The goal of this technology is to provide a mechanism for browser-based applications that need two-way communication with servers that does not rely on opening multiple HTTP connections (e.g., using XMLHttpRequest or <iframe>s and long polling).

Play may trump problem solving. When working on a problem without a specific goal, the student can try lots of things to figure out what works. In contrast, only one answer is needed to solve a problem with a single goal. A playful, exploratory mindset may map out the patterns of interactions better than a narrowly, solution-oriented perspective. As an example of this, Sweller asked students to solve some math problems. One group was asked to solve the problems for a particular variable, and the other group was asked to solve for as many variables as they could. The latter group did better later, which Sweller explained in terms of cognitive load.4

John Sweller’s cognitive load theory argues that problem solving is often inefficient.2 His studies showed that students learned to solve algebra problems faster when they were shown lots of examples of solved problems, rather than trying to solve them on their own.3

One of the fundamental goals of a blockchain is resolving the “double spend” problem. In a nutshell, this means preventing someone from sending the same coin to two people. However, beyond just simple spend transactions, it applies any time two transactions want to update the same state. This could be someone trying to duplicate Bitcoin, or two people trying to buy the same CryptoKitty. For the sake of generality, we’ll call it the “double update” problem. Fundamentally it’s about ordering: when we see two things, how do we decide which is first, and what happens to the second one?

Today, Sass uses complex heuristics to figure out whether a / should be treated as division or a separator. Even then, as a separator it just produces an unquoted string that’s difficult to inspect from within Sass.

But this solution has technical complications, and the npm and the yarn implimentations give people trouble (as of this writing there are about 40 open npm link issues and over 150 open yarn link issues). If you have tried to use symlinked dependencies while developing a package you've probably run into into a stumbling block, whether simply an unexpected unlink behavior, trouble with peer dependencies, or something bigger.

Docker returns: Client sent an HTTP request to an HTTPS server.

As you can see Rails already adds error messages from associated models and doing it wrongly: Merging together errors from different models under same has_many association. :"employments.company"=>["can't be blank"] And this is wrong.

I have been waiting for a solution for this quite a while now.

To illustrate the problem:

Most programming languages vend environment variables as strings. This leads to errors like so:

I’m going to add the API Server as an actor to my first test sequence to give some granularity as to what I’m actually testing.

As an example you might create 5 issues in between counts, which would cause the query count to increase by 5 if an N+1 problem exists.

QueryRecorder is a tool for detecting the N+1 queries problem from tests.

Is there a way to select from multiple custom tables using ActiveRecord QueryMethods? I'm trying to replicate this SQL query using Ruby's ActiveRecord Query Methods. select employee.emplid, address.location from (....) employee, (....) address where employee.emplid = address.emplid

This is a blocker for me as well, as I don't really understand how to interact with my backend while it's not implemented within sveltekit and uses cookie-based authentication.

Allows you to use sapper with an API service residing in another server. This is especially useful if your API server is written in another language

This looks cool but right now, let's say i have an external api which depends on users cookies, the cookies only gets send through internal sk endpoints while ssr even if its the same domain. Couldn't we pass the 'server' request to the serverFetch hook? I would currently have to patch package svelte kit to pass request headers to the external api or create an sk endpoint which proxies the request.

It's a chicken-and-egg-like problem: If we use module: 'commonjs', then if any TS files import ES Modules (indirectly in their dependency graph), then Node throws an error because CommonJS modules can not import ES Modules.

But more so, external style cannot be applied to a subsection of a web page unless they force it into an iframe, which has all sorts of issues of it's own which is why external CSS is usually ignored. Inline CSS is often stripped by the tag strippers who don't want you turning things on or off... and media queries shouldn't even play into it since the layout should be controlled by the page it's being shown inside (for webmail) or the client itself, NOT your mail.

Email is Hard: learn how MJML will help you.

Also cross-compatibility with mail clients can be hairy, so you should see what the industry experts are doing.

“You can’t use HTML5 or CSS3 in email.” Due to their “limited” support, the idea that using HTML5 and CSS3 in email is “impossible” remains a commonly-held notion throughout the email design industry. However, we’re calling it a complete myth.

