I'm using Mongo DB and I have a list of object that I need to group in category -> subcategory -> different types of subcategory grouped together. You can find the code in this mongodb playground > https://mongoplayground.net/p/BfR7FT28XKN
I create the group category -> all the sub category. But how can I group the subcategory with the same name?
My goal is to achieve something like that:
{
"_id": "Food and Drink",
"subCategories": [
{
"details": "Wine Bar",
"subCategory": "Bar",
},
{
"details": "Jazz and Blues Cafe",
"subCategory": "Nightlife",
},
{
"subCategory": "Restaurants",
"types": [
{
"details": "Mediterranean",
"subCategory": "Restaurants",
},
{
"details": "Mexican",
"subCategory": "Restaurants",
}
]
},
]
}
Thanks
Here's what you need. You need to group by both category and sub category first. I have pushed complete document in types. You can filter the fields or do changes as per your requirements.
[{
"$match": {
"category": {
"$ne": null
},
"subCategory": {
"$ne": null
}
}
},
{
$group: {
_id: {
cat: "$category",
sub: "$subCategory",
},
docs: {
$push: "$$ROOT"
}
}
},
{
$group: {
_id: "$_id.cat",
subCategories: {
$push: {
subCategory: "$_id.sub",
types: "$docs"
}
}
}
}]
Remove types: "$docs" from last stage and this is what you'd get
[{
"_id": "Community",
"subCategories": [
{
"subCategory": "Education"
},
{
"subCategory": "Disabled Persons Services"
}
]
},
{
"_id": "Food and Drink",
"subCategories": [
{
"subCategory": "Bar"
},
{
"subCategory": "Nightlife"
},
{
"subCategory": "Restaurants"
}
]
}]
Playground https://mongoplayground.net/p/nwyAivJOZj5