It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media
This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.
| #!/bin/sh | |
| ### BEGIN INIT INFO | |
| ## END INIT INFO | |
| # Path to play install folder | |
| PLAY_HOME=/path/to/play_home | |
| PLAY=$PLAY_HOME/play | |
| # Path to the JVM | |
| JAVA_HOME=/usr/lib/jvm/java-6-sun |
| #!/bin/bash | |
| # chkconfig: 345 20 80 | |
| # description: Play start/shutdown script | |
| # processname: play | |
| # | |
| # Instalation: | |
| # copy file to /etc/init.d | |
| # chmod +x /etc/init.d/play | |
| # chkconfig --add /etc/init.d/play | |
| # chkconfig play on |
| /usr/sbin/groupadd -g 30119 jenkins | |
| /usr/sbin/useradd -u 30119 -g jenkins jenkins | |
| mkdir /home/jenkins | |
| # Download Play! to /home/jenkins | |
| chown -R jenkins. /home/jenkins |
| package controllers | |
| import play.api._ | |
| import play.api.mvc._ | |
| import java.io.File | |
| import java.io.FileInputStream | |
| import play.api.libs.iteratee.Enumerator | |
| object VideoStream extends Controller { |