Just because there can be issues with CSS in HTML emails doesn’t mean you should abandon efforts to use it. It all comes down to determining which codes are absolutely needed and how to style them so they can be rendered by email platforms.

You can use asset helpers if the erb is only for referencing assets:

because while dealing with interactive programs one often come across numerous hidden traps which doesn’t usually happen with ordinary sh-scripts. Though fortunately or may be not, but most of these problems generally turn up within first five minutes of the work under the script. The symptoms typically look like that author can’t pass the authentication from the script.

Really you are not the first to run into such a problem

This seems definitely better than checking for a specific return code and overriding it to 0.

ret=0

There is a tendency in short luck-heavy games to require you to play multiple rounds in one sitting, to balance the scores. This is one such game. This multiple-rounds "mechanic" feels like an artificial fix for the problem of luck. Saboteur 1 and 2 advise the same thing because the different roles in the game are not balanced. ("Oh, well. I had the bad luck to draw the Profiteer character this time. Maybe I'll I'll draw a more useful character in round 2.") This doesn't change the fact that you are really playing a series of short unbalanced games. Scores will probably even out... statistically speaking. The Lost Cities card game tries to deal with the luck-problem in the same way.

The Problem with Textbooks

Pinterest doesn’t know when the wedding never happens, or when the baby isn’t born. It doesn’t know you no longer need the nursery. Pinterest doesn’t even know if the vacation you created a collage for has ended. It’s not interested in your temporal experience.This problem was one of the top five complaints of Pinterest users.

So on a blindingly sunny day in October 2019, I met with Omar Seyal, who runs Pinterest’s core product. I said, in a polite way, that Pinterest had become the bane of my online existence.“We call this the miscarriage problem,” Seyal said, almost as soon as I sat down and cracked open my laptop. I may have flinched. Seyal’s role at Pinterest doesn’t encompass ads, but he attempted to explain why the internet kept showing me wedding content. “I view this as a version of the bias-of-the-majority problem. Most people who start wedding planning are buying expensive things, so there are a lot of expensive ad bids coming in for them. And most people who start wedding planning finish it,” he said. Similarly, most Pinterest users who use the app to search for nursery decor end up using the nursery. When you have a negative experience, you’re part of the minority, Seyal said.

Wasn't sure if this belonged as an issue in Devise or Rails though.

I have a 2 radio buttons with the same id and label, only different values, (true, false)....anything I can do to choose false?

   Ambiguous match, found 2 elements matching visible field "name" that is not disabled

// WRONG ❌ - values.myField might be undefined! if (!values.myField.match(/myexpression/)) {

If you are doing a regular expression check, your function should handle undefined as a potential value.

It does this by creating links to specially crafted URLs using custom schemes (ie. "txmt", "subl", "mvim"). I prefer to use standard CLI vim in iTerm.

Some research led me to the --remote-tab switch that allows to open files as tabs in currently open Vim processes but it seemed to work only with the graphical interface (gvim) and not with the console (vim). But as I made some tests I found this can work with the vim in console mode

$ vim --servername local
VIM - Vi IMproved 8.1 (2018 May 18, compiled Apr 15 2020 06:40:31)
Unknown option argument: "--servername"

However, since you haven't yet provided any details about how you built with Qt (Qt isn't officially supported, so you must have used a third party derivative of vim), and you haven't provided any detailed information about what error messages or malfunctions you're having with python-complete, it's not really possible to tell you how to fix the problem and get vim working with Qt.

Now, if you also want deskopen to pass through any command-line parameters, you can instead use this slightly-modified version: #!/bin/sh desktop_file=$1 shift `grep '^Exec' "${desktop_file}" | sed 's/^Exec=//' | sed 's/%.//'` "$@" &

It sounds like a gnome-open (or the equivalent library call) bug. Reassigning.

You're right, it would solve the Nemo problem perfectly, but break a lot of other things, unfortunately.

A solution is almost indicated in the question: hinder xdg-open from choosing exo-open. A brute-force approach is to copy /usr/bin/xdg-open to /usr/local/bin (/usr/local/bin is earlier in PATH unless PATH has been modified) and to patch it to use open_generic instead of exo_open (unlike the XFCE4-specific exo-open, open_generic does honor xdg mime types)

when the link of accessing a workspace appear I only get the popup: "Open xdg-open?" and then nothing happens.

