backbone.js - Passing variables into Handlebars template when rendering Marionette/Backbone View -

i'm using handlebars backbone , marionette. i'm compiling handlebars templates , storing them in object can referenced view definitions. i'm using layoutview , regions display various items need in ui.

what want pass (boolean) variables view such handlebars make decisions (via block helper {{#if varname}}) render. clarity don't want persist data i'd rather not make them part of model i'm passing in rendered.

so i'm doing defining backbone.model , marionette.itemview normal, , trying pass in additional variables via initialize:

var newuser = new app.userview({   model: new app.usermodel(),   initialize: function(){     this.isnewdoc = true   } }); // display view in region using app.regions.maun.show(newuser); // ...etc. 

what want able pass in , able refer variables such isnewdoc in handlebars template, ideally via {{#if isnewdoc}}...{{/if}}.

i've tried various permutations line this.isnewdoc = true such isnewdoc: true i'm not getting anywhere. doing wrong?

i override serializedata method when want this. can overriding tojson method in model, mention sent server when persist model. since these calculated attributes , not persistent attributes, don't sending them server. example below:

var newuser = new app.userview({    model: new app.usermodel(),    serializedata: function() {     return _.extend({       isnewdoc: true     }, this.model.tojson());   } });