Bookshelf circular dependency with ES5 - node.js

Question

I have the following code:
const bookshelf = require('../config/bookshelf');
const BaseModel = require('bookshelf-modelbase')(bookshelf);
const moment = require("moment");
const User = require("./User");
const Meta = require("./Meta");
const Log = require("./Log");
class Session extends BaseModel {
get tableName() {
return "sessions";
}
get hasTimestamps() {
return false;
}
user() {
return this.belongsTo(User);
}
meta() {
return this.belongsTo(Meta);
}
logs() {
return this.hasMany(Log);
}
};
module.exports = Session;
and
const bookshelf = require('../config/bookshelf');
const BaseModel = require('bookshelf-modelbase')(bookshelf);
const Session = require("./Session");
const moment = require("moment");
class Log extends BaseModel {
get tableName() {
return "logs";
}
get hasTimestamps() {
return false;
}
session() {
return this.belongsTo(Session);
}
getDate() {
return moment(this.get("date")).format("MMM DD, YYYY - HH:mm:ss")
}
};
module.exports = Log;
belongsTo relation works properly, but when I try hasMany, I get: "Unhandled rejection Error: A valid target model must be defined for the sessions hasMany relation" error.
I had a look at https://github.com/tgriesser/bookshelf/wiki/Plugin:-Model-Registry but it is being done using pre-ES5 syntax.
I guess I need to make sure "Log" class is available before I appoint into a hasMany relationship but stuck here.
Any ideas?
Edit: Doing
logs() {
var log = require("./Log");
return this.hasMany(log);
}
works but it looks bad.

Answer 1

You may use Bookshelf registry. It exactly fits your needs.
You can load Bookshelf registry plugin like this :
const knex = require('knex')({
client: 'pg',
connection: {
host: config.db_host,
user: config.db_user, // user name for your database
password: config.db_password, // user password
database: config.db_database, // database name
charset: 'utf8',
},
});
const bookshelf = require('bookshelf')(knex);
bookshelf.plugin('registry');
module.exports = {
knex,
bookshelf,
};
Then, register your models in module.exports like this :
module.exports = {
session: db.bookshelf.model('Session', Session),
log: db.bookshelf.model('Log', Log),
db,
};