teleren/devto huggingface dataset:
Ecto order by a dynamic fragment
Tags: ecto, elixir, phoenix, mysql
Published: 2024-02-20 14:35:21

---
title: Ecto order by a dynamic fragment
published: true
description: Generate a dynamic sort by for you query
tags: Ecto, Elixir, Phoenix, MySQL
# cover_image: https://direct_url_to_image.jpg
# Use a ratio of 100:42 for best results.
# published_at: 2023-09-12 09:29 +0000
---

## Problem description:

Urgent need to return the results of a query in a predefined sort order by id. The project uses Ecto, MySQL and in SQL the sorting would look like this:

```SQL
ORDER BY FIELD(id, 5, 1, 2)
```

and in Ecto something like this:

```Elixir
|> order_by(q, fragment("FIELD(?, ?, ?, ?)", q.id, 5, 1, 2))
```

Looks good! dosen't it?

No. The problem is that the list of ID's is dynamic, including its size. And this means two things
1. `fragment` function should be called with different arity based on values provided at runtime. (e.g. `fragment/5`, `fragment/10`, ...)
2. first parameter of the `fragment` function changes at runtime as well because we need as many question marks as there are elements in the list + 1 for the field reference.

And out of nr. 2 comes another problem. 
We can not just pass an interpolated string to fragment as this is not allowed do to potential SQL injections.

```
(Ecto.Query.CompileError) to prevent SQL injection attacks, fragment(...) does not allow strings to be interpolated as the first argument via the `^` operator
```

## Solution `splice`:

If you are or have the possibility to upgrade your Ecto version to `3.11` or above you can use [`splice(list)`](https://hexdocs.pm/ecto/3.11.0/Ecto.Query.API.html#splice/1)

```Elixir
fragment("? in (?)", p.id, splice(^[1, 2, 3]))
```

and this will be the same as 

```Elixir
from p in Post, where: fragment("? in (?,?,?)", p.id, ^1, ^2, ^3)
```

I first encountered this problem before ecto 3.11 and if you are on an older project and not able to upgrade your version of ecto there are few options for you

1. Reconsider upgrading Ecto
2. Try [backporting `splice`](https://github.com/elixir-ecto/ecto/blob/a5187f3b7aef528b501cd505de4ac1a656b43634/lib/ecto/query/builder.ex#L688)
2. Write a less sophisticated macro that serves your specific needs


## Resources: 

https://hexdocs.pm/ecto/3.11.0/Ecto.Query.API.html#splice/1
https://stackoverflow.com/questions/59042043/using-unquote-splicing-in-macros-with-modified-lists
Pros and Cons of Arrays in Java
Published: 2024-02-20 14:29:17

Arrays are a fundamental data structure in Java, and they provide a convenient way to store and manage elements. 

While arrays are useful, they also have disadvantages. Here's a breakdown of the pros and cons of using arrays in Java.

#### Pros of Arrays

1. **Speedy Element Access:** Arrays allow for quick access to any element. This is because elements in an array are stored in contiguous memory locations, enabling direct access via each element's index.

2. **Versatile Storage:** An array can store various types of data, including strings, primitive data types (like int), and objects from any class you create.

3. **Built-in Java Support:** Being a core part of the Java language, arrays do not require imports to be used. This built-in support simplifies coding and reduces the need for external dependencies.

#### Cons of Arrays

Despite their advantages, arrays have certain drawbacks that can limit their usefulness in many scenarios.

1. **Fixed Size:** Perhaps the most significant limitation of arrays is their fixed size. Once an array is created, its size cannot be altered. If you need to store more elements than the array can hold, you'll need to create a new, larger array and copy the elements from the old array to the new one, which can be an inefficient way to handle your program. 

2. **Inefficient Resizing:** Related to the fixed size issue, resizing an array to accommodate more elements or to shrink its size is cumbersome and resource-intensive. This resizing process involves creating a new array and manually copying elements, which can be time-consuming and waste resources.

3. **Wasted Memory Space:** If an array is allocated more space than it needs, it can lead to inefficient use of memory. This is particularly problematic when memory usage is a critical concern.

