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Content model and views

This topic describes the core concepts of content, content model and views, and how these are related in Optimizely Content Cloud (CMS).

Content in Optimizely Content Cloud (CMS) consists of pages, blocks, media files, and folders. It can also be catalog content in Optimizely Commerce.

Model, views and templates

CMS has built-in template support for ASP.NET Core MVC and Razor pages which are covered in this section. CMS can, however, also be used by other rendering techniques such as client-side rendering frameworks.

MVC stands for Model-View-Controller meaning:

  • The Model handles the business logic and is independent of views and controllers.
  • The View just displays data such as a web page, and knows only of the Model.
  • The Controller handles the user interaction and input logic, and has knowledge of both Model and View. As the controller is not dependent on a specific view, it can be reused and tested independently.

The rendering is based on views and templates. In MVC, a template corresponds to a controller and a view, where the controller selects the view to display. The view contains the actual HTML template with embedded code, generating content sent to the client.

By default, MVC applications rely heavily on conventions. For example, when resolving view templates, the system will look for a view template file in a folder with a specific path and name.

A typical Optimizely MVC project often uses the following folder structure to help you organize your code:

  • /App_Data with the content database (in case you choose to attach to an mdf file), and the default log file.
  • /Business for business logic and helper libraries added during development.
  • /Controllers for controller classes handling user input and responses.
  • /Models for content classes representing and manipulating data.
  • /Static for design and layout files such as scripts, images, and style sheets.
  • /Views for renderers.

See Creating a starter project for more details.

Content model

The content system in Optimizely CMS supports strongly typed models, and is based on content types in the Optimizely content model. Content in Optimizely can be almost anything, as long as it is a class that implements the IContent interface. This also provides a set of important basic properties such as the content display name, as well as references and unique identifiers for a content item. See Content.

Content instances, content types and content templates for example, are linked together in the following way:

  • A content type defines a set of properties, for example, page name and publish date, where editors enter content.
  • A content is an instance of the .NET class defining the content type. When a content item is edited, values are assigned to the properties, and stored in the database.
  • The controller and viewfetches the stored property values and renders the output.
  • A template can be associated with the content type, to render the output in a certain context
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Page types

Episerver has a wide range of base classes. Page types are usually defined in code as classes based on a model inheriting from EPiServer.Core.PageData. A PageData object is the programmatic representation of a page, containing the properties defined in your .NET class. The value of currentPage is automatically set to the PageData object that is requested by the client. 

During website initialization, the synchronization engine in Optimizely scans and validates available content types and properties created in code, or from the CMS admin view. The bin folder is scanned for .NET classes inheriting PageData . For each of the classes found, a page type is created. For all public properties on the class, a corresponding property on the page type is created.

The synchronization merges the settings stored in the database (from admin view) with settings defined in code. If the settings conflict, the database setting values take precedence. This means that any settings saved through the admin view will override settings defined in code. See Synchronization.

Properties

Properties store and present data for content in a page type. Properties are added in code, and can be accessed using inline expressions, in markup or in code-behind. The property data type dictates the kind of values that can be entered or rendered. Episerver comes with a set of built-in property types, and you can also define your own. See Properties.

Pages

Pages are created by editors, and based on a specific page type. Pages build up the page tree structure in edit view. Information (both content and meta data) that is saved on a page instance, is stored in the Optimizely CMS database.

Rendering and templates

You can define several different templates (such as Controllers/Views, Razor Pages, view components or partial views) for displaying content in certain context, for example inside another page, or through different channels and devices such as a mobile phone. There are several ways to control the rendering. You can work with TemplateDescriptor, Tags, TemplateResolver, and DisplayChannel, to ensure that the correct rendering is applied depending on display context. See Rendering.

Views

Views are .cshtml files stored in the Views folder. If your view only needs the page object, you can simply pass the currentPage into the view.  Use action-specific views, partial views/controllers, and layouts to reduce code repetition. You can also create view models to make your views more flexible. See View models and partial views.

HTML Helpers

A view contains the HTML for specifying the markup. HTML Helpers render property values based on their property type. Properties can be rendered as markup using the Html.PropertyFor() method. Using this, properties automatically become editable in edit view. Both ASP.NET MVC Core and Optimizely CMS comes with a predefined set of Html.Helper methods to specify the HTML needed for the view. You can also create your own HTML Helpers.


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