Views filter on Boolean with NULL value (not set)

The client wants to hide some published content in certain views.

Unpublishing content is not an option. it has to remain accessible.

I added a Boolean value exclude_from_view Field on multiple content types.

I intended to add a Boolean filter to exclude content from the required ads if the value of this field was TRUEbut I was surprised that Views did not give any results at all. Setting the Boolean filter No NOT FALSE had the same result.

This happens because the field has no default value added to the existing content, so the field is returned NULLThat is not one TRUE Yet FALSE, (In PHP NULL is a "wrong" value, but apparently not for views.)

A small investigation shows that many other people have complained about this problem.

Some of them believe that boolean fields that are not set for entities should be considered FALSENot NULL,

Others want that NULL Fields could be treated as TRUE,

Still others believe that the user interface of Views should provide filtering options for Treat NULL as FALSE"or" Treat NULL as TRUE, "(This is a cool idea, but it requires a patch core that I'm not necessarily against, if that's the best way.)

What should I do?

XenForo 2.1.5a – Full Null from NulledTeam

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XenForo 2.1.5a – Full Null from NulledTeam

Query Performance – NULL queries hang and consume connections

To run show processlist in phpmyadmin, queries with an info of zero and a time of seemingly a few seconds are often displayed to me, but they actually stuck there for a long time (every time I run) show processlist The same ID can have a different time. I have no idea what these queries are or why they get stuck, but they can often cause all of my available connections to be depleted and get stuck while waiting in Apache state and websites will not load. Is there a setting I can change to stop queries that hang for a long time? Is the php.ini setting max_execution_time responsible for this (I had it set from the default 90 to 3000)?

I have attached a screenshot of the running show processlist,

Enter image description here

mysql – Attempts to load data with a foreign status key into a table and does not accept null

I have a name and an address CSZ table with a foreign key from the field state in the state table. I use mysql v8 and use the import wizard for mysql workbenches to do the import. When I load a record with a valid status, it works fine. If I leave the status blank, the following error message appears: "The line import failed with the following error: (" Incorrect integer value: & # 39; for column & # 39; StateId & # 39; in line 1 ", 1366) ". I have an integer stateID and the field is also an integer and I load the integer value for that state. My question is why it does not accept a null value?

core – ViewComponent returns, but the model is null when using the route value in the view

Still new for razor pages and view components, but was close to a few times

I'm not sure why the model of my view component is not filled out.
One thing I've found to be wrong is to put a route parameter to the top

@page "{handler?}"

I know (at least now) that ViewComponents are not meant to be routed directly as endpoints, but now I'm curious what using a @page with a route attribute does to prevent model binding from happening. I just found out by experimenting that removing this command inserts my model in ViewComponent.

Here is the code

View Component

public class TestViewComponent : ViewComponent

    public async Task InvokeAsync(Data.CustomerListModel cust)
        List clist = new List();
        clist.Add(new Data.CustomerListModel() { Customer = "fred" });
        clist.Add(new Data.CustomerListModel() { Customer = "wilma" });

        var dlist = clist.AsEnumerable();

        return View(dlist);

View for ViewComponent, default.html

@page "{handler?}"
@using System.Collections.Generic
@addTagHelper *, TelerikAspnetCoreApp1
@model IEnumerable


Machine name @Environment.MachineName

    @foreach (Data.CustomerListModel c in Model) {
  • @c.Customer
  • }

Customer ListModel

namespace TelerikAspNetCoreApp1.Data
    public class CustomerListModel
        public string Customer { get; set; }

Parent view, Index.cshtml

@await Component.InvokeAsync("Test",new { Name = "tester123" })

physics – KinematicBody returns null to try to collide the Rigidbody

The player is a kinematic body and the enemy is a rigid body. I use move_and_slide () to move the player. When they collide, they both push in the opposite direction, making it look like physical things are working. However, when I try to get a collided object, it always returns null.

If you use move_and_collide (), null is returned, and if you try, it returns null as well:

for index in get_slide_count():
    var collision = get_slide_collision(index)

However, when I changed the enemy type to StaticBody, I now have an enemy. But I do not want to use StaticBody for enemies, they had to move! Why does collide always zero, even if it collides with Rigidbody?

linear algebra – What is the need for the left null space?

I understand the intuitive meaning and practical need for column space, row space, and null space.

But I can not really understand that the left null space is needed.

I know that the left null space is orthogonal to the row space and that it complements the full picture of 4 basic subspaces.

But what is the practical need / intuition for left null space when we know that every vector that is not in line space has no solutions?

Visual Studio – Python Vs. Source string can not contain null bytes

The source code is:

import numpy
import cv2

while true :
    if cv2.waitKey(1)&0xFF==ord('q'):

The error is: The source string can not contain null bytes.
Reference to import cv2.
What is the solution?

Raycasting – The RayCast node always returns null

I am using the RayCast node to verify that the object is grounded. Here is the setting:

Enter image description here

The RayCast knot is near the ground and is so long that it collides with the ground. The RayCast node is also activated.

The RayCast node is a child node of the FPSController node, and here is the code of the FPSController that processes the grounded logic:

onready var ground_check_raycast: RayCast = $GroundCheckRayCast

func _physics_process(delta):

func process_grounded(delta):
    var hit_collider = ground_check_raycast.get_collider()

When I start the game, first return to the ground a few times and then immediately return wrong and never return to the ground.

** Debug Process Started **
OpenGL ES 3.0 Renderer: GeForce GTX 1070/PCIe/SSE2

I have no idea why that does not work. Is there something I missed?

P.S. The ground object has a static body and a collision shape.
P.P.S. Using Godot 3.1.1