4. **Difficulty in Removing Elements:** Arrays do not provide a straightforward way to remove elements. To delete an element from the middle of an array, you typically have to shift all subsequent elements one position to the left.
Understanding Float vs. Double in C and C++
Tags: programming, c, cpp, datatypes
Published: 2024-02-20 14:28:22

In programming with C and C++, choosing the right data type for floating-point numbers is crucial for the accuracy and efficiency of your calculations. Two primary data types for this purpose are `float` and `double`. Understanding their differences in precision and range can help you make informed decisions in your coding projects.

## Float vs. Double: A Comparison

- **`float`**: A single-precision floating-point data type that typically requires 32 bits of memory. It provides approximately 7 decimal digits of precision (24 bits for the mantissa) and has a range of about 1.4E-45 to 3.4E+38.

- **`double`**: A double-precision floating-point data type that typically requires 64 bits of memory. It offers approximately 15 decimal digits of precision (53 bits for the mantissa) and has a range of about 4.9E-324 to 1.8E+308.

## Accuracy and Precision

The terms accuracy and precision are crucial when discussing floating-point representations:

- **Accuracy** refers to how close a measured or calculated value is to the true value.
- **Precision** indicates the level of detail in the representation, often related to the number of significant digits that can be reliably used.

Given these definitions, `double` provides greater precision than `float` because it allocates more bits to represent the significand (mantissa) and exponent. This allows `double` to represent both larger and smaller numbers more accurately and with more significant digits.

## Misconceptions About Float and Double

There's a common misunderstanding that `float` can be more precise than `double` in certain contexts. This might stem from specific scenarios where the precision of `float` is deemed sufficient, and using `double` doesn't offer a practical benefit. However, in terms of raw computational precision, `double` is inherently more accurate due to its larger size.

## Conclusion

Choosing between `float` and `double` depends on your application's needs, including precision requirements, performance considerations, and memory usage. For most high-precision calculations, `double` is the preferred choice. Understanding the distinctions between these two data types is essential for effective programming in C and C++.
Streamlined RCM with Skilled Nursing Facility Billing Services
Tags: snf, skillnurshingfacility, snfservices
Published: 2024-02-20 14:20:00

Billing operations at skilled nursing facilities are complicated. These facilities are often required to prepare consolidated medical bills. These consolidated bills are prone to errors.

Skilled nursing facilities or SNFs are usually short-staffed. And that is why professional skilled nursing facility billing services can improve accuracy and reduce labor costs. Also, the recent hike in minimum wages across some states in the US has left SNFs struggling to employ, train, and re-hire SNF billing and coding staff.

Given these pressures, it’s not surprising that more and more skilled nursing facilities are looking to partner with trusted medical billing companies to reduce billing errors and admin costs.

So, if you are looking for a medical billing partner that increases efficiency & accuracy while cutting costs by up to 80%, Sunknowledge is the right medical billing partner for your skilled nursing facility.

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Besides the expert services of our billing staff for skilled nursing facilities, our clients benefit from our adherence to a well-structured medical billing workflow and successful implementation of industry best practices.

List of some of our skilled nursing facility billing best practices:

- Regular billing and coding workshops & training sessions
- Billing audits to check for errors or inconsistencies
- Tracking KPIs to ensure optimal billing performance
- Swift feedback mechanism to eliminate operational errors

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)_** or to get our list of excellent references, please feel free to reach out to Sunknowledge.
Top 5 Driving Schools That Guarantee Safe and Confident Drivers
Published: 2024-02-20 14:11:18

Driving is a vital skill that grants independence and opens up opportunities for individuals. However, mastering this skill requires proper training and guidance from experienced professionals. With countless [driving schools](https://ctplahore.gop.pk/driving-schools) claiming to offer the best instruction, finding the right one can be overwhelming. To ease your search, we've compiled a list of the top 10 driving schools renowned for producing safe and confident drivers.

## 1. Safe Drive Driving School

Safe Drive Driving School prioritizes safety above all else. With a team of certified instructors and a comprehensive curriculum, they ensure that students learn defensive driving techniques and road safety rules. Their personalized approach caters to the individual needs of each student, resulting in confident drivers prepared for any situation on the road.

