Beimnet w4 database #52
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| const aggCursor = await collection.aggregate([ | ||
| { | ||
| $match: { |
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Well done @beimnet. We are almost there.
The question is asking us to "Write a function that will return all the information of each continent for a given Year and Age". If you compare your current solutions to the expected output, you will noticed they are not the same. This means in our match, we need to include all the continents (in field named Country) not all the countries. We can update our code to look as follows in the getTotalPopulationByContinent(year, age) and we can remove the commented lines:
...
const aggCursor = await collection.aggregate([
{
$match: {
Country: {
$in: [
"AFRICA",
"ASIA",
"EUROPE",
"LATIN AMERICA AND THE CARIBBEAN",
"NORTHERN AMERICA",
"OCEANIA",
],
},
Year: year,
Age: age,
},
},
{
$addFields: {
TotalPopulation: {
$add: [{ $toInt: '$M' }, { $toInt: '$F' }],
},
},
},
// {
// $group: {
// _id: '$Country',
// Year: { $first: '$Year' },
// Age: { $first: '$Age' },
// M: { $sum: '$M' },
// F: { $sum: '$F' },
// TotalPopulation: { $sum: '$TotalPopulation' },
// },
// },
// { $sort: { _id: 1 } },
]);
....
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| const result = await aggCursor.toArray(); | ||
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| console.log(result); |
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We can remove this line console.log(result); since we are using another console.log() in line 35.
| 'OCEANIA', | ||
| ], | ||
| }, | ||
| year: year, |
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The key should be Capital letter Y as in Year: year, not year: year and same for age as Age: age.
It is always good to try to test our code when we make changes.
| const aggCursor = await collection.aggregate([ | ||
| { | ||
| $match: { | ||
| country: { |
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The key should be Capital letter C as in Country: not country:
It is always good to test our code when we make changes - this way we can know if everything is working as it should.
| }, | ||
| }, | ||
| { | ||
| $group: { |
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I mentioned this in my previous review. We don't need to include line 33 to 42. We can remove it.
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| const result = await aggCursor.toArray(); | ||
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| console.log(result); |
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I mentioned this in my previous review as well, we can remove line 47 console.log(result); since you log the result on line 58.
| const uri = process.env.MONGODB_URI; | ||
| const client = new MongoClient(uri); | ||
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| export async function connectToDatabase() { |
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Well done @beimnet11, I will approve it now. Congratulations on completing this module - Great job.
One last thing, apologies I keep forgetting this. Since we export both functions connectToDatabase and disconnectFromDatabase on line 23, we don't have to use the export keyword. We can remove the export in front of both functions line 8 & 18. So both will look like:
async function connectToDatabase() {
try {
await client.connect();
console.log('Connected to MongoDB');
return client.db('databaseWeek4');
} catch (error) {
console.error('Failed to connect to MongoDB', error);
process.exit(1);
}
}
async function disconnectFromDatabase() {
await client.close();
console.log('Disconnected from MongoDB');
}
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Congratulations @beimnet11 on completing the Database module 👏🙌. Rooting for you all. Success with the rest of the programme. |
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@beimnet11 Approved now. Thank you |
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