Find By ID and Remove From MongoDB array - node.js

Question

My Collection:
geoGraphicalFilter: {
aCountries: [String],
aCities: [String],
aCoordinates: [{
coordinates: { type: Array }
}]
}
CollectionData
"geoGraphicalFilter": {
"aCoordinates": [
{
"_id": ObjectId("5acb641d93fa0e52557fc6aa"),
"coordinates": [
[
72.42919972527011,
23.0437703991947
],
[
72.45031407464302,
23.045823913521474
],
[
72.43263295281557,
23.030500782775746
],
[
72.42919972527011,
23.0437703991947
]
]
},
{
"_id": ObjectId("5acb641d93fa0e52557fc6ac"),
"coordinates": [
[
72.51520207511979,
23.038241551175616
],
[
72.55399754632015,
23.03934733892872
],
[
72.51812031852671,
23.025129376064214
],
[
72.51520207511979,
23.038241551175616
]
]
},
{
"_id": ObjectId("5acb641d93fa0e52557fc6ad"),
"coordinates": [
[
72.44653752434493,
23.02828905299478
],
[
72.4896245299627,
23.02828905299478
],
[
72.45477727044641,
23.0194417709901
],
[
72.44653752434493,
23.02828905299478
]
]
},
{
"_id": ObjectId("5acb641d93fa0e52557fc6ab"),
"coordinates": [
[
72.47451832878957,
23.045350028380867
],
[
72.50576069939376,
23.04835127278581
],
[
72.47949650871226,
23.031606634051897
],
[
72.47451832878957,
23.045350028380867
]
]
}
],
"aCities": [],
"aCountries": []
}
Remove From Database Snippet
const deleteZones = (req,res,next) => {
var body = _.pick(req.body, ["zones"]);
var zoneList = body.zones;
debug(zoneList)
var promise = function() {
return new Promise(function(resolve, reject) {
zoneList.forEach(itemA => {
console.log(itemA.coordinates)
huntingModel.update(
{ _id: req.body.id },
{ $pull: { 'geoGraphicalFilter.aCoordinates': itemA.id} },
(error, success) => {
if (error) console.log(error);
console.log(success);
}
);
});
resolve();
});
};
promise().then(function() {
return res.status(200).jsonp({
message: adminMessages.succ_zone_removed
});
});
}
Now the scenario is like when I am trying to delete data it shows success message but data does not get deleted.
var object = {
id:this.id,
zones: this.zonesDelete // Contains list of id
};
I am getting object in a requested body and I want to find the document from a collection and delete the particular array element by finding an id in geoGraphicalFilter.aCoordinates and wants to remove it.

Answer 1

As per documentation of $pull operator you can either specify a value or a condition
i.e.
{ $pull: { <field1>: <value|condition>, <field2>: <value|condition>, ... } }
In your scenario you need to either specify complete value of one or more aCoordinates item object or an condition that matches one or more aCoordinates item
Add the condition where you match id of aCoordinates item i.e.
Use following pull condition to solve the issue:
huntingModel.update(
{ _id: req.body.id },
{ $pull: { 'geoGraphicalFilter.aCoordinates': {'_id' : ObjectId(itemA.id)}} },
(error, success) => {
if (error) console.log(error);
console.log(success);
}
);