I've got the following array:
This is an array of Users, and each User has an Attributes array.
Now I want to make a new array with users and only their attributes. Like this
users{
0: {
"phone_number",
"email"
}
}
What would be the best way to achieve this?
thanks
If you need Array of users which contains arrays with users attributes, then you can use Array.prototype.map method:
let users = [
{ Attributes: [ { Name: 'phone_number' }, { Name: 'email' } ] },
{ Attributes: [ { Name: 'phone_number1' }, { Name: 'email1' } ] }
];
let result = users.map((user) => user.Attributes.map((attr) => attr.Name));
console.log(result)
Related
Given an object searchable, is there a simple way of returning all the id values using lodash or underscore.js (or equivalent) where I can define the path to id?
const searchable = {
things: [
{
id: 'thing-id-one',
properties: [
{ id: 'd1-i1' },
{ id: 'd1-i2' },
]
},
{
id: 'thing-id-two',
properties: [
{ id: 'd2-i1' },
{ id: 'd2-i2' },
]
}
]
}
I am looking to see if this is possible in a manner similar to how we can use lodash.get e.g. if we wanted to return the things array from searchable we could do
const things = _.get(searchable, 'things');
I can't seem to find anything similar in the documentation. I am looking for something
that could contain an implementation similar to:
_.<some_function>(searchable, 'things[].properties[].id')
Note: I am well aware of functions like Array.map etc and there are numerous ways of extracting the id property - it is this specific use case that I am trying to figure out, what library could support passing a path as a string like above or does lodash/underscore support such a method.
Found a solution using the package jsonpath
const jp = require('jsonpath');
const result = jp.query(searchable, '$.things[*].properties[*].id')
console.log(result);
// outputs: [ 'd1-i1', 'd1-i2', 'd2-i1', 'd2-i2' ]
you can do it easily in plain js
like this
const searchable = {
things: [
{
id: 'thing-id-one',
properties: [
{ id: 'd1-i1' },
{ id: 'd1-i2' },
]
},
{
id: 'thing-id-two',
properties: [
{ id: 'd2-i1' },
{ id: 'd2-i2' },
]
}
]
}
const search = (data, k) => {
if(typeof data !== 'object'){
return []
}
return Object.entries(data).flatMap(([key, value]) => key === k ? [value]: search(value, k))
}
console.log(search(searchable, 'id'))
_.map and _.flatten together with iteratee shorthands let you expand nested properties. Every time you need to expand into an array, just chain another map and flatten:
const searchable = {
things: [
{
id: 'thing-id-one',
properties: [
{ id: 'd1-i1' },
{ id: 'd1-i2' },
]
},
{
id: 'thing-id-two',
properties: [
{ id: 'd2-i1' },
{ id: 'd2-i2' },
]
}
]
}
// Let's say the path is "things[].properties[].id"
const result = _.chain(searchable)
.get('things').map('properties').flatten()
.map('id').value();
console.log(result);
<script src="https://cdn.jsdelivr.net/npm/underscore#1.13.4/underscore-umd-min.js"></script>
How can i sort and rearrange an array that looks like this
fields = [
{
uid: '2c2162cc-37d0-f1e3-96c2-6d9ccb50f38d',
field: new ObjectId("627f816d8443318c6aaa1220"
},
{
uid: '2aa60f96-135b-e179-2b46-516c87a877cc',
field: new ObjectId("6283cb3ca573a56e11587c46"),
}
]
to match the arrangement of this array:
order = [ '6283cb3ca573a56e11587c46', '627f816d8443318c6aaa1220' ]
Here is the output I’m looking for:
[
{
uid: '2aa60f96-135b-e179-2b46-516c87a877cc',
field: new ObjectId("6283cb3ca573a56e11587c46"),
},
{
uid: '2c2162cc-37d0-f1e3-96c2-6d9ccb50f38d',
field: new ObjectId("627f816d8443318c6aaa1220"),
}
]
findIndex and sort but I am very confused
fields.sort((a: any, b: any) => order.indexOf(a.field) - order.indexOf(b.field)) // It does not work
You need to use sort method on the array. And then compare the index of field on the order array.
const data = [
{
uid: '2aa60f96-135b-e179-2b46-516c87a877cc',
field: "6283cb3ca573a56e11587c46",
value: 'test val 6'
},
{
uid: '2c2162cc-37d0-f1e3-96c2-6d9ccb50f38d',
field: "627f816d8443318c6aaa1220",
value: ''
}
]
const order = [ '6283cb3ca573a56e11587c46', '627f816d8443318c6aaa1220' ];
data.sort((a,b) => order.indexOf(a.field) - order.indexOf(b.field));
console.log(data);
Notice: ObjectId class is not defined here, so I changed it to string here for simplicity.
So I tried several ways, but I can't, I can modify several objects with the same key but I can't modify any with different keys, if anyone can help me is quite a complex problem
{
id: 123,
"infos": [
{ name: 'Joe', value: 'Disabled', id: 0 },
{ name: 'Adam', value: 'Enabled', id: 0 }
]
};
In my database I have a collection with an array and several objects inside which gives this.
I want to modify these objects, filter by their name and modify the value.
To give you a better example, my site returns me an object with the new data, and I want to modify the database object with the new object, without clearing the array, the name key never changes.
const object = [
{ name: 'Joe', value: 'Hey', id: 1 },
{ name: 'Adam', value: 'None', id: 1 }
];
for(const obj in object) {
Schema.findOneAndUpdate({ id: 123 }, {
$set: {
[`infos.${obj}.value`]: "Test"
}
})
}
This code works but it is not optimized, it makes several requests, I would like to do everything in one request, and also it doesn't update the id, only the value.
