docs: function( model ) {
  			if ( model instanceof Backbone.RelationalModel ) {
  				model = model.constructor;
  			}
  			
  			var rootModel = model;
  			while ( rootModel._superModel ) {
  				rootModel = rootModel._superModel;
  			}
  			
  			var coll = _.detect( this._collections, function( c ) {
  					return c.model === rootModel;
  				});
  			
  			if ( !coll ) {
  				coll = this._createCollection( rootModel );
  			}
  			
  			return coll;
  		}