Category = collection.find({},{ name: true }).toArray();
console.log("Categories Found", Category);
Output:
Promise { [
{ name: 'Agriculture' },
{ name: 'engineer' }
] }
How do I get the value of name? (NOTE: Working in node JS)
toArray is an asynchronous function that returns a promise. You can get your categories in one of two ways:
Promise style:
collection.find({},{ name: true }).toArray()
.then(categories => {
console.log(categories);
});
Callback style:
collection.find({},{ name: true }).toArray((err, categories) => {
console.log(categories);
});
Of course, it is a good practice to have some error handling: add .catch to the promise chain, or check if err is truthy in the callback.
Since you get back a promise, you can use .then() to get to the result, and then get to your data with a loop :)
collection
.find({}, { name: true })
.toArray()
.then(function(result) {
result.forEach(function(data) {
console.log("name: %s", data.name);
});
});
Have fun :)
.then() and keep on nesting until you reach the end of what you want to do. This is called the Callback Hell (callbackhell.com). The name is not that nice, but this is the coding style of JavaScript. You can avoid this type of style, but that would require a lot of explanation. I give you lots of good keywords for uncle Google. You should be able to take it from hear :)To get the values in an array you can use the distinct() method as follows:
collection.distinct("name").then(function(categories) {
console.log("Categories Found", categories);
console.log("First Category", categories[0]);
})
or using a callback function as:
collection.distinct("name", function(err, categories) {
if (err) throw err;
console.log("Categories Found", categories);
console.log("First Category", categories[0]);
})
collection.find({},{ name: true }).toArray().then(function(data){ console.log("Categories Found", data); })distinct()method which will give you the names in an array with a single call, as in this answer.