I have a json object that shows parent children relationships.
I find it very difficult to query for a certain child.
For example here's the data.
var parents = [
{
name: 'Susan',
children: [{
name: 'Joe'
}, {
name: 'Sam'
}, {
name: 'Michael'
}]
},
{
name: 'Ted',
children: [{
name: 'Richard'
}, {
name: 'Brad'
}]
}
]
In an elegant way I'd like to be able to find the object based on parent name and child name.
Parent: Susan
Child: Joe
Here's how I'd do the 3 types of queries I'm trying to do in C#
var parentQuery = parents.filter(parent=> parent.name == 'Susan');
var childQuery = parents.filter(parent=> parent.children.name == 'Joe');
var parentChildQuery = parents.filter(parent=> parent.name == 'Susan' && parent.children.name == 'Joe')
The parentQuery works out of the box in Javascript to my delight. But the childQuery search doesn't work. Since parent has an internal array I'm not sure how to reference to query on a property. Shown below.
parent.children.name == 'Joe'
Any help would be greatly appreciated!
.children is an array and doesn't have a .name property. Maybe you meant one of
parents.filter(parent => parent.children[0].name == 'Joe');
parents.filter(parent => parent.children.every(child => child.name == 'Joe'));
parents.filter(parent => parent.children.some(child => child.name == 'Joe'));
Related
I'm writing a back code using NodeJs to fetch some data from backend, I want dataBase data to be like this
like this:
data = [{
name: "Admin",
id: '1',
children: [
{ name: "Admin", id: "1" },
{ name: "groupe1", id: "2" },
{
name: "groupe2", id: "1455", children: [
{ name: "groupe2", id: "1455" },
{ name: "gro", id: "5444" },
{ name: "hhrr", id: "45" }
]
}
]
}]
the idea is simple we have a list of group each group has a parent I want to display all the groups list in an hierarchical way the top one of the tree is done
Some groups are parents and groups in the same time and some others are only groups if the group is not parent we add an object with its name and ID in the array of children of his parent
if this groups is a parent that's mean it has children we add an object with its ID and name in the array of children of his parents, and we add property children for the object which is array named children with for the first time an object with the name and the id of the group etc...
i tryed to do this but it did not work
const getParentsByType = async ({ name, _id }) => {
let parentResult = [
{
id: _id,
name: name,
children: [
{
id: _id,
name: name,
},
],
},
];
parentResult= await findParent(_id, parentResult[0].children, 0);
return parentResult;
};
const findParent = async (parentId, parentResult, itemPos) => {
let children = await Models.GroupModel.find({ parent: parentId, status: true }).select('name _id');
for (let i = 0; i < children.length; i++) {
let childrenList = await Models.GroupModel.find({ parent: children[i]._id, status: true }).select('name _id');
if (childrenList.length != 0) {
parentResult.push(buildParentWithChild(children[i]._id, children[i].name));
findParent(children[i]._id,parentResult.children[i],itemPos++)
} else {
parentResult.push(buildParent(children[i]._id, children[i].name));
}
}
return parentResult
};
and this the model of the data base
const Group = mongoose.Schema({
name: {
type: String,
required: true,
},
status: {
type: Boolean,
required: true,
},
parent: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Group',
},
});
i had two days trying to resolve tis but with no result
i need some helps and Thank you
Try parsing your returned data. It validates your data as objects i dont see any problem with your function regardless i still have no idea what format your a trying to build.
let children = JSON.parse(JSON.stringify(await Models.GroupModel.find({ parent: parentId, status: true }).select('name _id')));
let childrenList = JSON.parse(JSON.stringify(await Models.GroupModel.find({ parent: children[i]._id, status: true }).select('name _id')));
If I understand you right, you want to convert the array returned by Models.GroupModel.find, and which looks like
var dbresult = [
{_id: "1", parent: null, name: "one"},
{_id: "2", parent: "1", name: "two"}
];
into a hierarchical structure. This can be done with a function that adds all children of a given parent p, including, recursively, their children. Like the following:
function children(p) {
var result = [];
for (r of dbresult) if (r.parent === p) {
var row = {_id: r._id, name: r.name};
var chld = children(r._id);
if (chld.length > 0) row.children = chld;
result.push(row);
}
return result;
}
console.log(JSON.stringify(children(null)));
Note that this approach requires only one database access (to fill the dbresult) and is therefore probably faster than your findParent function.
