Mongoose, update of child will affect all parents? - node.js

Question

What is the query to update below data with mongoose. So 3 fields are going to be updated. Top Parent Points, Categories Points and Tag Points.
{
"_id": "561fba5e7fac41a4055fad45",
"fullName": "Test",
"points": 45,
"level": 1,
"categories": [
{
"name": "Computer Science",
"points": 15,
"level": 1,
"_id": "561fba5e7fac41a4055fad46",
"tags": [
{
"name": "C#",
"points": 10,
"level": 1,
"_id": "561fba5e7fac41a4055fad47"
},
{
"name": "Java",
"points": 5,
"level": 1,
"_id": "561fba5e7fac41a4055ert12"
}
]
},
{
"name": "History",
"points": 30,
"level": 2,
"_id": "562407d4e3edf2113f61ac37",
"tags": [
{
"name": "WW2",
"points": 30,
"level": 2,
"_id": "56240797e3edf2113f61ac36"
}
]
}
]
}
to this one. When user gets a point from a specific tag, it will effect all parents. Let's say, user gets 10 points from C# then i have to update mongodb to this.
{
"_id": "561fba5e7fac41a4055fad45",
"fullName": "Test",
**"points": 55,**
"level": 1,
"categories": [
{
"name": "Computer Science",
**"points": 25,**
"level": 1,
"_id": "561fba5e7fac41a4055fad46",
"tags": [
{
"name": "c#",
**"points": 20,**
"level": 1,
"_id": "561fba5e7fac41a4055fad47"
},
{
"name": "Java",
"points": 5,
"level": 1,
"_id": "561fba5e7fac41a4055ert12"
}
]
},
{
"name": "History",
"points": 30,
"level": 2,
"_id": "562407d4e3edf2113f61ac37",
"tags": [
{
"name": "WW2",
"points": 30,
"level": 2,
"_id": "56240797e3edf2113f61ac36"
}
]
}
]
}

Answer 1

you should use $elemMatch for querying your object
db.tests.update({_id: yourTestId, categories: {$elemMatch: {_id: categoryId}}}, {$set: {$inc: {"categories.$.points": 10, points: 10}}})
So you querying only needed array element and update it values with $ reference