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In WPF: Children.Remove or Children.Clear doesn't free objects


In WPF: Children.Remove or Children.Clear doesn't free objects

By : Victor Stoe
Date : January 02 2021, 06:48 AM
With these it helps Update: I tried this on another, more cleanly installed, machine. I could not reproduce this on that machine. If I find out what offending (VSStudio) component causes this, I will let you know. , Change
public class MyControl : UserControl
code :


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Can't iterate over children's children because of the subsequent .clear()?

Can't iterate over children's children because of the subsequent .clear()?


By : karan
Date : March 29 2020, 07:55 AM
should help you out
The problem is that iterparse by default yields end events. For subelements end events are generated earlier than for their ancestors:
code :
>>> for ev, elem in etree.iterparse(xml):
       print elem

<Element b at 0x38fe320>
<Element d at 0x38fe0f0>
<Element c at 0x38fe2d0>
<Element a at 0x38fe190>
<Element z at 0x38fe230>
<Element a at 0x38fe3c0>
<Element root at 0x2df48c0>
for ev, elem in etree.iterparse(xml, events=('start',)):
    ...
found = False
for event, elem in etree.iterparse(source, events=('start', 'end')):
    if event == 'start':
        if elem.attrib.get('id') == elem_id:
            found = True
    else:
        if elem.attrib.get('id') == elem_id:
            return _get_info(elem)
        if not found:
            elem.clear()
JSON.parse returns children objects with null value, children values not being parsed

JSON.parse returns children objects with null value, children values not being parsed


By : hathania
Date : March 29 2020, 07:55 AM
hop of those help? I have a JavaScript object that I am stringifying with JSON.stringify that returns a JSON string with parent and children data. , So I eventually solved my problem and this is how I did it.
code :
function cacheForm(agency) {
    // GET my object from agency vm
    var agency = ko.toJS(agency);

    var s = YUI().use("json-stringify", function (Y) {    
        var jsonStrAgency = Y.JSON.stringify(agency, ["activities", "agencyName", "agencyID", "campaignBillings", "category", "declaredBillings", "immediateParent", "numberOfEmployees", "ultimateParent", "uRL"]); // Use an array of acceptable object key names as a whitelist.
        var jsonStrOffices, jsonStrContacts;

        for (i in agency.offices) {
            jsonStrOffices = Y.JSON.stringify(agency.offices, ["address1", "address2", "address3", "address4", "address5", "agencyID", "faxNumber", "officeID", "postCode", "telephoneNumber"]);

        for (ii in agency.offices[i].contacts) {
                    jsonStrContacts = Y.JSON.stringify(agency.offices[i].contacts, ["agencyID", "emailAddress", "firstName", "jobName", "officeID", "personID", "surName", "title"]);
            }
        }

        localStorage.setItem('Agency', jsonStrAgency);
        localStorage.setItem('Offices', jsonStrOffices);
        localStorage.setItem('Contacts', jsonStrContacts);
    });
}
 var s = YUI().use("json-stringify", function (Y) {  
<script src="http://yui.yahooapis.com/3.11.0/build/yui/yui-min.js"></script>
define(['services/datacontext'], function (dataContext) {
    var initialized = false;
    var agency;

    if (localStorage.Agency && localStorage.Offices && localStorage.Contacts) {
        var objAgency = new Object(ko.mapping.fromJSON(localStorage.getItem('Agency')));
        var objOffices = new Object(ko.mapping.fromJSON(localStorage.getItem('Offices')));
        var objContacts = new Object(ko.mapping.fromJSON(localStorage.getItem('Contacts')));

        objAgency.offices = objOffices;
        objAgency.offices._latestValue[0].contacts = objContacts;


        agency = ko.observableArray([ko.mapping.fromJS(objAgency)]);
        ko.applyBindings(agency);

        initialized = true;

    }
    else {
        agency = ko.observableArray([]);
    }
define(['services/datacontext'], function (dataContext) {
    var initialized = false;
    var agency;

    if (localStorage.Agency && localStorage.Offices && localStorage.Contacts) {
        var objAgency = new Object(ko.mapping.fromJSON(localStorage.getItem('Agency')));
        var objOffices = new Object(ko.mapping.fromJSON(localStorage.getItem('Offices')));
        var objContacts = new Object(ko.mapping.fromJSON(localStorage.getItem('Contacts')));

        objAgency.offices = objOffices;
        objAgency.offices._latestValue[0].contacts = objContacts;


        agency = ko.observableArray([ko.mapping.fromJS(objAgency)]);
        ko.applyBindings(agency);

        initialized = true;