I get this itch.io message when I try to buy it, "Due to processing fees the minimum amount is 100 cents."

Tried to buy keyg at its 90% off sales price but no matter what payment method I choose I keep getting a "Due to processing fees the minimum amount is 100 cents."I'm trying to figure out if there is any way around this, and if not then why can you list a game at a price below $1 if it isn't actually possible for it to be bought at said price?

The second is that their approach of allowing standards to evolve through practical application, rather than highfalutin conjecture, is an incredibly powerful technique for problem-solving. The number of my ideas that have died on paper as I try to flesh them out are beyond count. It's the Goldilocks conundrum: the feeling that something needs to be just right before other people can see it. The IndieWeb methodology proves that this logic should just be thrown away.

Write modules that solve a problem you know

But sometimes not even that helps; the onceability factor can, ultimately, trump the usefulness.

This allows those other dependencies to share the same module instance.

Sure, you have a few extra newlines and semicolons, but the minifier will remove them anyway so no harm.

What is the point of avoiding the semicolon in concat_javascript_sources

   (intermediate value)(...) is not a function
       at something.source.js:1

   ({
     // other.js
   })()
   (function() {
     // something.js
   })();

And we shave off 6 or so seconds, that is huge.

Since the common problem with concatenating JavaScript files is the lack of semicolons, automatically adding one (that, like Sam said, will then be removed by the minifier if it's unnecessary) seems on the surface to be a perfectly fine speed optimization.

If you think that for every problem there is a simple and easy solution, either you don't understand what is a problem or you don't understand what is a solution.

Sprockets 4: The effect of config.assets.debug does not match the rails documentation.

concatenation still occurs.

I'm kinda stuck at the moment, going around in circles. Everything is really heavily coupled. I would like to get to the point where no load is called from within processors, but i'm not sure if that's possible. Currently the API and the caching strategies are fighting me at every step of the way. I have a branch where i'm hacking through some refactoring, no light at the end of the tunnel yet though :(

For the $$$ question, nothing comes to mind. These problems i'm hitting up against are larger than a contractor could solve in a few hours of work (which would be hundreds/thousands of dollars).

Progress is slow though. I want to change how assets are loaded, the current implementation of "pipelines" is challenging to work with.

still compiles everything into single CSS/JS files

it's super hard to test master because i have no idea which gems need to be updated. is there a guide on how to take a rails 4.2 project to master sprockets without everything mysteriously exploding? ill try to make a repro case but its hard to tell where to even start

I don't myself understand what's going on, it clearly has something to do with source maps, but may also have to do with other sprockets changes.

I don't really understand what's going on. Clearly source maps have something to do with it -- a source map feature that doesn't handle SCSS very well, apparently.

Is there a PR to... something? sassc-rails? That would make the patch not necessary? (I don't know if there's any good way to monkey-patch that in, I think you have to fork? So some change seems required...) Should the defaults be different somehow? This is very difficult to figure out.

Is there a PR to... something? sassc-rails?

I'm not sure about all consequences of my change and this is very complex.

Validating forms has notoriously been a painful development experience. Implementing client side validation in a user friendly, developer friendly, and accessible way is hard. Before HTML5 there was no means of implementing validation natively; therefore, developers have resorted to a variety of JavaScript based solutions.

Redesigning the pieces was very difficult work, because traditional pieces have 4 specialties below.

Shogi is a classic game. I know many people who want to play Shogi, but the Kanji on the pieces makes it too hard to master. I have designed this Shogi with icons so anybody can learn it easily.

the Activity component is the heart of TRB

Maintaining the builds of your repositories should be everyone’s job. Instead of relying on that one build person in the team, Travis CI makes infrastructure and configuration a team responsibility.

Those things are someone else’s job, not ours, you know. 

Instead of having this confusing maze of lambdas, regexes, and strings, we could, in theory, introduce a single entry point of configuration for Sprockets to use, and in that file declare all assets we wanted to compile. Well, that’s exactly what the manifest.js file is.

we also wrap them in Failure to solve the second problem: spotting potential exceptions is hard

It turns out that, given a set of constraints defining a particular problem, deriving an efficient algorithm to solve it is a very difficult problem in itself. This crucial step cannot yet be automated and still requires the insight of a human programmer.

