not able to save document with ref mongoose - node.js

Question

I can't save my insert
MY MODELS :
Action and Type_intervention
var mongoose = require("mongoose"),
Schema = mongoose.Schema;
var actionSchema = new Schema({
action: {
type: String,
required: true,
unique: true
},
}); //Exporter le model
module.exports = mongoose.model('Action', actionSchema);
/*-----------------------------------------*/
var mongoose = require("mongoose"),
Schema = mongoose.Schema;
var type_interventionSchema = new Schema({
type_name_intervention : {type : String},
libelle : {type : String},
Standart : {type : String},
libelle_crt : {type : String},
action : {type: Schema.ObjectId, ref: 'Action'},
});
//Exporter le model
module.exports = mongoose.model('Type_intervention',type_interventionSchema);
/*--------------------------------------*/
MY CONTROLLER:
var new_type_intervention = new Type_intervention({
type_name_intervention: req.body.type_name_intervention,
libelle: req.body.libelle,
Standart: req.body.Standart,
libelle_crt: req.body.libelle_crt,
action: req.body.action,
})
new_type_intervention.save((err, newinter) => {
if (err) {
return res.send({
message: 'Error when try to save',
'intervention': new_type_intervention,
'req.action': req.body.action,
'new_type_intervention_action': new_type_intervention.action
});
}
return res.send({
message: 'Add with succes',
'intervention': new_type_intervention
})
})
POSTMAN RUN : The error is catched (new_intervention.action not apear and there type is undefined !? )
I think this is a probleme
{ "type_name_intervention":"f",
"libelle":"f",
"Standart":"f",
"libelle_crt":"f",
"action":"test"}
//Results:
{
"message": "Error when try to save",
"intervention": {
"type_name_intervention": "f",
"libelle": "f",
"Standart": "f",
"libelle_crt": "f",
"_id": "591eb2ccd4325d0e40b2d038"
},
"req.body.action": "test",
"type of new_type_intervention_action": "undefined"
}

Answer 1

I found the solution :
Before save : i try to find the action_id
Action.findOne({
'action': req.body.action,
})
.exec(function (err, found_action) {
if (found_action) {
new_type_intervention.action=found_action._id; // This is GOOD practice
new_type_intervention.save();
return res.send({
'type': typeof req.body.action,
message: 'type intervention ajoutee avec succes '
})
}
})