Suppose we have 10 collection, then we have to find the count on the basis of tag_id. For example, if tag_id contains 0 and 1, then we have to count all the data, as well as counting the data that don't have tag_id, or where tag_id is null. Then if it has unread : false then the output comes, count of all the unread.
Find the counts of tag_id and counts of unread when false.
{
"_id": ObjectId("5912c7240520df77f0c2c18a"),
"email_id": "54",
"unread": "false",
"__v": NumberLong(0),
"tag_id": ["0"
]
}, {
"_id": ObjectId("5912c71e0520df77f0c2c189"),
"email_id": "55",
"unread": "false",
"__v": NumberLong(0),
"tag_id": [
"1"
]
}, {
"_id": ObjectId("5912c71d0520df77f0c2c186"),
"email_id": "51",
"unread": "false",
"__v": NumberLong(0),
"tag_id": [
"2", "1"
]
}
expected result:
{
"data": [{
"tag_id": "1",
"count_email": 1,(count of email on the basis of tag_id)
"unread": 9(count the unread on the basis of output of tag_id)
}, {
"tag_id": "3",
"count_email": 45,
"unread": 3
}, {
"tag_id": "2",
"count_email": 5,
"unread": 4
}, {
"id": null,
"count_email": 52,
"unread": 35
}]
}
via Shekhar Tyagi
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