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Fixes in arrays and count
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‎docs/40-using-arrays/10-types-of-arrays.mdx

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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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# 👐 Types of arrays
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A JSON array can contain __scalar values__ or __objects__. In our data, `books` have a scalar array of the `genres` this book belongs to. It also has several arrays of objects, like the `authors` of a book, `attributes` and `reviews`.
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Let's get one book:
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<Tabs groupId="aggregations">
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<TabItem value="atlas" label="Atlas UI">
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Remember to select the `books` collection in the UI.
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```js
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[
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{ $limit: 1 }
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]
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```
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</TabItem>
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<TabItem value="mongodb-shell" label="MongoDB Shell">
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```js
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db.books.aggregate([
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{ $limit: 1 }
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])
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```
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</TabItem>
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</Tabs>
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👐 Run this aggregation to get one book.
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I got this one. (It can change depending on the data source you imported.)
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```js
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[
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{
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"_id": "0002005018",
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"title": "Clara Callan: A novel",
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"authors": [
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{
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"_id": "64cc2db4830ba29148da4c3b",
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"name": "Richard Bruce Wright"
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}
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],
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"genres": [
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"Women Teachers",
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"Young Women",
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"Actresses",
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"Sisters"
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],
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"pages": 414,
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"year": 2001,
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"synopsis": "Giller Prize Winner 2001. Richard B. Wright. A Phyllis Bruce Book.",
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"cover": "https://images.isbndb.com/covers/50/12/9780002005012.jpg",
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"attributes": [
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{
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"key": "edition",
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"value": "1st"
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},
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{
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"key": "dimensions",
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"value": "Height: 11.11 Inches, Length: 6.11 Inches, Weight: 1 Pounds, Width: 1.11 Inches"
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},
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{
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"key": "isbn13",
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"value": "9780002005012"
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},
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{
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"key": "msrp",
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"value": "0.00"
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},
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{
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"key": "isbn",
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"value": "0002005018"
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},
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{
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"key": "isbn10",
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"value": "0002005018"
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}
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],
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"totalInventory": 2,
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"available": 2,
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"binding": "Hardcover",
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"language": "en",
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"publisher": "HarperFlamingoCanada",
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"longTitle": "Clara Callan: A novel",
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"reviews": [
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{
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"_id": {
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"$oid": "6526bbc2e4e804888dfedf37"
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},
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"text": "yd",
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"name": "Holy Dingo",
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"rating": 1,
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"timestamp": 1697037250625
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},
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{
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"_id": {
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"$oid": "651c0f4b24193d51c4c734a3"
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},
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"text": "Great!",
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"name": "Brash Platypus",
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"rating": 5,
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"timestamp": 1696337739128
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}
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]
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}
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]
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```

‎docs/40-using-arrays/20-simple-match-array.mdx

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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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# 👐 Scalar arrays
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## 👐 Get all the Science Fiction Books
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Can I get all books for genre `Science Fiction`?. Turns out it's quite simple:
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<Tabs groupId="aggregations">
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<TabItem value="atlas" label="Atlas UI">
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```js
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[
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{
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$match: {
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genres: 'Science Fiction'
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}
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}
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]
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```
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</TabItem>
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<TabItem value="mongodb-shell" label="MongoDB Shell">
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```js
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db.books.aggregate([
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{
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$match: {
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genres: 'Science Fiction'
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}
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}
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])
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```
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</TabItem>
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</Tabs>
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Remember that will include any book that has any other genre as long as it has `Science Fiction` in `genres`.
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## 👐 Find all the books that belong only to the genres "Fiction" and "Science Fiction"
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In this case, we want books that have both "Fiction" and "Science Fiction" in the genres array _and nothing else_.
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<Tabs groupId="aggregations">
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<TabItem value="atlas" label="Atlas UI">
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```js
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[
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{
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$match: {
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genres: ['Fiction', 'Science Fiction']
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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]
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```
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</TabItem>
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<TabItem value="mongodb-shell" label="MongoDB Shell">
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```js
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db.books.aggregate([
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{
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$match: {
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genres: ['Fiction', 'Science Fiction']
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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])
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```
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</TabItem>
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</Tabs>
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Here we're comparing the whole array. __Elements order is important__. With this comparison you'll get nothing in return:
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<Tabs groupId="aggregations">
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<TabItem value="atlas" label="Atlas UI">
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```js
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[
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{
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$match: {
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genres: ['Science Fiction', 'Fiction']
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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]
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```
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</TabItem>
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<TabItem value="mongodb-shell" label="MongoDB Shell">
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```js
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db.books.aggregate([
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{
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$match: {
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genres: ['Science Fiction', 'Fiction']
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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])
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```
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</TabItem>
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</Tabs>
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## 👐 Find all the books that belong at least to the genres "Fiction" and "Science Fiction"
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If you want to search for all books that have "Fiction" and "Science Fiction", in any order (and possibly other genres) use:
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<Tabs groupId="aggregations">
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<TabItem value="atlas" label="Atlas UI">
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```js
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[
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{
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$match: {
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genres: {$all: ['Science Fiction', 'Fiction'] }
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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]
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```
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</TabItem>
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<TabItem value="mongodb-shell" label="MongoDB Shell">
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```js
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db.books.aggregate([
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{
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$match: {
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genres: {$all: ['Science Fiction', 'Fiction'] }
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}
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},
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{$project: {
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title: 1,
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genres: 1
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}}
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])
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```
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</TabItem>
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</Tabs>

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