How to create a reference in loopback? - mongodb

Question

I'm new with loopback and I have some issues with relations.
I have these two models:
course
{
"name": "course",
"plural": "courses",
"base": "PersistedModel",
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {
"toughtBy":{
"type": "embedsMany",
"model": "teacher",
"foreignKey":"",
"options": {
"validate": true,
"forceId": false
}
},
"acls": [],
"methods": {}
}
teacher
{
"name": "teacher",
"plural": "teachers",
"base": "PersistedModel",
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string",
"required": true
},
"lastName": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {},
"acls": [],
"methods": []
}
How can I add a existing teacher in an existing course ?
I tried a use the API put /courses/{id}/toughtBy/{fk}, but I get an empty body.

Answer 1

To confirm but I believe you did not create a course first prior to calling
POST api/courses/1/thoughtBy/1, thus you are trying to update a related model instance from a model instance that doesn't exists.
By the way, rather than using course embedsMany teacher, I would recommend you use the following patter:
course hasAndBelongsToMany teacher
then use
POST api/courses/ to create a course
POST api/teachers to create a teacher
POST api/courses/link/ with teacherid=1 and courseid=1 to link the both