How I could imagine a more useful blobs class ...

gistfile1.java

Usage: 



public class MyModel extends ...{
    @Reference
    public static List<Blob2> images; 


    @Reference
    public static Blob2 avatar; 
}





Supporting classes: 


/**
 * You must think of blobs as immutable object. 
 * Once created you may only modify metadata, but the binary data remains the same. 
 * 
 * @author hansi
 */
@Entity
public class Blob2 extends Model{
	// the original filename (guess this could be taken from the blob object)
	public String filename;
	
	// the original image data ... 
	// (this could be a gridfsdbobject, i'm just using blob because it's already in there) 
	public Blob data;
	
	
	public Blob2(){
		
	}
	
	public Blob2( InputStream body, String filename ){
		this.filename = filename;
		data = new Blob( body, MimeTypes.getContentType( filename ) );
	}
}





package models;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import play.data.binding.Global;
import play.data.binding.TypeBinder;

/**
 * And again the binder. 
 * This could be a little smarter, 
 * i.e. it could auto-create blobs when file uploads happen. 
 * 
 * @author hansi
 */
@Global
public class ImageBlobBinder implements TypeBinder<ImageBlob>{
 
	@Override
	public Object bind(String name, Annotation[] annotations, String value,
			Class actualClass, Type genericType) throws Exception {
		return Blob2.findById( value ); 
	}
}