Desarrollando Plugins de Discourse - Parte 2 - Conectar a un outlet de plugin

[Discourse]

Tutorial anterior: Developing Discourse Plugins - Part 1 - Create a basic plugin

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Primeros pasos: Plantillas Handlebars

La aplicación cliente de Discourse está escrita utilizando el framework Javascript Ember.js. Ember utiliza Handlebars para todas las plantillas HTML. Hay una excelente introducción al lenguaje de plantillas en ese enlace, así que asegúrate de leerlo detenidamente.

El problema: Añadir elementos a la interfaz de usuario de Discourse

Muchos plugins necesitan añadir y extender la interfaz web de Discourse. Proporcionamos un mecanismo para hacer esto llamado plugin outlets (puntos de conexión de plugin) en las plantillas Handlebars.

Si navegas por las plantillas Handlebars de Discourse, a menudo verás el siguiente marcado:

<PluginOutlet @name="edit-topic" />

Esto declara un plugin outlet llamado “edit-topic”. Es un punto de extensión en la plantilla que los autores de plugins pueden aprovechar para añadir su propio marcado Handlebars.

Al crear tu plugin, busca en las plantillas Handlebars de Discourse (en archivos .hbs) donde deseas realizar cambios un <PluginOutlet />. Si no hay uno, ¡simplemente pídenos que lo extendamos! Estaremos encantados de añadirlos si tienes un buen caso de uso. Si quieres que sea más fácil y rápido para nosotros hacerlo, ¡por favor, envía una solicitud de extracción (pull request) en github!

Si quieres ver algunos de los lugares donde existen plugin outlets, puedes ejecutar el siguiente comando si estás en OSX o Linux:

git grep "<PluginOutlet" -- "*.hbs"

También puedes mostrar los plugin outlets en un sitio de Discourse activando la Barra de herramientas de desarrollador de Discourse. Simplemente escribe enableDevTools() en la consola del navegador en un foro de Discourse y haz clic en el icono del enchufe que aparece en el lado izquierdo de la página.

Conexión a un Plugin Outlet

Una vez que hayas encontrado el plugin outlet al que deseas añadir contenido, tienes que escribir un connector para él. Un connector es realmente solo una plantilla Handlebars cuyo nombre de archivo incluye connectors/<nombre del outlet> en él.

Por ejemplo, si la plantilla Handlebars de Discourse tiene:

<PluginOutlet @name="evil-trout" />

Entonces cualquier archivo Handlebars que crees en el directorio connectors/evil-trout se adjuntará automáticamente. Así que si crearas el archivo:

plugins/hello/assets/javascripts/discourse/connectors/evil-trout/hello.hbs

Con el contenido:

<b>Hello World</b>

Discourse insertaría <b>Hello World</b> en ese punto de la plantilla.

Nótese que llamamos al archivo hello.hbs – La parte final del nombre del archivo no importa, pero debe ser única en todos los plugins. Es útil nombrarlo algo descriptivo de lo que estás extendiendo para hacer. Esto facilitará la depuración en el futuro.

Solución de problemas

• Comprueba dos veces el nombre del connector y asegúrate de que coincida perfectamente con el nombre del plugin.

Más información

Using Plugin Outlet Connectors from a Theme or Plugin

Discourse includes hundreds of Plugin Outlets which can be used to inject new content or replace existing contend in the Discourse UI. ‘Outlet arguments’ are made available so that content can be customized based on the context. Choosing an outlet To find the name of a plugin outlet, search Discourse core for “<PluginOutlet”, or use the plugin outlet locations theme component. (e.g. topic-above-posts). Wrapper outlets Some outlets in core look like <PluginOutlet @name="foo" />. These allow you…

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Más en la serie

Parte 1: Conceptos básicos de plugins
Parte 2: Este tema
Parte 3: Configuración del sitio
Parte 4: Configuración de git
Parte 5: Interfaces de administrador
Parte 6: Pruebas de aceptación
Parte 7: Publica tu plugin

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Este documento está controlado por versiones: sugiere cambios en github.

[kennym (Kenny Meyer)]

Is there a list of plugin outlets?

More specifically I would like to know if one could modify the “create topic” template?

[cpradio]

@kennym

More specifically I would like to know if one could modify the “create topic” template?

In what way? Add new fields to the composer area (like the tagging plugin does)?

[kennym (Kenny Meyer)]

Yes, that’s what I am searching for.

[eviltrout (Robin Ward)]

I’d take a look at the tagging plugin then. It might have all you want!

