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Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

General Q&A about programming, scripting, software design & architecture, process, tools, testing, and more.

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How to tackle database migrations failure during application initialization on production systems?

Context My ASP.NET Core application got stuck in Production with a 5xx error. By inspecting the logs, I have noticed that a database error occurred during application initialization, namely a SQL ...

1 answer  ·  posted 3y ago by Alexei‭  ·  last activity 3y ago by misha130‭

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How to retain a service's data between components in Angular 8 ?

I would like to maintain a log that is available to several modules in my Angular 8 system. So I created the following service: @Injectable({ providedIn: 'root' }) export class LogService { ...

1 answer  ·  posted 3y ago by nelson777‭  ·  last activity 3y ago by nelson777‭

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Union of queries depending on variable in list

I have a big Cypher query that is depending on a variable. Example: With REGION = 'Canada' query I want to execute this query several times based on different values on a list and return the UN...

1 answer  ·  posted 3y ago by Guilherme Costa‭  ·  edited 3y ago by Alexei‭

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What are the factors to consider when deciding to split ORM queries or use eager loading?

I have extensive working experience with Entity Framework ORM and have noticed two major ways of writing LINQ (LINQ2SQL): lot of eager loading: the most prevalent, uses (lots) of Includes to eag...

0 answers  ·  posted 3y ago by Alexei‭

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How to manage views and stored procedures in an ASP.NET Core project?

I am slowly modernizing an older ASP.NET Core Web API and one of the steps involved migrating from database first to code first. Now, all schema changes and seeding is covered by migrations which ...

0 answers  ·  posted 3y ago by Alexei‭

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Why would an unique index get moved to the primary key after the underlying column is dropped?

So I had a table with a primary key and a bunch of different columns. Columns A, B, and C were all unsigned ints (like the primary key column) and each column had a unique constraint I dropped the...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  edited 3y ago by Alexei‭

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How to make Microsoft.Build.Evaluation.Project use same base properties as Visual Studio?

Microsoft.Build.Evaluation.Project seems to have some rather odd ideas of what values to use when loading projects. In particular, I have a number of projects with the following dependency: <Pa...

1 answer  ·  posted 3y ago by Peter Taylor‭  ·  last activity 3y ago by Peter Taylor‭

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Iterating through a MySQL table with a LIMIT clause and PHP gets progressively slower

I have a very large table that I need to iterate through with a PHP script and I can't do all of the results at once so I do it in sections with a LIMIT like for ($x = 0; $x < 10000000; $x += 1...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by ArtOfCode‭

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In MySQL is there a limit to the number of keys in a IN() clause?

I have a PHP program that does a SELECT and then updates some of the values based on an algorithm. Rather than updating one row at a time UPDATE example_table SET COLUMN_A = 1 WHERE primary_k...

2 answers  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by Alexei‭

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In PHP what is the use case for include instead of require when including PHP scripts?

In PHP one can either use include or require to include files, the difference is that if the file doesn't exist it will emit a fatal error and halt with a require and only emit a warning with inclu...

1 answer  ·  posted 3y ago by Charlie Brumbaugh‭  ·  last activity 3y ago by Marijn‭

php
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Privilege escalation from Python like from systemd

When you try to do a privileged systemd operation without the privilege, you get an escalation prompt: $ systemctl stop docker ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ==== ...

1 answer  ·  posted 1mo ago by matthewsnyder‭  ·  last activity 1mo ago by Karl Knechtel‭

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How to sort the output of meta / slash commands in `psql`?

For example, how to sort the output below by the values in "Column" in the psql shell itself? my_db=> \d auth_user Table "public.auth_user" Column ...

1 answer  ·  posted 6d ago by toraritte‭  ·  edited 15h ago by MER‭

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Do you need to use std::move to store a parameter passed by value?

If you have a class which needs to store a construction parameter internally, and you want to take advantage of move semantics, I understand that the parameter should be passed by value: class Foo...

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Dirk Herrmann‭

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How to inject environment configuration values when deploying an Angular application in Kubernetes or similar infrastructure?

Context I am currently migrating a Web application from on-prem infrastructure to K8s. The legacy infrastructure relies on defining some tokens in the configuration files and these are replaced d...

2 answers  ·  posted 1y ago by Alexei‭  ·  last activity 1y ago by Derek Elkins‭

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How do you insert a struct into a hive table column using HiveRunner?

If my struct column has the data type of struct<string, integer> then what should be the equivalent java object that should be inserted into that struct column? I'm trying the following code...

1 answer  ·  posted 1y ago by Abbas Gadhia‭  ·  last activity 1y ago by Abbas Gadhia‭

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highlight.js 3rd party plugin error: Cannot read properties of undefined

Highlight.js version: 11.6.0 Node version: v18.12.0 npm version: 8.19.12 When I provide a plugin with the following code to highlightjs (full code is at github): /* Language: BQN Requires: A...

1 answer  ·  posted 1y ago by Razetime‭  ·  last activity 1y ago by Razetime‭

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Strict aliasing rules and function boundaries

Let's analyze this code, assuming an architecture where the alignment of int64_t is the same as that of double: void bar(double *f, int64_t *j) { *(int64_t *)f = *j; } void foo(void) ...

