As title suggests, I have this document structure:
{
"_id":ObjectId("61e53553ac31665894ebf6bc"),
"questionID":"8",
"questionContent":"find it",
"questoinAnswer":"it's here",
"questionStatus":"active",
"questionImage":"some image",
"hints":[
{
"hintID":"1",
"hintSubject":"in you pucket",
"hintContent":"bla bla bla",
"hintType":"private",
"hintStatus":"Active",
"time":"2022-01-23 11:02:41.976391"
},
{
"hintID":"2",
"hintSubject":"red sea",
"hintContent":"bla bla bla",
"hintMedia":"some media",
"hintType":"puplic",
"hintStatus":"Active",
"time":"2022-01-23 11:05:47.567226"
}
]
}
I want to retrieve only the values of hintSubject if the hintType is free and hintStatus is active and put it into a list
CodePudding user response：
Use the below aggregation query where list of hintSubject is stored in hintSubject key in root dictionary key.
from pymongo import MongoClient
c = MongoClient()
db = c["db_name"]
col = db["sample_collection"]
for x in col.aggregate([
{
"$addFields": {
"hintSubject": {
"$reduce": {
"input": "$hints",
"initialValue": [],
"in": {
"$concatArrays": [
"$$value",
{
"$cond": {
"if": {
"$and": [
{
"$eq": [
"$$this.hintType",
"free"
]
},
{
"$eq": [
"$$this.hintStatus",
"Active"
]
},
]
},
"then": [
"$$this.hintSubject"
],
"else": [],
},
},
],
},
},
}
}
}
])
print(x["hintSubject"])