Silverstripe – Content management on Rails

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Immer wieder bin ich über dieses „Silverstripe“ gestolpert. Es liess mir einfach keine Ruhe. Aber jetzt hab‘ ich mir mal Zeit genommen und es genauer angeschaut. Und ich bin hin und weg!

Saubere Architektur, die vollen Nutzen aus OOP und Vererbung zieht; eine tolle Templating-Engine, welche die Templates schlank und wartbar hält; ein Backend, welches übersichtlich und toll zu bedienen ist und sich sehr einfach erweitern lässt; Security built-in; ein ORM; und mit ein paar Zeilen mehr eine REST-API… Und all diese Komponenten sind perfekt aufeinander abgestimmt und integriert. Selbstverständlich werden alle Inhalte versioniert und mit einem Zusatzmodul können sie sogar zeitlich gesteuert werden.
Und überhaupt und sowieso – genau. It’s sooo marvellous – I’m blown away!

Ich gebe mal meine Eindrücke weiter. Wir fangen an beim

Aufbau

Silverstripe setzt stark auf Seiten. Eine Seite kann von einem bestimmten Typ sein, also ein bestimmtes Verhalten haben, z.B. ein Seitentyp „Forum“ oder „News“.

Jeder Seitentyp hat seinen Controller/Model, mit welchem man… ALLES steuern kann 🙂
Wir werden gleich selber einen Seitentyp erstellen.

Im Backend schaut das ganze so aus:

Standardeinstellungen. Relativ schlank und schön übersichtlich, finde ich. Jede Seite hat die üblichen CMS-Attribute wie Navigationsname, Metatags, Zugriffssteuerungen etc.
Man kann Links auf andere interne Seiten erstellen oder auf externe, es können eigene Textstile definiert werden, welche dann mit einer CSS-Klasse versehen werden, und man hat so die üblichen Formatierungsoptionen. In der Navigation links sind die Seiten per Drag & Drop verschiebbar.
Die weiteren Sektionen wie Kommentare oder Berichte sind für alle Nicht-Seiten Operationen. Und falls man ein eigenes Datenmodell hat, lässt sich leicht eine Sektion hinzufügen, wo man diese Daten administrieren kann und gleich noch ein CSV-Import mitgeliefert bekommt.

Ich kann für jeden Seitentyp zusätzliche Attribute im Backend anzeigen.
So hat man schwuppsdiwupps ein neues Tab Sidebar erstellt, wo vielleicht Teaser angezeigt werden, oder man hat ein Tab Right Column, wo diese Teaser ein- oder ausgeblendet werden können…

Soviel zur Administration von Inhalten.

Templates

SilverStripe first searches for a template in the /templates folder. Since there is no HomePage.ss, it will use the Page.ss for both Page and HomePage page types. When it comes across the $Layout tag, it will then descend into the /templates/Layout folder, and will use Page.ss for the Page page type, and HomePage.ss for the HomePage page type.

Die Templating-Engine ist cool. Es gibt bereits eine Menge vordefinierter Variablen und Kontrollstrukturen; aber ggf. kann man auch seine Eigenen im Controller definieren.

Auch bei Silverstripe gilt:

Convention over Configuration.

Ich kann Templates beliebig unterteilen und anzeigen.
Beispiel: Falls ich auf der 2. Navigationsebene bin, bitte Brotkrümelspur streuen:

Mehr über Templates in der Silverstripe-Doku: http://doc.silverstripe.org/templates

Wir machen einen Beispiel-Seitentyp: GooglemapPage

Ich will auf einer Seite eine Karte anzeigen. Die Koordinaten sollen im Backend pflegbar sein.

Controller

Code und Templates sind strikt getrennt. Jetzt sind wir im Code-Ordner:

Ich erstelle einen neuen Seitentyp-Controller: GooglemapPage. Inhalt:

Aber schön langsam der Reihe nach.

