Hello
The bellow does
1)Add new book
if no books array,or new category
2)else new member on add bookinfo
*uses pipeline update so need mongodb >=4.2
Change those to the query below,use variables
newBook needs to have this structure for code to work,else change the code also
NewBook
"newBook": {
"Name": "xxx2",
"Auth": "xxx2",
"Category": 2
}
UserID
"q": {
"UserId": 1
}
What it does
if books doesnt exists adds books have only the newbooks
else
reduce on the books array,to updated books-array
if category exists
add to bookinfo
else if i found the end and i dindt added yet(new category)
add new-book to books
It does it with one array read
{
"update": "testcoll",
"updates": [
{
"q": {
"UserId": 1
},
"u": [
{
"$addFields": {
"Books": {
"$let": {
"vars": {
"newBook": {
"Name": "xxx2",
"Auth": "xxx2",
"Category": 2
}
},
"in": {
"$cond": [
{
"$not": [
{
"$ne": [
{
"$type": "$Books"
},
"missing"
]
}
]
},
[
{
"Category": "$$newBook.Category",
"BookInfos": [
{
"Name": "$$newBook.Name",
"Auth": "$$newBook.Auth"
}
]
}
],
{
"$arrayElemAt": [
{
"$reduce": {
"input": "$Books",
"initialValue": [
[],
0,
false
],
"in": {
"$let": {
"vars": {
"booksIndexAdded": "$$value",
"book": "$$this"
},
"in": {
"$let": {
"vars": {
"books": {
"$arrayElemAt": [
"$$booksIndexAdded",
0
]
},
"index": {
"$arrayElemAt": [
"$$booksIndexAdded",
1
]
},
"added": {
"$arrayElemAt": [
"$$booksIndexAdded",
2
]
}
},
"in": {
"$cond": [
{
"$eq": [
"$$book.Category",
"$$newBook.Category"
]
},
[
{
"$concatArrays": [
"$$books",
[
{
"$mergeObjects": [
"$$book",
{
"BookInfos": {
"$concatArrays": [
"$$book.BookInfos",
[
{
"Name": "$$newBook.Name",
"Auth": "$$newBook.Auth"
}
]
]
}
}
]
}
]
]
},
{
"$add": [
"$$index",
1
]
},
true
],
{
"$cond": [
{
"$and": [
{
"$eq": [
"$$index",
{
"$subtract": [
{
"$size": "$Books"
},
1
]
}
]
},
{
"$not": [
"$$added"
]
}
]
},
[
{
"$concatArrays": [
"$$books",
[
"$$book",
{
"Category": "$$newBook.Category",
"BookInfos": [
{
"Name": "$$newBook.Name",
"Auth": "$$newBook.Auth"
}
]
}
]
]
},
{
"$add": [
"$$index",
1
]
},
true
],
[
{
"$concatArrays": [
"$$books",
[
"$$book"
]
]
},
{
"$add": [
"$$index",
1
]
},
"$$added"
]
]
}
]
}
}
}
}
}
}
},
0
]
}
]
}
}
}
}
}
],
"upsert": true,
"multi": true
}
]
}
Before update
New user
New category old user
Old category old user