Given an XML document such as this:
<Root>
<Child1>
<ChildOfChild1_1>
<FinalChild> </FinalChild>
</ChildOfChild1_1>
<ChildOfChild1_2> </ChildOfChild1_2>
</Child1>
<Child2>
<ChildOfChild2_1> </ChildOfChild2_1>
</Child2>
<Child3> </Child3>
</Root>
I would like to return a object which has only two parameters, name and children. It would look like:
{
name: "Root"
children: [
{
name: "Child1"
children: [
{
name: "ChildOfChild1_1"
children:[
{
name: "FinalChild"
children: null
}
]
},
{
name: "ChildOfChild1_2"
children: null
}
]
},
{
name: "Child2"
children: [
{
name: "ChildOfChild2_1"
children: null
}
]
},
{
name: "Child3"
children: null
},
]
}
I do not care about node attributes, only nodeName and if they have children. I wrote code to get the first level of children but cannot wrap my head around the recursive part to get as deep as necessary. Thanks.
Below is what I have so far:
//assuming block is the root node and the root will at least have 1 child
let root = {
name = '',
children = []
};
root.name = block.nodeName;
for(let i=0 ; i<block.children.length ; i++) {
root.children.push(getChildren(block.children[i]));
}
function getChildren(data) {
let child = {};
child.name = data.nodeName;
child.children = []; //stuck here
return child;
}
The task is much simpler than you think.
You want a function that returns a node name and the list of node children, each of them processed in the exact same way:
function toObject(node) {
return {
name: node.nodeName,
children: [...node.children].map(toObject)
};
}
That's it.
const xmlDoc = new DOMParser().parseFromString(`<Root>
<Child1>
<ChildOfChild1_1>
<FinalChild> </FinalChild>
</ChildOfChild1_1>
<ChildOfChild1_2> </ChildOfChild1_2>
</Child1>
<Child2>
<ChildOfChild2_1> </ChildOfChild2_1>
</Child2>
<Child3> </Child3>
</Root>
`, "application/xml");
function toObject(node) {
return {
name: node.nodeName,
children: [...node.children].map(toObject)
};
}
const tree = toObject(xmlDoc.documentElement);
console.log(tree);
If you really want null when there are no children (an empty array is much easier to handle down the line, trust me), I'm sure you can make the necessary change in toObject yourself.
I have a parent component with a data object config as below:
data() {
return {
config: {
Groups: [
{
name: "A",
Types: [
{ mask: 1234, name: "Alice", type: 1},
{ mask: 5678, name "Bob", type: 1},
]
},
{
name: "B",
Types: [
{ mask: 9876, name: "Charlie", type: 2},
{ mask: 5432, name "Drake", type: 2},
]
}
],
},
Defaults: {
dummyBoolean: false,
dummyNumber: 1
}
}
}
}
There are also 2 child components that for each of them, I want to pass the Types array (within each elements of the Groups object) if each_element.name == child component's name.
What I've done so far is having a computed function for each of the components as follows (which is highly inefficient):
computed: {
dataSender_A() {
let array= []
this.config.Groups.forEach( element => {
if (element.name === "A") array = element.Types
});
return array
},
dataSender_B() {
let array= []
this.config.Groups.forEach( element => {
if (element.name === "B") array = element.Types
});
return array
},
}
I'm looking for a better alternative to make this happen (as I might have more child components) and two approaches I tried so far have failed.
Having only one computed function that takes the component's name as argument and can be passed like <child-component-A :types="dataSender('A')" /> <child-component-B :types="dataSender('B')" /> (As it throws error dataSender is not a function)
computed: {
dataSender: function(groupName) {
let array= []
this.config.Groups.forEach( element => {
if (element.name === groupName) array = element.Types
});
return array
},
}
Having the above function in methods and pass that as props to child components (As it passes the function itself, not the outputted array)
I'd appreciate any help on this.
The computed properties don't accept parameters that are involved in the calculation, In this case you could just use a method like :
methods: {
dataSender: function(groupName) {
let array= []
this.config.Groups.forEach( element => {
if (element.name === groupName) array = element.Types
});
return array
},
}
customerProducts: [
{
name: "foo",
id: 123
},
{
name: "test",
id: 44
}
]
otherProducts: [
{
name: "other",
id: 44
},
{
name: "test",
id: 21
}
]
I want to iterate through customerProducts, which is an array of objects. I want to filter the customerProducts that have an ID that another array of objects, otherProducts, has. So for examople, I'd want the returned result in this case to be:
{
name: "test",
id: 44
}
since otherProducts has an id of 44.
