controller.js

const Model = require( './model' )
const createController = '../../helpers/createController'

module.exports = require( createController )( Model )( __dirname )

helpers_createController.js

const fs = require( 'fs' )
const path = require( 'path' )

const ACTIONS_PATH = '/actions/'
const forbiden = [ '.', '_' ]

const listFilesIn = require( './listFilesIn' )
const filterHiddenFiles = require( './filterHiddenFiles' )( forbiden )

const removeJSExtension = ( action ) => action.replace('.js', '')
const toObject = ( obj, action ) => Object.assign( obj, action )

const createAction = ( Model, localPath ) => ( action ) => ( {
  [ action ]: require( localPath + ACTIONS_PATH + action )( Model )
} )

const createController = ( Model ) => ( localPath ) => //console.log('localPath', localPath)
  listFilesIn( localPath + ACTIONS_PATH )
    .filter( filterHiddenFiles )
    .map( removeJSExtension )
    .map( createAction( Model, localPath ) )
    .reduce( toObject, {} )

module.exports = ( Model ) => ( localPath ) => createController( Model )( localPath )

helpers_filterHiddenFiles.js

module.exports = ( forbiden ) => ( file ) => 
  !forbiden.some( char => file.startsWith( char ) )
    ? file
    : false

helpers_listFilesIn.js

module.exports = ( path ) => require( 'fs' ).readdirSync( path )