1 answer  ·  posted 1y ago by alx‭  ·  edited 1y ago by Lundin‭

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How to add vertical lines for visual separation in pandas plot

MWE import pandas as pd import numpy as np import matplotlib.pyplot as plt df = pd.DataFrame(np.random.rand(9, 4), columns=['a', 'b', 'c', 'd']) df.plot.bar() plt.show() Question Ho...

2 answers  ·  posted 2y ago by mcp‭  ·  last activity 2y ago by samcarter‭

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Why is boolean value f (false) defined as a parsing-word while t (true) is not in Factor?

I noticed when attempting to generate random booleans that t and f are not treated in the same way: t random ! Error f random ! returns a value In the factor 0.98 and 0.99 documentation, t is ...

1 answer  ·  posted 1y ago by Razetime‭  ·  edited 1y ago by Alexei‭

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Cast uninitialized variable to (void)

Is it undefined behaviour to cast an uninitialized variable to (void)? Example: int main() { int x; (void)x; return 0; }

4 answers  ·  posted 1y ago by Estela‭  ·  last activity 1y ago by Ethan‭

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How do I get something similar to dictionary views, but for sequences?

The dictionary methods .keys(), .values(), and .items() all return view objects. Said objects reflect any changes to the underlying dictionary. This is often useful. Is there a way to get such a v...

1 answer  ·  posted 1y ago by ajv‭  ·  last activity 1y ago by r~~‭

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How do I serialize a const generic length array with Serde?

I have the following code: use serde::{Deserialize, Serialize}; #[derive(Sereialize, Deserialize)] struct Container<const SIZE: usize> { contents: [String; SIZE] } But I'm getti...

0 answers  ·  posted 10mo ago by mousetail‭

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Adding elements to wrapper after calling wrap doesn't work

I'm trying to do some DOM manipulation in jQuery, but am having issues with creating wrapper elements. For some reason, prepending to the wrapper doesn't work after I call wrap. Code <html>...

1 answer  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by Mithical‭

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How to compress columns of dataframe by function

Problem How can I compress each column of a dataframe to the output of a function (i.e., mean), preserving columns? MWE import pandas as pd data = {"A": [1, 2, 3, 4], "B": [5, 6, 7, 8]} ...

2 answers  ·  posted 1y ago by mcp‭  ·  last activity 10mo ago by mr Tsjolder‭

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Problems with Google Apps Script API JavaScript "How to... Execute function"

As this is the first question about Google Apps Script, here is a very brief description: it is a platform that helps people easily get programmatic access to Google apps data like Gmail messages, ...

1 answer  ·  posted 11mo ago by Wicket‭  ·  last activity 11mo ago by Wicket‭

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Python Parallel plotting and and input reading

Hello everyone, I am seeking help with understanding why multithreading does not work correctly in this example: import time import matplotlib.pyplot as plt import concurrent.futures voltage...

1 answer  ·  posted 1y ago by kek‭  ·  edited 1y ago by kek‭

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Running mvn validate does not show rules passed message though it should

My large, multi-module Maven project validation (Maven Enforcer plug-in) is playing tricks on me. moduleA> mvn validate correctly finds all modules runs enforcer on all of them displays co...

0 answers  ·  posted 11mo ago by LAFK‭

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Updating the database reverses previous changes

The Code using Microsoft.EntityFrameworkCore; public class BloggingContext : DbContext { public DbSet<Blog> Blogs { get; set; } public DbSet<Post> Posts { get; set; } ...

2 answers  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by FoggyFinder‭

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Clear selectManyMenu component if user unselects item in JSF 2

I am working with JSF 2.3 and have a selectManyMenu component that is marked as required but that I want to be cleared if the user unselects all items. Currently, the user can unselect all items, b...

1 answer  ·  posted 11mo ago by tarhalda‭  ·  edited 8mo ago by BalusC‭

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How to solve the "Cannot call from this context" error?

Temporary notice: this is part of an ongoing project of transferring and splitting my canonical from Stack Overflow on common errors in Google Apps Script. As soon as the Q&As are finalized, ...

1 answer  ·  posted 10mo ago by Oleg Valter‭  ·  last activity 10mo ago by Oleg Valter‭

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How can I output / display multiple values, with controlled spacing, without building a string?

I know that I can display a single string in the terminal window like print("example") (or similarly with a string in a variable), and I know how to open text files and write to them. I also know ...

1 answer  ·  posted 10mo ago by Karl Knechtel‭  ·  last activity 10mo ago by Karl Knechtel‭

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How to resolve the mypy error "Returning Any from function declared to return 'Dict[str, Any]'" in Python?

I have a function that loads JSON data and is declared to return a dictionary with string keys and values of any type (Dict[str, Any]). However, mypy is raising an error stating that I am returning...

1 answer  ·  posted 10mo ago by ShadowsRanger‭  ·  last activity 10mo ago by Moshi‭

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How do I return ISO day of week in Redshift?

I have a query summarizing some transaction data that I'd like to summarize by day of week. For my use case, I need to return weekdays formatted according to ISO 8601, so Monday must be the first d...

