##Umbraco 7 Relation Editor

PM > install-package Umbraco.RelationEditor

The editor will appear for supported objects after they're configured.

Supported ObjectTypes are

• Document
• Media
• DocumentType
• MediaType

Supported relation types are

• Document -> Document
• Document -> Media
• Media -> Document
• Media -> Media
• DocumentType -> DocumentType
• DocumentType -> MediaType
• MediaType -> DocumentType
• MediaType -> MediaType

To enable relations on an object type, right click its definition and select "Enable Relations". For Document- and Media types, you can select which kinds types to enable the relation for. You can for instance configure a relation to just accept one type of document type. Once a relation type is enabled for an object type, you can right click individual objects and relate them. Enabling a relation on a document type for example enables the "Edit Relations" action in its context menu.

There are extensions for IPublishedContent that can fetch related content.
These can be found in the Umbraco.RelationEditor.Extensions namespace.
Example usage:

var relatedBlogposts = Model.Content.Related<IPublishedContent>("relatedBlogposts");
var relatedTextPages = Model.Content.RelatedParents<TextPage>("relatedTextpages");
var relatedFiles = Model.Content.RelatedChildren<File>("relatedFiles");