logo
Tags down

shadow

Read a field from every array object


By : Matt
Date : October 17 2020, 03:08 PM
I hope this helps you . I'd use Array.map() for this - it executes a function against every element of an array and makes a new array from the results. So you can do this:
code :
function toDate( item ) {
   return item.date;
}
var allDates = info.map( toDate );


Share : facebook icon twitter icon

Error while sorting array of objects Cannot assign to read only property '2' of object '[object Array]'


By : user2098940
Date : March 29 2020, 07:55 AM
hop of those help? Because the array is frozen in strict mode, you'll need to copy the array before sorting it:
code :
array = array.slice().sort((a, b) => b.stats.speed - a.stats.speed)

Array.reduce() group by object field and extend all other fields to their corresponding grouped object field


By : user2918093
Date : March 29 2020, 07:55 AM
Hope this helps You could merge each object depending on key name on each loop with reduce:
code :
let doc = [{"car": "Ford","prices": ["12", "3", "5", "1"],"model": "SUV"},{"car": "Ford","prices": ["99","88","77"],"model": "T3"},{"car": "Toyota","prices": ["33","44","55"],"model": "Subaru"},{"car": "Toyota","prices": ["66", "50", "22"],"model": "Cheyenne"},{"car": "Peugeot","prices": ["1","2","3"],"model" : "503"}];

let CarDoc = doc.reduce((a, {car, prices, model}) => {
  if(a[car]) {
    prices.forEach(p => a[car].prices.push(p))
    a[car].model = [...a[car].model, model]
  } else {
    a[car] = {prices, model:[model]}
  }
  return a
}, {})

console.log(CarDoc)
let doc = [{"car": "Ford","prices": ["12", "3", "5", "1"],"model": "SUV"},{"car": "Ford","prices": ["99","88","77"],"model": "T3"},{"car": "Toyota","prices": ["33","44","55"],"model": "Subaru"},{"car": "Toyota","prices": ["66", "50", "22"],"model": "Cheyenne"},{"car": "Peugeot","prices": ["1","2","3"],"model" : "503"}];

let CarDoc = doc.reduce((a, {car, prices, model}) => a[car] ? {...a, [car]: {prices: a[car].prices.concat(prices), model: a[car].model.concat(model)}} : {...a, [car]: {prices, model:[model]}}, {})

console.log(CarDoc)
let doc = [{"car": "Ford", test: 'test', "prices": ["12", "3", "5", "1"],"model": "SUV"},{"car": "Ford", test: 'test', "prices": ["99","88","77"],"model": "T3"},{"car": "Toyota","prices": ["33","44","55"],"model": "Subaru"},{"car": "Toyota","prices": ["66", "50", "22"],"model": "Cheyenne"},{"car": "Peugeot","prices": ["1","2","3"],"model" : "503"}];

let CarDoc = doc.reduce((a, {car, ...rest}) => {
  Object.entries(rest).forEach(([k,v]) => {
    if(a[car]) {
      a[car][k] = [...a[car][k] || [], v]
    } else {
      a[car] = {...a[car], [k]: [v]}
    }
  })
  
  return a
}, {})

console.log(CarDoc)

Firestore delete a field in an object is a field of another object inside an array


By : Mohammad Ali Bani Yo
Date : March 29 2020, 07:55 AM
I hope this helps you . What I said earlier is untrue. It is not possible to update an individual element in an array in a Firestore document. See How to Add/Update/Remove array elements in firebase firestore android using Hashmap? A Store Database
Since actions is an array, you'll need to specify the array index of the element you want to update. So:update["actions.0.value.abc"] = ...

MongoDB - Update field in an array object based on nested array's field value


By : user3611529
Date : March 29 2020, 07:55 AM
I hope this helps . I am trying to update a field inside array of objects, where field in nested array is equal to a value. , Please try this :
code :
db.Product.findOneAndUpdate(
        { _id: 123 },
        {
            $set: {
                'variations.$[item].valueList.$[nameField].value': 'newRed',
                'variations.$[item].picture': 'newURL' // item is each object in variations which is being checked in arrayFilters.
            }
        },
        {
            arrayFilters: [{ 'item.valueList.value': 'oldRed' }, { 'nameField.value': 'oldRed' }],
            new: true
        }
   )
{
    "_id" : 123,
    "variations" : [ 
        {
            "id" : 1,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }, 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }
            ]
        }, 
        {
            "id" : 2,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "black"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }, 
        {
            "id" : 3,
            "picture" : "https://example3.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "oldRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }
    ]
}
/* 1 */
{
    "_id" : 123,
    "variations" : [ 
        {
            "id" : 1,
            "picture" : "newURL",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "newRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }, 
                {
                    "name" : "color",
                    "value" : "newRed"
                }
            ]
        }, 
        {
            "id" : 2,
            "picture" : "https://example.picture.com",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "black"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }, 
        {
            "id" : 3,
            "picture" : "newURL",
            "valueList" : [ 
                {
                    "name" : "color",
                    "value" : "newRed"
                }, 
                {
                    "name" : "size",
                    "value" : "M"
                }
            ]
        }
    ]
}

