How do I build a custom graphql query with support for Mongodb aggregations in Strapi? - graphql

Question

I tried building a custom graphql query with Strapi as per below:
module.exports = {
definition: `
type flatOnts {
site_name: String
unit_no: String
firstname: String
lastName: String
description: String
isp_name: String
serial_number: String
status: Boolean
}
`,
query: `
flattenOntObj: [flatOnts]
`,
type: {},
resolver: {
Query: {
flattenOntObj: {
description: "Return a flat ont object",
resolverOf: "application::onts.onts.aggregate",
resolver: async (obj, options, ctx) => {
const res = await strapi.api.onts.services.onts.aggregate([
{
$lookup: {
from: "onts",
localField: "ont",
foreignField: "_id",
as: "ont_details",
},
},
{
$replaceRoot: {
newRoot: {
$mergeObjects: [
{
$arrayElemAt: ["$ont_details", 0],
},
"$$ROOT",
],
},
},
},
]);
console.log(res);
},
},
},
},
};
However, upon running this in the Graphql playground, I am presented with the "forbidden" error.
Any ideas or pointers?
Appreciate any assistance.

Answer 1

Nevermind, I got it right. I missed a section on the Strapi documentation that explains it: https://strapi.io/documentation/3.0.0-beta.x/concepts/queries.html#custom-queries
In the folder: api/model/services/model.js (my case: api/onts/services/ont.js)
module.exports = {
aggregate: async (aggArray) => {
const res = await strapi.query("ont").model.aggregate(aggArray);
return res;
},
};
and then in api/onts/config/schema.graphql.js:
module.exports = {
definition: `
type flatOnts {
site_name: String
unit_no: String
firstname: String
lastName: String
description: String
isp_name: String
serial_number: String
status: Boolean
}
`,
query: `
flattenOntObj: [flatOnts]
`,
type: {},
resolver: {
Query: {
flattenOntObj: {
description: "Return a flat ont object",
// policies: ["plugins::users-permissions.isAuthenticated"],
resolverOf: "application::onts.onts.find",
resolver: async (obj, options, ctx) => {
const aggregationArray = [
{
$lookup: {
from: "onts",
localField: "ont",
foreignField: "_id",
as: "ont_details",
},
},
{
$replaceRoot: {
newRoot: {
$mergeObjects: [
{
$arrayElemAt: ["$ont_details", 0],
},
"$$ROOT",
],
},
},
];
const res = await strapi.api.onts.services.onts.aggregate(
aggregationArray
);
return res;
},
},
},
},
};