Need to count distinct tags on all registers in a mongodb query, using JS.
Register structure:
{
"_id": {
"$oid": "62e593aed8fd9808777225e8"
},
"title": "“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”",
"author": {
"name": "Albert Einstein",
"url": "https://quotes.toscrape.com/author/Albert-Einstein"
},
"tag": [
"change",
"deep-thoughts",
"thinking",
"world"
]
}
This could be useful. In addition to get the different values for the field, it returns the number of appearances:
db.collection.aggregate([
{
"$unwind": "$tag"
},
{
"$group": {
"_id": "$tag",
"total": {
"$sum": 1
}
}
},
])
You can try here: https://mongoplayground.net/p/yXLYkJKO3Wf