mongodb, Updating a field in an object in array field equal to a document field


By : ralfingo
Date : March 29 2020, 07:55 AM
Hope this helps let's say I have docs such as , Try this (v4.2):
code :
db.users.updateMany(
    {"comments.nickname":null},
    [
        {"$set": {"comments.nickname": "$nickname"}}
    ]
)
db.users.aggregate([
  {
    $match: {
      "comments.nickname": null
    }
  },
  {
    $addFields: {
      comments: {
        $map: {
          input: "$comments",
          in: {
            id: "$$this.id",
            nickname: {
              $cond: [
                "$$this.nickname",
                "$$this.nickname",
                "$nickname"
              ]
            }
          }
        }
      }
    }
  },
  {
    $out: "users"
  }
])
Related Posts Related Posts :
  • Container's height doesn't be exact as on my screen
  • How to do pagination in Google Firestore?
  • Momentjs strict format always returns 'Invalid date'
  • Is there a api or way to hook into SSRS with a MVC application
  • Can't achieve to beat a ball in my JS Pong Game
  • How do I use composition with es6 classes in the same way as this example does using factory functions?
  • Fetch local JSON file from public folder ReactJS
  • Validate form fields with javascript
  • Jquery detect click OR keystroke?
  • How to change inner div's when cloning a template?
  • Compare two objects and extract the ones that have same Key in javascript
  • Nodejs, Request and Dot notation
  • Array key does not get interpolated when making object
  • Three.js ply not showing
  • Php Ajax Form is not submitting
  • Global Variable and how pass the value in IONIC3
  • Office.js displayDialogAsync throws internal error
  • Is there a shorter way to write Ember computed/get method?
  • How can I display/hide a component depending on a property on the Redux store?
  • Range Selector - Changing bar color only when active
  • Creating a new array of objects by finding values in JSON data
  • How to avoid providing a dummy Vue data structure during initialization?
  • Digital time to readable duration using javascript
  • JavaScript update outside function variable from inner function
  • Update a document with mongoose (update property of document property)
  • Highcharts' bullet graph's serie's doesn't extend all the way
  • 2 way-binding with a nested property inside object. (VueJS + VueX)
  • Angular uiCalendar not redenring events
  • Use blade inside a JavaScript variable
  • Group objects by multiple properties in array then sum up their values
  • Electron: Maximized browserWindow overlaps Window' taskbar
  • Mongoose deep populate results in [Object] at 2nd level
  • Redux: cloning state does not work
  • angularjs detect changes in input when value is modified by JQuery
  • How to release a file after accessing it with JavaScript (adobe)
  • Handle/catch errors without repeating code?
  • Filter search Results
  • How to efficiently add items to collection with firebase firestore
  • Change Bootstrap Popover trigger on Click
  • Pushing new objects replaces previous object
  • Function with dynamic return in typescript
  • How Do I bind javascript type of File to a Nancy Model containing HttpFile?
  • Simplifying jquery / javascript for checkbox links
  • Javascript ES6 Classes composition
  • Chart.js max legend height
  • Change color of a styled checked checkbox with button
  • How to set weight and height in Css with responsive when reduce screen size
  • Price formatting and user input value to change slider
  • Pass params to q.defer (d3.csv)
  • Combine a textfield and TinyMCE field to a third field with JavaScript. Constrain TinyMCE to Numbered List
  • Javascript regex to match alpha length followed by number length
  • Pass props from child to parent react navigation
  • How to share redux store in multiple components
  • Javascript Regex Expression Not Returning Expected Value
  • with draft.js is it possible to create a custom block span with classname
  • How to convert Javascript object to a url string?
  • Adobe Javascript in Action Wizard vs a form button
  • Filtering Tooltip in Kendo
  • How to update a grouped bar-chart in d3js
  • Javascript ES6 custom sort method not working all the times
  • shadow
    Privacy Policy - Terms - Contact Us © soohba.com