I wanted to keep reviewing restaurants, but I didn’t want to go back into their dining rooms both because of the risk and because I was afraid readers would take it as an all-clear signal. When the governor halted indoor dining again in December, my selfish reaction was relief. Then I briefly got depressed. How would restaurants survive? And how would I keep writing about them?One answer had already started to appear on sidewalks and streets in the form of small greenhouses, huts, tents and yurts. Inside these personal dining rooms, you can (and should) sit just with people from your own household. If the restaurant thoroughly airs the space out between seatings, any germs you breathe in should be the same ones that are bouncing around your home. Many restaurants instruct their servers to stay outside the structures as much as possible, though some don’t.

It is difficult to come up with content that is not extracted from a real application. Manufacturing scenarios to see if ideas have practical application turned out to be an exhasting and time consuming process.

That's the whole point of an abstraction layer—to isolate your business logic from a subsystem's mechanics

An additional usecase is where we would like to update multiple records

This can be useful in cases like multistep registration. Previously in # rails we used to stick all of the validations in the class and then we're # stuck validating them all everytime

However, sometimes actions can't be rolled back and it is unfortunately unavoidable. For example, consider when we send emails during the call to process. If we send before saving a record and that record fails to save what do we do? We can't unsend that email.

In many communities, it’s not just discrimination, but gender-based violence that keeps girls off the playing field.

Similarly, in the sports arena, we see massive gaps in the prize money, sponsorships, facilities and equipment allocated to women athletes

At the same time, the world of sport remains plagued by many of the same gender inequalities that we see more broadly; issues such as unequal pay, gender-based violence, a lack of targeted investment and negative stereotypes and social norms

Report: This price didn't exist on the store This price did show on the store but the game could not be bought This was a very short price made by a mistake (glitch)

I don't see a way to hook into Devise's route mapping load process to add the action (several monkey patching attempts failed)

Unlike naming children, coding involves naming things on a daily basis. When you write code, naming things isn’t just hard, it’s a relentless demand for creativity. Fortunately, programmers are creative people.

violates our expectation that hard things should be technical

Scalability is the problem you want to have, and sooner rather than later, but maintainability is the problem you’re definitely going to have, sooner or later.

So the hard and unsolvable problem becomes: how up-to-date do you really need to be?

After considering the value we place, and the tradeoffs we make, when it comes to knowing anything of significance, I think it becomes much easier to understand why cache invalidation is one of the hard problems in computer science

the 2 hardest problems in computer science are essentially the 2 hardest problems of life in general, as far as humans and information are concerned.

Yes, i'm trying to find the union of two relations

You use grid-area, so the place for the side nav is allocated at start. If you hide (or even delete) the side nav, that won't change anything about this. You have to do a little trick: Set the width for the first column to 0 and change the grid-gap because otherwise you will have a (not needed) gap at the left.

Setting up docker-ce

it still hangs when installing

Ok, fixed it by upgrading docker

So, what I've discovered in a meanwhile. It was an ubuntu-docker issue. Recently I upgraded my ubuntu from 16.04 to 18.04. This change seems to be incompatible with the docker version I had, 1.11.0.

1) QT Apps load very slow in startup (ex, qpdfview, Audacious), had to look at Ubuntu forums to find a solution installing kvantum and KvYAru theme, so this is solved at the moment; but the theme (SVG based, cannot modify it in a text file) have orange highlights, not consistent with Mint-Y theme, but it is the best option at the moment. This temporary solution I found was here: https://itectec.com/ubuntu/ubuntu-qt-apps-are-very-slow-to-load-in-xubuntu-20-04-when-export-qt_qpa_platformthemegtk2-is-enabled/

I think some of the design details are insane (I dislike the binary logs, for example), but those are details, not big issues.

Systemd problems might not have mattered that much, except that GNOME has a similar attitude; they only care for a small subset of the Linux desktop users, and they have historically abandoned some ways of interacting the Desktop in the interest of supporting touchscreen devices and to try to attract less technically sophisticated users. If you don't fall in the demographic of what GNOME supports, you're sadly out of luck.