Find with arrayFilters using Mongoose - node.js

Question

I have to filter the object which contains only status C in comments(If atleast only comment have the status C then that object alone should be print) I tried using array Filters but I don't get exact result
{
"_id" : ObjectId("5b8f84379f432a42383a85bb"),
"projectID" : ObjectId("00000000e614c33390237ce3"),
"inspection_data" : [
{
"locationAspects" : [
{
"aspectname" : "Ground floor",
"comments" : [
{
"status" :"C",
"comment" : [
"good"
],
"_id" : ObjectId("5b8f84379f16400f884d9974")
}
],
"_id" : ObjectId("5b8f84379f16400f884d9975")
},
{
"aspectname" : "Second floor",
"comments" : [
{
"status" :"P",
"comment" : [
"nothing"
],
"_id" : ObjectId("5b8f84379f16400f884d9971")
}
],
"_id" : ObjectId("5b8f84379f16400f884d9972")
},
],
"published_date" : ISODate("2018-09-05T07:22:31.017Z"),
"_id" : ObjectId("5b8f84379f16400f884d9976")
},
{
"locationAspects" : [
{
"aspectname" : "Ground floor",
"comments" : [
{
"status" :"P",
"comment" : [
"good"
],
"_id" : ObjectId("5b8f84379f16400f884d9974")
}
],
"_id" : ObjectId("5b8f84379f16400f884d9975")
}
],
"published_date" : ISODate("2018-09-05T07:22:31.017Z"),
"_id" : ObjectId("5b8f84379f16400f884d9976")
}
]
Now the inspection data having two object but one object only containing comment status c, So That should be print
Expected Result
[ {
"locationAspects" : [
{
"aspectname" : "Ground floor",
"comments" : [
{
"status" :"C",
"comment" : [
"good"
],
"_id" : ObjectId("5b8f84379f16400f884d9974")
}
],
"_id" : ObjectId("5b8f84379f16400f884d9975")
},
{
"aspectname" : "Second floor",
"comments" : [
{
"status" :"P",
"comment" : [
"nothing"
],
"_id" : ObjectId("5b8f84379f16400f884d9971")
}
],
"_id" : ObjectId("5b8f84379f16400f884d9972")
},
],
"published_date" : ISODate("2018-09-05T07:22:31.017Z"),
"_id" : ObjectId("5b8f84379f16400f884d9976")
}]
Above object only having the status C if alteast one comment status is C that object alone have to display

Answer 1

You need $filter to process inspection_data. Things are getting complicated since you have multiple levels of nestings, so before you can apply $in condition you need to get an array of all statuses for single inspection_data. To achieve that you can use direct path like "$$data.locationAspects.comments.status" but it returns an array of arrays like this:
[ [ "C" ], [ "P" ] ], [ [ "P" ] ] ]
So you have to flatten that array and that can be achieved using $reduce and $concatArrays. Try:
db.col.aggregate([
{ $match: { projectID: ObjectId("00000000e614c33390237ce3") } },
{
$project: {
filtered_inspection_data: {
$filter: {
input: "$inspection_data",
as: "data",
cond: {
$let: {
vars: {
statuses: {
$reduce: {
input: "$$data.locationAspects.comments.status",
initialValue: [],
in: { $concatArrays: [ "$$this", "$$value" ] }
}
}
},
in: { $in: [ "C", "$$statuses" ] }
}
}
}
}
}
}
])
EDIT: to match "C" or "P" you can use replace { $in: [ "C", "$$statuses" ] } with following line
{ $or: [ { $in: [ "C", "$$statuses" ] }, { $in: [ "P", "$$statuses" ] } ] }