Where filter with HasAndBelongsToMany relation in Loopback - loopback

Question

first of all I am sorry if this has been asked 1st, I searched for this and got few links but wasn't helpful.
I am working on simple chat application created in Angular 4 which has Customer entity and Conversation entity and Message. In The customer => hasAndBelongsToMany => Conversation with MongoDb Connector.
In customer.json
"relations": {
"conversations": {
"type": "hasAndBelongsToMany",
"model": "Conversation"
}
}
In conversation.json
"relations": {
"customers": {
"type": "hasAndBelongsToMany",
"model": "Customer"
}
}
This creates table customerconversation which contains conversationId and customerId
Now basically I want to find conversation for two customer Ids, So I tried following filters but it doesn't seem to work and always returns empty array even though there is conversation having these two customer ids.
let filter = {
where: {
and: [
{
customers: {
inq: [
this.customerId // = 59bb981f35fcc941e8ba64e4
]
}
},
{
customers: {
inq: [
this.authService.getCurrentId() // = 59bb98c735fcc941e8ba68ff
]
}
}
]
}
};
and another without and operator
let filter = {
where: {
customers: {
inq: [
this.customerId, // 59bb981f35fcc941e8ba64e4
this.authService.getCurrentId() // 59bb98c735fcc941e8ba68ff
]
}
}
};
These both returns customer with mentioned Id but with 0 conversations. I know I can get all conversations of specific customer by using include filter for conversations but still those would need to be filtered as I want single conversation of this customer with another specific customer.

Answer 1

You can get the information by grabbing the customer first and then using the relations and include to get the data you need.
Example is based on the assumption that you are writing this using typescript & loopback-sdk-builder on an angular application.
this.customerApi
.getConversations(this.authService.getCurrentId(), {
where: {
customerId: this.customerId
})
.subscribe(result => {
// your logic here
})