If anyone can help me that would be great, I've looked everywhere and can't find anything
My schema structure
new Schema({
id: { "type": String, "required": true, "unique": true },
infos: []
})
I use the $addToSet method to insert objects into the infos array
Try This :
db.collection.update({
id: 123,
},
{
$set: {
"infos.$[x].value": "Value",
"infos.$[x].name": "User"
}
},
{
arrayFilters: [
{
"x.id": {
$in: [
1
]
}
},
],
multi: true
})
The all positional $[] operator acts as a placeholder for all elements in the array field.
In $in you can use dynamic array of id.
Ex :
const ids = [1,2,..n]
db.collection.update(
//Same code as it is...
{
arrayFilters: [
{
"x.id": {
$in: ids
}
},
],
multi: true
})
MongoPlayGround Link : https://mongoplayground.net/p/Tuz831lkPqk
Maybe you look for something like this:
db.collection.update({},
{
$set: {
"infos.$[x].value": "test1",
"infos.$[x].id": 10,
"infos.$[y].value": "test2",
"infos.$[y].id": 20
}
},
{
arrayFilters: [
{
"x.name": "Adam"
},
{
"y.name": "Joe"
}
],
multi: true
})
Explained:
You define arrayFilters for all names in objects you have and update the values & id in all documents ...
playground
I am trying to filter the parent array products based on the selected value which should be contained as the child. For example in my case I was trying to get all the product objects as an array which contained the string "iphone". It is not working for me and I can't seem to locate my error. Please may someone help.
What I have tried:
const selected = 'iphone'
const products = [
{
id: "4irnflpd0",
productItem: [ "iphone", "ipad", "kindle"],
},
{
id: "glrscb1m3s9k",
productItem: ["airpods","iphone",],
},
{
id: "uumkugk3jxof",
productItem: ["macbook","cable"]
},
]
var filtered = products.map(o=>{
o = Object.assign({},o); //Clone the object. So any changes will not affect the original array.
o.productItem.map(p=>{ //Use map to loop thru the products
p = p.filter(v=>v === selected); //Filter the products which include selected
});
return o;
})
Expected array output:
const products = [
{
id: "4irnflpd0",
productItem: [ "iphone", "ipad", "kindle"],
},
{
id: "glrscb1m3s9k",
productItem: ["airpods","iphone",],
},
]
Just a simple filter() method should work for us in this case. T further simplify, we can also use object restructuring, so instead of writing product.productItem.includes(selected), we'll only need to write productItem.includes(selected).
All we have to do is filter the source array by which items include the selected value:
const selected = 'iphone';
const products = [
{ id: "4irnflpd0", productItem: ["iphone", "ipad", "kindle"] },
{ id: "glrscb1m3s9k", productItem: ["airpods", "iphone", ] },
{ id: "uumkugk3jxof", productItem: ["macbook", "cable"] },
];
const filtered = products.filter(({productItem}) => productItem.includes(selected));
console.log(filtered);
If you'd prefer not to use Object destructuring, just swap that filter line for this more traditional one:
products.filter(p => p.productItem.includes(selected))
If you're not sure that every single item in your array will have the productItem key, then you should use optional chaining to prevent an error being thrown. This is as simple as adding ? before after property name. Here it is all put together:
products.filter(p => p.productItem?.includes(selected))
First of all no need to make a copy since with map function you allocated the result to new variable without changing the new array
So you need to do this
const filtered = products.map(p=>{
return p.productItem.includes(selected)
})
You can use the filter() methods on products array and find if the selected item is available in the productItems
const selected = 'iphone'
const products = [
{ id: "4irnflpd0", productItem: [ "iphone", "ipad", "kindle"] },
{ id: "glrscb1m3s9k", productItem: ["airpods","iPhone",] },
{id: "uumkugk3jxof", productItem: ["macbook","cable"] }
]
var filtered = products.filter(product =>
product.productItem?.includes(selected));
console.log(filtered);
I'm using a nested array with the following structure:
arr[0]["id"] = "example0";
arr[0]["name"] = "name0";
arr[1]["id"] = "example1";
arr[1]["name"] = "name1";
arr[2]["id"] = "example2";
arr[2]["name"] = "name2";
now I'm trying to get a nested Json Object from this array
arr{
{
id: example0,
name: name00,
},
{
id: example1,
name: name01,
},
{
id: example2,
name: name02,
}
}
I tought it would work with JSON.stringify(arr); but it doesen't :(
I would be really happy for a solution.
Thank you!
If you are starting out with an array that looks like this, where each subarray's first element is the id and the second element is the name:
const array = [["example0", "name00"], ["example1", "name01"], ["example2", "name02"]]
You first need to map it to an array of Objects.
const arrayOfObjects = array.map((el) => ({
id: el[0],
name: el[1]
}))
Then you can call JSON.stringify(arrayOfObjects) to get the JSON.
You need to make a valid array:
arr = [
{
id: 'example0',
name: 'name00',
},
{
id: 'example1',
name: 'name01',
},
{
id: 'example2',
name: 'name02',
}
];
console.log(JSON.stringify(arr));
Note that I am assigning the array to a variable here. Also, I use [] to create an array where your original code had {}.