How to use the bookshelf.initialize function in bookshelf

if no additional arguments were provided, use the postgres connection.
It's messy, but so it goes...
 */
if (process.env.testing) {
  console.log('Connecting to SQLite3 testing database...');
  config = require('../../test/config/db');
} else if (process.argv[2] === 'sqlite3') {
  console.log('Connecting to SQLite3 development database...');
  config = require('../../config/db_sqlite');
  newDB = !fs.existsSync(config.database.connection.filename);
} else {
  console.log('Connecting to PostgreSQL database...');
  config = require('../../config/db_pg');
}

const db = Bookshelf.initialize(config.database);

if (!process.env.testing) {

  /*
    When the application starts, it will check to see which migrations last ran
    and run any newer migrations. This will also load some base data if this is a
    new database.
   */
  db.knex.migrate.latest(config).then(function () {

    // if running sqlite3 in development on initial load, insert test data
    if(config.database.client === "sqlite3" && newDB) {

      var data = {
        submissions : require('../../test/fixtures/submissions'),
        submission_tags : require('../../test/fixtures/submission_tags'),

var Bookshelf = require('bookshelf');
var path = require('path');
// var SQLITE3 = require('../../creds/SQLITE3');

var db = Bookshelf.initialize({
  client: 'sqlite3',
  connection: {
    host: process.env.SQLITE3_HOST,
    user: process.env.SQLITE3_USER,
    password: process.env.SQLITE3_PASSWORD,
    database: process.env.SQLITE3_DATABASE,
    charset: 'utf8',
    filename: path.join(__dirname, 'storage/' + process.env.SQLITE3_DATABASE + '.sqlite')
  }
});

db.knex.schema.hasTable('users').then(function(exists) {
  if (!exists) {
    db.knex.schema.createTable('users', function(user) {
      user.increments('id').primary();
      user.string('username',255).unique();

var 
	path = require('path'),
	Bookshelf= require('bookshelf'),
	GistcampBookshelf,
	User
;

GistcampBookshelf = Bookshelf.initialize({
	client: 'sqlite3',
	connection: {
		filename: path.join(__dirname, '/data/gistcamp-dev.db')			
	}
});

GistcampBookshelf.User = GistcampBookshelf.Model.extend({
	tableName: 'users',
	hasTimestamps: true
});

GistcampBookshelf.Tag = GistcampBookshelf.Model.extend({

});

GistcampBookshelf.Following = GistcampBookshelf.Model.extend({

var fs = require('fs-extra'),
	path = require('path'),
	_ = require('underscore'),
	Bookshelf = require('bookshelf'),
	Promise = require('bluebird'),
	config = require('../config'),
	errors = require('../lib/errors'),
	dbConfig = config.db,
	syBookshelf = module.exports = Bookshelf.initialize(dbConfig),
	syModel = syBookshelf.Model,
	syCollection = syBookshelf.Collection;

syModel.include({
	tableName: '',
	fields: [],
	omitInJSON: [],
	appended: [],

	required: [],
	validators: {},
	fieldToAssets: {},

	initialize: function () {
		syModel.__super__.initialize.apply(this, arguments);
		this._data = {};

ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

var path = require('path');
var nconf = require('./config');

var conf = nconf.get('db');

conf.migrations = { directory: path.resolve(__dirname, '../migrations') };

var knex = require('knex').initialize(conf);
var bookshelf = require('bookshelf').initialize(knex);

exports.knex = knex;
exports.bookshelf = bookshelf;
exports.conf = conf;