## 2. Confidence Behind the Wheel Academy

Confidence Behind the Wheel Academy focuses on building confidence in nervous or hesitant drivers. Through patient instruction and encouragement, they help students overcome their fears and develop the skills necessary for safe driving. With a high success rate and positive testimonials, this school instills a sense of empowerment in its graduates.

## 3. Expert Drive Education Center

At Expert Drive Education Center, excellence is the standard. Their team of expert instructors utilizes advanced teaching methods and state-of-the-art facilities to deliver top-notch driver education. From beginner lessons to advanced defensive driving courses, they offer comprehensive training programs that produce skilled and confident drivers.

## 4. Road Masters Driving Institute

Road Masters Driving Institute boasts a track record of producing drivers who excel on the road. Their structured curriculum covers all aspects of driving, including traffic laws, vehicle maintenance, and emergency maneuvers. With a focus on hands-on experience and real-world simulations, graduates of this institute emerge as competent and self-assured drivers.

## 5. Drive Wise School of Motoring

Drive Wise School of Motoring emphasizes the importance of responsible and mindful driving. Through interactive lessons and practical exercises, they instill in students a deep understanding of road etiquette and situational awareness. Their holistic approach to driver education ensures that graduates uphold high safety standards throughout their driving careers.
How Crypto Index Funds Can Help Safeguard Against Inflation?
Tags: cryptocurrency, web3, ethereum, bitcoin
Published: 2024-02-20 14:06:57

Inflation poses a significant threat to traditional investment portfolios, particularly in regions with volatile currencies like Turkiye and Nigeria. In such environments, safeguarding wealth against the erosive effects of inflation becomes paramount. Enter crypto index funds – a powerful tool for mitigating the impact of inflation and preserving purchasing power in the face of economic uncertainty.

As economies grapple with rising inflation rates, investors seek alternative assets that can provide a hedge against currency devaluation. Crypto index funds offer a compelling solution by providing exposure to a diversified basket of cryptocurrencies, which have historically demonstrated resilience to inflationary pressures. By investing in a range of crypto assets through a single fund, investors can spread risk and potentially generate returns that outpace inflation.

JoinClamp's crypto index funds are specifically designed to address the challenges posed by inflation. By carefully selecting a diverse range of cryptocurrencies, including stablecoins and inflation-resistant assets like Bitcoin and Ethereum, JoinClamp offers investors a robust hedge against currency devaluation.

In regions experiencing hyperinflation, such as Venezuela or Zimbabwe, crypto index funds can offer a lifeline to individuals seeking to preserve their wealth. By diversifying across multiple crypto assets, investors can protect themselves from the devastating effects of hyperinflation while maintaining liquidity and accessibility to their funds.

Additionally, [JoinClamp's](https://joinclamp.com) on-ramp and off-ramp features provide seamless access to crypto markets, allowing investors to easily convert between fiat and digital assets. This accessibility is particularly crucial for individuals in high-inflation countries, where traditional banking systems may be unreliable or inaccessible.

In conclusion, crypto index funds offered by [JoinClamp](https://joinclamp.com) present a compelling opportunity for investors to safeguard against inflation and protect their wealth in an increasingly uncertain economic landscape. By diversifying across a range of crypto assets and leveraging innovative investment strategies, [JoinClamp](https://joinclamp.com) empowers investors to navigate the challenges of inflation with confidence.
Using == vs the equals() Method in Java
Published: 2024-02-20 14:05:53


The == operator is used to compare the identities of reference data types (not the contents of primitive data types). 

It basically checks if the references point to the same object. Even if the actual values in those two objects are identical, it will return a false value if they are separate objects. 

## 
Using the Equals() Method

If you want to compare the contents of reference data types, then you should use the Equals() method, which is available via the Object class, although must override it in the classes you create. 


For example, let’s say we would like to compare two student IDs to check if they are the same. We can use the equals() method.  

Here’s a walkthrough: 

Let’s say we created a studentID in the class Student: 

private int studentID;

Now, we want to create a method to compare two student IDs. 

To start with, you have to declare the method and pass an Object as the parameter: 

_public boolean equals(Object obj);_

The next line will use the == operator, already discussed, to check if the objects we will be comparing are the same object in the memory. If they are, there will be no more need to continue with the code. 

