backbone fetch() not working

I’m trying to use the REST API with Backbone in a plugin. I’m working through the documentation and examples at: https://developer.wordpress.org/rest-api/using-the-rest-api/backbone-javascript-client/. The first example to create a post works as expected: // Create a new post var post = new wp.api.models.Post( { title: ‘This is a test post’ } ); post.save(); a new post is…