application.js

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require angular
//= require_tree .
console.log("application.js called");

customers_app.js

var app = angular.module('customers', []);

console.log("customers_app.js called!");

app.controller("CustomerSearchController", ['$scope', function($scope) {
  
  console.log("CustomerSearchController function called");
  
  $scope.search = function(searchTerm) {
    console.log("search function called");
    $scope.searchedFor = searchTerm;
  };
}]);