I was thinking of mapping through otherProducts and just returning an array of IDs, then running a forEach on that but that seems like a long way of doing it.
Create an indexed Set of the values to filter by (id from otherProducts) then filter customerProducts by that Set
const customerProducts = [{name: "foo",id: 123},{name: "test",id: 44}]
const otherProducts = [{name: "other",id: 44},{name: "test",id: 21}]
const otherProductIds = new Set(otherProducts.map(({ id }) => id))
const filteredCustomerProducts = customerProducts.filter(({ id }) =>
otherProductIds.has(id))
console.info(filteredCustomerProducts)
This can be done by using array methods filter and some.
customerProducts.filter((x)=> otherProducts.some(y=> y.id === x.id));
Explanation:
filter method will call each and every element in the otherProducts array and check if the id of customerProduct is present in otherProducts for at least one element.
declare customerProducts , otherProducts as JS array variable and use JS Array filter find functions
let customerProducts = [
{
name: "foo",
id: 123
},
{
name: "test",
id: 44
}
]
let otherProducts = [
{
name: "other",
id: 44
},
{
name: "test",
id: 21
}
];
let filtered = customerProducts.filter( el => otherProducts.find( e => e.id == el.id) )
console.log(filtered);
I am trying to write a function to take the first object in the "parent" array, pull out the child field (which is in that array) and use that field to filter the second object called "child".
I want to get all the related records from the child object that are in the child field in the parent object.
Expected output
child: [
{
**id: 1,**
name: 'Jimmy Yukka',
},
{
**id: 2,**
name: 'Up North',
}
INPUT
Parent: [
{
**id: 1,**
name: 'Melbourne Bands',
**child: [1, 2]**
}
I have the following data
Parent: [
{
**id: 1,**
name: 'Melbourne Bands',
**child: [1, 2]**
},
{
id: 2,
name: 'Sydney Bands',
child: [3]
}
],
child: [
{
**id: 1,**
name: 'Jimmy Yukka',
},
{
**id: 2,**
name: 'Up North',
},
{
id: 3,
url: 'jimmyyukka.com',
name: 'INXS',
CreatedByUserId: 1
}
],
The code of the function I have implemented so far:
currentChildrenIds(ParentId, parentData, childData) {
const singleParentRecord = parentData.filter(function(parent) {
return parent.id === ParentId;
});
const parentsChildIds = singleParentRecord[0].books;
const childRecords = childData.filter(function(child) {
return child.id === parentsChildIds
});
return childRecords
}
NOTES
This bit here is where it is wrong
const childRecords = childData.filter(function(child) {
return child.id === parentsChildIds
This bit here is also a bit rubbish (hardcoding the [0])but not I'm not sure how I should be coding it correctly
const parentsChildIds = singleParentRecord[0].books;
here,
const childRecords = childData.filter(function(child) {
return child.id === parentsChildIds
parentsChildIds is a reference to an array: you don't want to test if an id is === to a a reference,
You have to be explicit and check if the id is contained in the array:
const childRecords = childData.filter(function(child) {
return parentsChildIds.includes(child.id)
Regarding the singleParentRecord[0] that does feel weird,
since you know the method filter will always return an array of size 1 or 0,
you can use the method find instead of filter
Also in functionnal programming (array functions such as filter, map, find...)
I advice you to read a bit about the arrow function syntax because:
The syntex is more dense and it makes it easier for your brain to understand when several functions are chained
If you want to use variables which are defined outside of the function it will be available only inside of an arrow function
your code with an arrow function:
const childRecords = childData.filter((child) => {
return child.id === parentsChildIds
}
Try this:
const Parent = [
{
id: 1,
name: 'Melbourne Bands',
child: [1, 2]
},
{
id: 2,
name: 'Sydney Bands',
child: [3]
}
];
const children = [
{
id: 1,
name: 'Jimmy Yukka',
},
{
id: 2,
name: 'Up North',
},
{
id: 3,
url: 'jimmyyukka.com',
name: 'INXS',
CreatedByUserId: 1
}
];
// We create a new array with Array.map
const result = Parent.map(parent => ({
// Spread properties of the parent
...parent,
// Override the child property and filter the children array with the `includes` method
child: children.filter(child => parent.child.includes(child.id)),
}))
console.log(result);