelude::*;
 
+pub type MigrationItem = Box<dyn MigrationTrait>;
+
 #[macro_export]
-macro_rules! boxed_migration {
+macro_rules! pub_migration {
+    ( $migration:ident ) => {
+        pub struct $migration;
+
+        impl MigrationName for $migration {
+            fn name(&self) -> &str {
+                crate::util::partial_type_name(module_path!(), 1)
+            }
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! migration_item {
     ( $migration_module:ident ) => {{
         Box::new(migration::$migration_module::Migration)
     }};
diff --git a/pagetop/src/html/classes.rs b/pagetop/src/html/classes.rs
index 225d6537..740d1f89 100644
--- a/pagetop/src/html/classes.rs
+++ b/pagetop/src/html/classes.rs
@@ -72,7 +72,7 @@ impl Classes {
 
             ClassesOp::SetDefault => self.default = classes.to_owned(),
         }
-        self.option = Some(concat_string!(self.default, " ", self.added).trim().to_owned());
+        self.option = Some(concat_string!(self.default, " ", self.added.trim()).to_owned());
         self
     }
 
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index 079deb63..357c31cf 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -4,7 +4,6 @@
 pub use crate::{
     args,
     concat_string,
-    module_name,
     theme_static_files,
 };
 
@@ -14,19 +13,24 @@ pub use crate::localize;
 pub use crate::html::*;
 
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-pub use crate::{db, db::*, boxed_migration};
+pub use crate::{
+    db,
+    db::*,
+    pub_migration,
+    migration_item,
+};
 
-pub use crate::api::{
+pub use crate::{action_item, api::{
     action::*,
     component::*,
     module::*,
     theme::*,
-};
+}};
 
 pub use crate::response::page::*;
 
 pub use crate::app;
-pub use crate::app::application::{Application, essence};
+pub use crate::app::application::{Application, UsingBootstrap};
 
 pub use crate::base::component::*;
 
diff --git a/pagetop/src/response/page/action.rs b/pagetop/src/response/page/action.rs
index e90f05be..d47b5ca6 100644
--- a/pagetop/src/response/page/action.rs
+++ b/pagetop/src/response/page/action.rs
@@ -1,26 +1,25 @@
 use crate::api::action::{ActionTrait, AnyAction};
-use crate::api::component::{ComponentTrait, PageAssets};
 use super::Page;
 
-pub enum TypeAction {
-    BeforeRenderPage(fn(&mut Page)),
-    BeforeRenderComponent(fn(&mut dyn ComponentTrait, &mut PageAssets)),
-    None,
-}
+pub const ACTION_BEFORE_RENDER_PAGE: &str = "pagetop::render::before_render_page";
 
-pub struct PageAction {
-    action: TypeAction,
+pub struct ActionBeforeRenderPage {
+    action: Option<fn(&mut Page)>,
     weight: isize,
 }
 
-impl ActionTrait for PageAction {
+impl ActionTrait for ActionBeforeRenderPage {
     fn new() -> Self {
-        PageAction {
-            action: TypeAction::None,
+        ActionBeforeRenderPage {
+            action: None,
             weight: 0,
         }
     }
 
+    fn machine_name(&self) -> &'static str {
+        ACTION_BEFORE_RENDER_PAGE
+    }
+
     fn weight(&self) -> isize {
         self.weight
     }
@@ -30,34 +29,20 @@ impl ActionTrait for PageAction {
     }
 }
 
-impl PageAction {
-    pub fn new(action: TypeAction) -> Self {
-        PageAction {
-            action,
-            weight: 0,
-        }
+impl ActionBeforeRenderPage {
+    pub fn with_action(mut self, action: fn(&mut Page)) -> Self {
+        self.action = Some(action);
+        self
     }
 
-    pub fn new_with_weight(action: TypeAction, weight: isize) -> Self {
-        PageAction {
-            action,
-            weight,
-        }
+    pub fn with_weight(mut self, weight: isize) -> Self {
+        self.weight = weight;
+        self
     }
 
-    pub fn before_render_page(&self, page: &mut Page) {
-        if let TypeAction::BeforeRenderPage(f) = self.action {
-            f(page)
-        }
-    }
-
-    pub fn before_render_component(
-        &self,
-        component: &mut dyn ComponentTrait,
-        assets: &mut PageAssets)
-    {
-        if let TypeAction::BeforeRenderComponent(f) = self.action {
-            f(component, assets)
+    pub fn run(&self, page: &mut Page) {
+        if let Some(action) = self.action {
+            action(page)
         }
     }
 }
diff --git a/pagetop/src/response/page/mod.rs b/pagetop/src/response/page/mod.rs
index 097bde8b..3d8194f2 100644
--- a/pagetop/src/response/page/mod.rs
+++ b/pagetop/src/response/page/mod.rs
@@ -1,4 +1,8 @@
-pub mod action;
+mod action;
+pub use action::{
+    ACTION_BEFORE_RENDER_PAGE,
+    ActionBeforeRenderPage,
+};
 
 mod page;
 pub use page::Page;
diff --git a/pagetop/src/response/page/page.rs b/pagetop/src/response/page/page.rs
index b52566a8..13944810 100644
--- a/pagetop/src/response/page/page.rs
+++ b/pagetop/src/response/page/page.rs
@@ -6,7 +6,7 @@ use crate::api::component::*;
 
 use std::collections::HashMap;
 
-use super::action::PageAction;
+use super::{ACTION_BEFORE_RENDER_PAGE, ActionBeforeRenderPage};
 
 static DEFAULT_LANGUAGE: Lazy<Option<String>> = Lazy::new(|| {
     let language = SETTINGS.app.language[..2].to_lowercase();
@@ -151,10 +151,10 @@ impl<'a> Page<'a> {
     // Page RENDER.
 
     pub fn render(&mut self) -> app::Result<Markup> {
-        // Acciones de los módulos antes de renderizar el tema.
+        // Acciones de los módulos antes de renderizar la página.
         run_actions(
-            "",
-            |a| action_ref::<PageAction>(&**a).before_render_page(self)
+            ACTION_BEFORE_RENDER_PAGE,
+            |a| action_ref::<ActionBeforeRenderPage>(&**a).run(self)
         );
 
         // Acciones del tema antes de renderizar la página.
diff --git a/pagetop/src/util.rs b/pagetop/src/util.rs
index ca4a96fc..f87b67fc 100644
--- a/pagetop/src/util.rs
+++ b/pagetop/src/util.rs
@@ -18,17 +18,6 @@ macro_rules! args {
     }};
 }
 
-#[macro_export]
-macro_rules! module_name {
-    () => {{
-        let name = module_path!();
-        match name.rfind("::") {
-            Some(position) => &name[(position + 2)..],
-            None => name
-        }
-    }};
-}
-
 #[macro_export]
 macro_rules! theme_static_files {
     ( $cfg:ident, $dir:expr ) => {{
@@ -47,7 +36,7 @@ macro_rules! theme_static_files {
     }};
 }
 
-pub(crate) fn partial_type_name(type_name: &'static str, last: usize) -> &'static str {
+pub fn partial_type_name(type_name: &'static str, last: usize) -> &'static str {
     if last == 0 {
         return type_name;
     }