_if (this == obj) return true;_

If they are not the same object, we must check if the Object passed as a parameter is of the class Student so we can compare the IDs: 

_if (obj instanceof Student){_

If it is, we can proceed with casting the object as a Student object, after which we can compare it: 

_Student a = (Student) obj;_

Now we can compare the values of current student ID and that belonging to the Object typecast to a Student object “a”:

_return studentID == a.studentID;_

Remember to include an else block, which specifies that if the passed object was not an object of the class Student, we simply call the equals() method of the superclass: 

_else{
return super.equals(obj)
}_

Let’s see the entire code again: 

@_Override 
public boolean equals(Object obj){
if (this == obj) return true; 
if (obj instanceof Student){
    Student a == (Student) obj;
    return studentID = a.studentID;
    }
    else{
     return super.equals(obj)
    }
}_
_
Westminster Medical Group
Published: 2024-02-20 14:04:32

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SRS For App Development
Tags: srs, beginners, tutorial, guide
Published: 2024-02-20 14:03:03

Hello all! I'm starting from square one with no coding experience trying to get my sword and shield to start my app development journey. 
I've done some research of which I'm currently studying the Software Development Life Cycle and I'm wondering if the SRS is just a standard process or if the steps change depending on development because I'm having a hard time finding an app specific SRS template.

Does anyone know of a book, website, template I could get that is easily understood by beginners? 

I'm thinking of getting 'Software Requirements Specification A Complete Guide' By Gerardus Blokdyk.

All tips & info appreciated Thanks! :-)
Hey Chads, share your Neovim and Tmux Config
Tags: discuss, programming, vim, productivity
Published: 2024-02-20 13:57:35

Hi devs, if you are a Neovim or Tmux user, or use either one of them, feel free to share your configs for everyone to take a look at.

Here is mine: https://github.com/shricodev/dotfiles.git

> 🫵 **NOTE**: If you use any other IDEs or tools, other than Neovim or Tmux, feel free to share your configurations as well.
Ports for ssh, scp, rsync
Tags: ssh, scp, rsync, ports
Published: 2024-02-20 13:48:02

> [Original post](https://studioagenturbuero.com/archive/2022/ssh-port-args/) on my blog, happy to include feedback!
Cover: [Théophile Steinlen](https://www.britishmuseum.org/collection/object/P_1949-0411-4999-1-26), via [Clawmarks](https://clawmarks.tumblr.com/post/735451976573255680/des-chats-th%C3%A9ophile-alexandre-steinlen-1898)

Have to look[^1] this[^2] up[^3] every time[^4]:

Assuming you're connected to a machine like

	ssh user@my.host.server

and want to transfer files afterwards, you'll likely update your recent command to

	scp user@my.host.server:/my/folder/my.file dest/folder

or

	rsync -a user@my.host.server:/my/folder dest/

for copying said files. So far, so good.

When relying on ports, this gets way more complicated due to differing parameter styles for each command which are

```sh
# `-p[port]`
ssh -p222 user@my.host.server

# `-P [port]`
scp -P 222 user@my.host.server:/my/folder/my.file dest/folder

# set port on custom remote shell
rsync -a -e "ssh -p222" user@my.host.server:/my/folder/my.file dest/folder
```

(Note that rsync has more options for defining TCP daemon ports with `--port=[PORT]` which is probably not what you want)

You're welcome!


[^1]: [ssh manpage](https://man.openbsd.org/ssh)

[^2]: [scp manpage](https://man.openbsd.org/scp)

[^3]: [rsync manpage](https://download.samba.org/pub/rsync/rsync.1)

[^4]: Find [offline documentation tools](https://unix.stackexchange.com/questions/195179/is-there-a-linux-graphics-program-that-displays-man-commands-in-a-browser) on Stackoverflow … or use [Dash](https://blog.kapeli.com/linux-man-pages-in-dash) on Macs and [Zeal](https://zealdocs.org/) [man docsets](https://github.com/zealdocs/zeal/issues/115#issuecomment-308795433) on Windows
Microsoft PowerPoint Free Download
Tags: webdev, javascript, beginners, programming
Published: 2024-02-20 13:40:01

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Published: 2024-02-20 13:34:59

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Dr.FarFar Software Developer
Tags: webdev, beginners, programming, tutorial
Published: 2024-02-20 13:32:59

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