Datenbankschema

Mein Seitentyp erbt von einer normalen Seite. Dort drin befinden sich Definitionen der Datenbankfelder und welche Felder im Backend wo angezeigt werden sollen.

Ich habe meine Datenbank mit /dev/build?flush=1 initialisiert; und so die Datenbank für den neuen Seitentyp vorbereitet.

Mein Googlemap-Seitentyp hat zwei zusätzliche Felder:

Hmm, den Zoomlevel möchte ich auch noch einstellen können. Zeile hinzufügen:

Datenbank-Initialisierung (klick auf’s Bild für grössere Ansicht):

Und hier sieht man sehr schön: Das Feld Zoom wird beim Googlemap-Seitentyp hinzugefügt.

Template

Das Template ist einfach: Hinzu kommt ein map_canvas.

Dann folgt der $Content, das Kommentarformular und die Darstellung der Kommentare.
Ja, es ist wirklich so einfach!

Javascript/CSS

Etwas was ich ganz geil gelöst finde. Die Jungs von Silverstripe haben ja sonst schon alles so perfekt durchdesignt, aber jetzt kommt der echte Knaller (für mich als Frontendler :P)

Ich sage auf Controllerebene: Dieses und dieses Javascript brauch‘ ich für die Googlekarte. Aber bitte zusammengefasst und minifiziert.

Im Template sage ich: Willhaben Javascript. Die Konfiguration geschieht im Controller (siehe oben)

Ist diese Zeile auskommentiert:

…sind wir auf der Live-Umgebung; Fehler werden nicht mehr angezeigt, und die Javascript/CSS-Dateien werden zusammengefasst:

Geil he! Da wird man ja ganz feucht…

Dieses Konzept bedeutet auch: Es wird nur so viel Javascript-Code geladen, wie auf einer Seite gebraucht wird.

Ich sag’s ja: DAS ist Silverstripe! Rockomatisch, episch, genialisch! *hehe*

Ach ja, die Variablen für die Karte. Sind in einem Javascript. Können wir aber auch via Controller übergeben. Is dat ned toll?

GooglemapPage Seitentyp im Backend

So sieht der Googlemap-Seitentyp im Backend aus:

Koordinateneingabe. Die Labels heissen so wie die Datenbankfelder, können aber optional überschrieben werden.
Dropdown: Von 1-19, merkt sich selbstverständlich den Wert in der DB (und nein, dieses Feld habe ich zugunsten der Übersicht im Screenshot oben vom Controller weggelassen).
„So us freud“ habe ich noch zwei eigene Textstile erstellt, nur um zu zeigen, dass Silverstripe auch das kann, was Livelink kann.

Dev-Tools

Stell dir vor, das Datenbankschema passt sich immer an dein Model, deine Seitentypen an.
Und stell dir vor, du hast wirklich mal _viele_ Besucher auf deiner Seite – es gibt da ein StaticPublisher, welcher die Seiten als HTML rendert und statisch ablegt. Zur Not. Aber man kann auch partiell cachen.

Natürlich sind auch Unit-Tests dabei. Natürlich hat man auch Build-Tasks. Und – was ich besonders cool finde: Ich kann mir den Sourcecode als generierte Dokumentation ansehen:

Features

Einfach mal ein Auszug des Inhaltsverzeichnisses vom grossen und heiligen Silverstripe-Buch:

REST in peace

Noch so ein Hammer. Silverstripe kennt ja mein DB-Schema, falls ich so eins erstellt habe für z.B. eine Jobbörse (Beispiel im Buch).

Ist noch geil… Die Felder definieren, auf die via API zugegriffen werden darf:

Fertig ist unsere REST-API.

Gerne auch als JSON:

Module

Und man kann’s erweitern. Es gibt Module und Widgets. Und auch Module haben Seiten und Controller und ein DB-Schema… Welches natürlich die Datenbank entsprechend vorbereitet und erweitert, wenn man das Modul installiert.

http://silverstripe.org/