loopback hasandbelongstomany relation table doesn't exist - node.js

Question

I have defined two models:
a 'part' model:
{
"name": "part",
"base": "PersistedModel",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"name": {
"type": "string"
}
},
"validations": [],
"relations": {
"assemblies": {
"type": "hasAndBelongsToMany",
"model": "assembly",
"foreignKey": ""
}
},
"acls": [],
"methods": {}
}
and an 'assembly' models:
{
"name": "assembly",
"base": "PersistedModel",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"title": {
"type": "string",
"required": true
}
},
"validations": [],
"relations": {
"parts": {
"type": "hasAndBelongsToMany",
"model": "part"
}
},
"acls": [],
"methods": {}
}
both models have an hasAndBelongToMany relation.
In a /server/boot/sample-model.js i have created some instance of this both models:
module.exports = function(app){
var Dev = app.dataSources.dev;
var Customer = app.models.customer;
var Order = app.models.order;
var Part = app.models.part;
var Assembly = app.models.assembly;
Dev.automigrate(['customer', 'order', 'assembly', 'part'], function(err) {
Customer.create([
{name: 'nicolas'},
{name: 'marie'},
{name: 'cyril'}
], function(err, customers){
Part.create([
{name: 'boulon'},
{name: 'ecrou'},
{name: 'cheville'},
], function(err, part){
//console.log(part[0])
Assembly.create([
{title: 'piece1'},
{title: 'piece2'},
{title: 'piece3'},
], function(err, assemblies){
//console.log(assemblies[0])
assemblies[0].parts.add(part[0], function(err){
if(err){
console.log(err)
}
})
})
})
});
});
}
but
assemblies[0].parts.add(part[0], function(err){
if(err){
console.log(err)
}
})
end with error:
{ [Error: ER_NO_SUCH_TABLE: Table 'database_development.assemblypart' doesn't exist]
code: 'ER_NO_SUCH_TABLE',
errno: 1146,
sqlState: '42S02',
index: 0 }
why loopback doesn't create the assemblypart table in my database ?

Answer 1

I ran into this same issue once and after many hours of struggling (using postgres connector), I've found several solutions.
Here's the shortest :
Instead of :
Dev.automigrate(['customer', 'order', 'assembly', 'part'], function(err) {
// Your code here
});
Try using this :
Dev.automigrate()
.then(function(err) {
// Your code here
});
I don't know exactly why, but in the second case the junction table is created.
Can you try this and let me know if it works for you ? If it's not can you provide some place where I can inspect and try running your code ?