    }
    else {
        agency = ko.observableArray([]);
    }


    var save = function (agency, myStoredValue) {
        // Clear Cache because user submitted the form. We don't have to hold onto data anymore.
        //amplify.store("Agency", null);
        return dataContext.saveChanges(agency);
    };

    var vm = { // This is my view model, my functions are bound to it. 
        //These are wired up to my agency view
        activate: activate,
        agency: agency,
        title: 'agency',
        refresh: refresh, // call refresh function which calls get Agencies
        save: save,
        cacheForm: cacheForm
    };
    return vm;

    function activate() {

        vm.agency;

        if (initialized) {
            return;
        }

        initialized = false;

        return refresh();

    }

    function refresh() {
        return dataContext.getAgency(agency);
    }


    function cacheForm(agency) {
        // GET my object from agency vm
        var agency = ko.toJS(agency);

        var s = YUI().use("json-stringify", function (Y) {

            var jsonStrAgency = Y.JSON.stringify(agency, ["activities", "agencyName", "agencyID", "campaignBillings", "category", "declaredBillings", "immediateParent", "numberOfEmployees", "ultimateParent", "uRL"]); // Use an array of acceptable object key names as a whitelist.
            var jsonStrOffices, jsonStrContacts;

            for (i in agency.offices) {
                jsonStrOffices = Y.JSON.stringify(agency.offices, ["address1", "address2", "address3", "address4", "address5", "agencyID", "faxNumber", "officeID", "postCode", "telephoneNumber"]);

                for (ii in agency.offices[i].contacts) {
                    jsonStrContacts = Y.JSON.stringify(agency.offices[i].contacts, ["agencyID", "emailAddress", "firstName", "jobName", "officeID", "personID", "surName", "title"]);
                }
            }

            localStorage.setItem('Agency', jsonStrAgency);
            localStorage.setItem('Offices', jsonStrOffices);
            localStorage.setItem('Contacts', jsonStrContacts);
        });
    }
});
Safely clear (or remove children) of a DivElement

Safely clear (or remove children) of a DivElement


By : Sanj
Date : March 29 2020, 07:55 AM
Any of those help Think about what happens in this loop. Lets take a div with three children:
int count = rows.getChildCount();
code :
Node child = rows.getChild(0);
rows.removeChild(child);
Node child = rows.getChild(1);
rows.removeChild(child);
Node child = rows.getChild(2); // Exception!
 while (rows.hasChildNode()) {
   rows.removeChild(rows.getFirstChild());
 }
for (int i = count; i >= 0; i--) {
  rows.removeChild(rows.getChild(i));
}
rows.setInnerHTML("");
rows.removeAllChildren();
Rails & Active Record: Find objects whose children don't belong to current_user OR who don't have any children

Rails & Active Record: Find objects whose children don't belong to current_user OR who don't have any children


By : Sagar Vipul
Date : March 29 2020, 07:55 AM
Does that help User.rb , Hacky but fun answer
code :
class Event
  has_many :votes
  has_many :user_votes,
             ->() { where({user_id: Thread.current[:user]&.id}.compact) },
             class_name: 'Vote'

  def self.using_user(user)
    old_user, Thread.current[:user] = Thread.current[:user], user
    yeild
  ensure
    Thread.current[:user] = old_user
  end
end

Event.using_user(current_user) do
  Event.includes(:user_votes).where("votes.id IS NULL")
end
Event.
  joins(
   "LEFT OUTER JOIN votes ON votes.event_id = events.id AND " +
   "votes.user_id = #{user.id}"
  ).
  where("votes.id IS NULL")
How to filter through children of array of objects and then return parent with updated children?

How to filter through children of array of objects and then return parent with updated children?


By : user3316519
Date : March 29 2020, 07:55 AM
wish helps you You can use map() and filter() to do that.
code :
let arr = [ { "id": 1, "name": "group1", "users": [ { "id": 1, "name": "Mike" }, { "id": 2, "name": "Steve" }, { "id": 3, "name": "John" } ] }, { "id": 2, "name": "group2", "users": [ { "id": 4, "name": "Phill" }, { "id": 5, "name": "Joe" }, { "id": 6, "name": "Dominik" } ] } ];

function filterUsers(arr, name) {
  return arr.map(obj => {
    return {
      ...obj,
      "users": obj.users.filter(user => user.name === name)
    };
  });
}

console.log(filterUsers(arr, "Mike"));
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