1 answer  ·  posted 12mo ago by Sigma‭  ·  last activity 12mo ago by trichoplax‭

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Is it possible to get the current function in a trace function?

I'm trying to subclass pdb to have a debugger that, in case of a call to a decorated function, can "step in" the decorated function directly and skip the decorator content altogether. A well-behave...

1 answer  ·  posted 1y ago by luser‭  ·  last activity 1y ago by r~~‭

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Read all data from TCP stream in Rust

I'd like to write a TCP client in Rust that can receive the entire message sent by a server, but I have no information about the length of a message. I'm aware that TCP doesn't preserve message bo...

1 answer  ·  posted 1y ago by Matthias Braun‭  ·  edited 1y ago by Matthias Braun‭

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Queries to count points lying on arbitrary line

Suppose we have N points on XY plane, ie. (x, y) and x, y are integers and multiple queries where each query is of the form y = mx + c and m, c are integers. Is it possible to count number of poin...

2 answers  ·  posted 12mo ago by theabbie‭  ·  last activity 11mo ago by matthewsnyder‭

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Where did my proper divisor sum program went wrong?

Here in Python, I created a program for this challenge and I'm having trouble debugging it. I already fixed most errors I have on my program but here's what I have left: x=y=z=[];i=0.0;a=int(input...

1 answer  ·  posted 3y ago by General Sebast1an‭  ·  last activity 3y ago by hkotsubo‭

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How allocated memory is calculated?

int arr[] = {10,123,14,14,15,16}; cout<<sizeof(arr)/sizeof(arr[0]); I was reading the article. When sizeof() is used with the data types such as int, float, char… etc it simply ret...

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by Canina‭

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Delete all occurrences of a character in a webpage with vanilla JavaScript

Primarily for learning, I would like to try to delete a specific character (letter or number or special character), wherever it is in a webpage, with vanilla JavaScript. The webpage won't change a...

3 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by hkotsubo‭

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What do the number entries mean in the sympy poly.diff(...) tuple syntax?

I am looking to take a partial derivative of a sympy polynomial with respect to a symbol in the polynomial. In the sympy documentation for poly.diff(...) it gives sample code like this: from sympy ...

2 answers  ·  posted 3y ago by jrh‭  ·  last activity 3y ago by Derek Elkins‭

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A keydown event succeeds for an English letter but not for an Hebrew one, sharing the same key

I am trying to listen to the event in which the keyboard key containing the Hebrew final-letter ך is pressed. This key stands for both the English letter L and the Hebrew final letter ך. If my op...

0 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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What does a variable followed by parentheses ("ptr()") mean?

What does ptr() mean in this code? #include<stdio.h> #include<stdlib.h> void PrintHello() { printf("Hello\n"); } int Add(int a, int b) { return a+b; } int main...

2 answers  ·  posted 2y ago by dumplings‭  ·  last activity 2y ago by Martin Bonner‭

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C naming convention, module trigrams?

For my company, I'm writing naming conventions for embedded code in C language. Function names must be named in lowerCamelCase() and start with a verb. Global variables are in Maj_started_lowe...

3 answers  ·  posted 1y ago by AdriZ‭  ·  last activity 1y ago by Dirk Herrmann‭

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Freeing sub-process resources?

I'm using Python to invoke another program in a sub-process. I've noticed my memory sometimes gets so large as to crash the system, and I'm wondering if I'm not correctly cleaning up the memory som...

0 answers  ·  posted 3y ago by Hyperlynx‭  ·  edited 3y ago by Patol75‭

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How do I get the error message out of a requests exception?

I'm trying to log error messages from Requests exceptions. Example: try: make_web_request() except RequestException as ex: logging.error(ex) Example output: ERROR : ('Connection abo...

2 answers  ·  posted 3y ago by ajv‭  ·  last activity 3y ago by hoverhell‭

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How to start mysql in Manjaro from terminal?

I had installed mysql using the following command sudo pacman -Sy mysql Earlier, I was using Lampp(Xampp for Linux) where I could start using the command /opt/lampp/start start I am not sur...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

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How to manage decibel meter?

I had build an application using following source code (following the steps). package com.decibal.level; import androidx.appcompat.app.AppCompatActivity; import android.media.MediaRecorder; ...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by deleted user

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Difference between puts and print for Array

I have an array friends = Array.new friends[0] = "Mad man" friends[1] = "hey" There's two ways to print it (using print or puts). At first I tried print print friends which gave: ["Mad...

1 answer  ·  posted 3y ago by deleted user  ·  edited 2y ago by Trilarion‭

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min-height for HTML form's submit buttons from a web accessibility standpoint

I am styling a simple HTML-PHP-CSS contact form and I have considered to give some min-height pixel value CSS style to the form's submit button. I ran a Google search with the query: min-height...

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by ArtOfCode‭

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Changing the font of an entire JTable column.

I know I can change the font of each cell individually by overriding getCellRenderer(row, col) in JTable but I want to be able to change the font of an entire column at once and, ideally, have the ...

0 answers  ·  posted 3y ago by cuzzo‭  ·  edited 3y ago by cuzzo‭