inherit-model.js

var Ember = require('ember');

Ember.Route.reopen({

  model: function(params, transition) {
    var match, name, sawParams, value;
    for (var prop in params) {
      if (prop === 'queryParams') { continue; }
      if (match = prop.match(/^(.*)_id$/)) {
        name = match[1];
        value = params[prop];
      }
      sawParams = true;
    }
    if (!name && sawParams) {
      return Ember.copy(params);
    } else if (!name) {
      if (transition.resolveIndex !== transition.state.handlerInfos.length-1) { return; }
      var parentModel = transition.state.handlerInfos[transition.resolveIndex-1].context;
      return parentModel;
    }
    return this.findModel(name, value);
  }

});