How to create many to many relationship between models in loopback? - node.js

Question

I might be missing something obvious here but have spent hours on this and unable to find a solution.
Suppose I have an employee model
"properties": {
"name": {
"type": "string",
"required": true
},
"age": {
"type": "number",
"required": true
}
};
and its child model
"properties": {
"Code": {
"type": "string",
"required": true
},
"Desc": {
"type": "string",
"required": true
}
}
How do I create a many to many relationship between them?

Answer 1

You can add accepted properties passing accepts fields to remoteMethod options.
Read this page in the documentation.
module.exports = function(Task) {
fs.readdir(PATH_PROCESS+PATH_API, (err, o) => {
for(var c in o){
var i = o[c];
Task[i] = require(PATH_PROCESS+i+".js").lpb;
Task.remoteMethod(
    i, {
http: {path: ('/'+i), verb: 'post'},
returns: {arg: 'result', type: 'object'},
accepts: [
{arg: 'params', type: 'object', required: true, http: {source: 'body'},
description: (i+' params.')}
]
    }
    );
}
});
};

Answer 2

From the docs:
A hasManyThrough relation sets up a many-to-many connection with another model. This relation indicates that the declaring model can be matched with zero or more instances of another model by proceeding through a third model.
Use slc loopback:relation command to create relations between models. Don't forget to add through model when prompted (also explained in docs).
After you create relation between your models you will have to synchronize your changes with database using automigrate() or autoupdate().
Be careful when using automigrate because it will create or re-create your database which means that you can potentially loose your data.