Strongloop PostgreSQL connector embedded model error - loopbackjs

Question

Got a simple Loopback API to retrieve tickets and responses using the postgreSQL connector. Tickets and responses come back fine individually but when I try to embed the responses into the ticket model I get the error below. I have tried following the documentation and I'm sure it's something simple in one of my relations that I'm missing but whatever I try, I cannot get it to work.
Any help would be appreciated.
https://docs.strongloop.com/display/public/LB/Embedded+models+and+relations#Embeddedmodelsandrelations-EmbedsMany
Ticket Model:
{
"name": "Ticket",
"base": "PersistedModel",
"idInjection": true,
"options": {
"postgresql": {
"schema": "customer_service",
"table": "tbl_ticket"
}
},
"properties": {
"description": {
"type": "String",
"required": true,
"length": null,
"precision": null,
"scale": null,
"postgresql": {
"columnName": "description",
"dataType": "text",
"dataLength": null,
"dataPrecision": null,
"dataScale": null,
"nullable": "NO"
}
},
"id": {
"type": "Number",
"id": 1,
"required": true,
"length": null,
"precision": 32,
"scale": 0,
"postgresql": {
"columnName": "id",
"dataType": "integer",
"dataLength": null,
"dataPrecision": 32,
"dataScale": 0,
"nullable": "NO"
}
}
},
"validations": [],
"relations": {
"responses": {
"type": "embedsMany",
"model": "Response",
"property": "embededResponses",
"options": {
"validate": true,
"forceId": false
}
}
},
"acls": [],
"methods": {}
}
Response Model:
{
"name": "Response",
"base": "PersistedModel",
"idInjection": true,
"options": {
"postgresql": {
"schema": "customer_service",
"table": "tbl_response"
}
},
"properties": {
"notes": {
"type": "String",
"required": false,
"length": null,
"precision": null,
"scale": null,
"postgresql": {
"columnName": "notes",
"dataType": "text",
"dataLength": null,
"dataPrecision": null,
"dataScale": null,
"nullable": "YES"
}
},
"ticketId": {
"type": "Number",
"required": true,
"length": null,
"precision": 32,
"scale": 0,
"postgresql": {
"columnName": "ticket_id",
"dataType": "integer",
"dataLength": null,
"dataPrecision": 32,
"dataScale": 0,
"nullable": "NO"
}
},
"id": {
"type": "Number",
"id": 1,
"required": true,
"length": null,
"precision": 32,
"scale": 0,
"postgresql": {
"columnName": "id",
"dataType": "integer",
"dataLength": null,
"dataPrecision": 32,
"dataScale": 0,
"nullable": "NO"
}
}
},
"validations": [],
"relations": {
"ticket": {
"type": "belongsTo",
"model": "Ticket",
"foreignKey": "ticketId"
}
},
"acls": [],
"methods": {}
}
Error:
{
"error": {
"name": "error",
"status": 500,
"message": "column \"embededresponses\" does not exist",
"length": 126,
"severity": "ERROR",
"code": "42703",
"position": "213",
"file": ".\\src\\backend\\parser\\parse_expr.c",
"line": "766",
"routine": "transformColumnRef",
"stack": "error: column \"embededresponses\" does not exist\n at Connection.parseE (C:\\WebApp\\node_modules\\loopback-connector-postgresql\\node_modules\\pg\\lib\\connection.js:539:11)\n at Connection.parseMessage (C:\\WebApp\\node_modules\\loopback-connector-postgresql\\node_modules\\pg\\lib\\connection.js:366:17)\n at Socket.<anonymous> (C:\\WebApp\\node_modules\\loopback-connector-postgresql\\node_modules\\pg\\lib\\connection.js:105:22)\n at Socket.emit (events.js:107:17)\n at readableAddChunk (_stream_readable.js:163:16)\n at Socket.Readable.push (_stream_readable.js:126:10)\n at TCP.onread (net.js:538:20)"
}
}

Answer 1

Your Ticket model should have the following relationship section:
"relations": {
"Responses": {
"type": "hasMany",
"model": "Response",
"foreignKey": "ticketId"
}
}
Your Response model relationship is correct.
It's not very clear from the docs that the embed relationships are for NoSQL databases. For traditional SQL databases, use the Has* relationship types.
To retrieve a Ticket with Responses from the REST API use the include filter: https://docs.strongloop.com/display/public/LB/Include+filter.
Example: localhost:3000/api/Tickets/{id}?filter[include]=responses

Answer 2

I am told that you can use embedded relations with SQL data sources, but the data is then stored in stringified-JSON format.
I've added a note to https://docs.strongloop.com/display/LB/Embedded+models+and+relations.
Rand