route_action.js

import Ember from 'ember';

const ClosureActionModule = Ember.__loader.require('ember-routing-htmlbars/keywords/closure-action');

export const { ACTION } = ClosureActionModule;

const {
  assert,
  getOwner,
  typeOf,
  Helper,
  run
  } = Ember;

export default Helper.extend({

  compute([actionName, targetName, ...params]) {
    let target;

    assert(`You cannot create a scoped-action without specifying a route or context as the second parameter.`, targetName);

    if (typeof targetName === 'string') {
      let route = getOwner(this).lookup(`route:${targetName}`);

      assert(`You cannot create a scoped-action for the route '${targetName}', as it does not exist`, route);

      let currentRoute = route.router.currentRouteName;
      let isActive = currentRoute.indexOf(targetName) === 0 || targetName === 'application';

      assert(`You cannot create a scoped-action for the route '${targetName}', as it is not a parent of the active route '${currentRoute}'.`, isActive);

      target = route;
    } else {
      target = targetName.target;
    }

    let actions = target.actions || target._actions;
    let action = actions[actionName];

    assert(`You cannot create a scoped-action for the route '${targetName}', as it does not define the action '${actionName}'`, typeOf(action) === 'function');

    let scopedAction = (...invocationArgs) => {
      let args = params.concat(invocationArgs);

      return run.join(target, action, ...args);
    };

    scopedAction[ACTION] = true;

    return scopedAction;
  }

});