[Andrew_Byrne]

@eviltrout is there a way to output directly to JSON.
basically creating a new API endpoint?

[Andrew_Byrne]

Ahhhhhhhh. new to this whole “ruby fad”
I have a partial solution that i’ll detail in:

Multiple topics in single API request

Using the Discourse API is pretty cool and I’ve used it to provide a number of custom interrogations in related sites. One thing that has caused me some issues is the fact I need to make single requests on each topic via: GET discourse.foo/t/topicID/1234.json for most Discourse systems this is cool but I am blending results, ie requesting multiple topics and adding them to a single post feed. when the number increases the requests become… annoying. I’m looking for a solution something along t…

[andrewroth]

Hi Robin,

The plugin-outlet-locations plugin seems to declare all the connectors with a register_asset line in plugin.rb. Starting here: discourse-plugin-outlet-locations/plugin.rb at master · Mittineague/discourse-plugin-outlet-locations · GitHub

Is that a necessary step?

[eviltrout (Robin Ward)]

Nope - that’s not necessary. All .es6 and .hbs files are loaded automatically in plugins.

[kourou (Ilias)]

I am still trying to figure out how plugins in Discourse work and I could use a little help.

I would like to modify the timeline scroll bar (in the right side of each topic). Actually, what I need to do is add some stuff (image/banner) below the scroll bar.
What template should I edit? Is there an existing plugin-outlet for that?

Thank you,
Ilias

[1c7 (Cheng Zheng)]

2018-4-28 work for me!

1. Plugin Outlet name

2. Code

3. Result

[sarahann (Sarah)]

This guide is great! I had my plugin showing in the /admin/plugins quite easily.

I was wondering though, how do you delete items from a template?

For privacy reasons, I wanted to delete the export to csv button in the /admin/users/list/active as well as the show emails button. But I didn’t find a plugin outlet connector for those parts of the UI.

I was trying to overwrite the following templates

/users-list-show.hbs
/users-list.hbs

with my plugin outlet.

But creating these files
/var/www/discourse/plugins/[my-plugin]/assets/javascripts/admin/templates/users-list-show.hbs
/var/www/discourse/plugins/[my-plugin]/assets/javascripts/admin/templates/users-list.hbs
and making changes to them didnt seem to work. Even after deleting the /var/www/discourse/tmp folder and restarting the server.

Is this the correct way to delete those buttons from the UI? Using css display: none; isn’t an option.

I feel like I am missing something really simple, any ideas?

[merefield (Robert)]

@sarahann

For privacy reasons, I wanted to delete the export to csv button in the /admin/users/list/active as well as the show emails button.

Not a direct technical answer to your question but why would you want to do that?

Only the admins can do this. They usually have full control of the server most likely anyway and could read the database, so hiding a button is a bit futile: emails will also show up in the Email logs and on your mail service logs. I’m afraid site admins are going to see a lot of email addresses!

Admins have full control, they see everything (except passwords presumably), so this is normal.

If you are an admin, get used to the responsibility which comes with knowing all of this!

[sarahann (Sarah)]

My concern was that moderators can access some things in the admin dashboard.
They can navigate to the ‘users’ tab and see the Export and the Show Emails buttons

We don’t want our moderators to be able to grab bulk emails like this.
I understand that the emails are visible on users profiles, but we didn’t want an easy way to get this information.

So I was trying to create a plugin that hides these buttons.

[merefield (Robert)]

Could be wrong, but this suggests it’s not an issue … have you Impersonated a Mod?

[sarahann (Sarah)]

Yes, the screenshot I took was from impersonating a mod.

We have a similar setup as the link you provided (Moderators ability to see emails inconsistent).

I’m not requesting the Discourse team makes any changes though, this isn’t an issue with Discourse.

I am trying customize Discourse for our situation. I was hoping that using a plugin outlet and referencing the files within that plugin was the right way to overwrite a template in Discourse. I just wasn’t able to successfully overwrite these files:

/users-list-show.hbs
/users-list.hbs

My changes never showed up. So I thought this plugin outlet topic could help

[merefield (Robert)]

Perhaps someone else can chime in, but I’ve always seen Outlets as additive. You may need an override technique instead (via javascript/Ember). I’m still learning this myself :).

[Mittineague]

I’m thinking that if overriding a template is the goal that it might be better to do this with a theme instead of a plugin.

[sarahann (Sarah)]

I was thinking that as well, but I didn’t want a user to swap their theme and be able to get different functionality. So I figured a plugin outlet would do the trick

[pfaffman (Jay Pfaffman)]

I think you can probably hide those with CSS.