TILs - Fueling Curiosity, One Insight at a Time

At Codemancers, we believe every day is an opportunity to grow. This section is where our team shares bite-sized discoveries, technical breakthroughs and fascinating nuggets of wisdom we've stumbled upon in our work.

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Author
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Iffyuva
This website https://www.colorhexa.com/ is pretty good. Given a color, say #E4F6FC, it can explain the color, and also suggest a closest websafe color
Published
Author
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Satya
Let's say we have an api function

Code

export const getTheResults = async (params) => {
  const response = await axios.get(
    /api/v1/example.json?${stringify(params)}
  );
  return response.data;
};


the param is an object mentioned below , and we are stringifying it before sending the request to backend.
Note: we are using stringify from qs npm package.
const params = {
key1: "value1",
key2: "value2",
key3: ["value3", "value4"],
}
the stringified output will be - > key1=value1&key2=value2&key_3%5B0%5D=value3&key_3%5B1%5D=value4 i.e key1=value1&key2=value2&key_3[0]=value3&key_3[1]=value4
but backend is expecting to receive it without the index values i.e key1=value1&key2=value2&key_3[]=value3&key_3[]=value4
So in order to send the parameters like that , we can just pass a stringify option called arrayFormat: "brackets"

Code

eg: export const getTheResults = async (params) => {
  const response = await axios.get(
    /api/v1/example.json?${stringify(params, {arrayFormat: "brackets"})}
  );
  return response.data;
};


Published
Author
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Sujay
When using Rails strong parameters feature to permit certain parameters in controller and if any specific param has array values, we need to permit it as an array explicitly


Code

Eg:
Request: /api/v1/calendar.json?date_from=&date_to=&hotel_id[]=1&hotel_id[]=2

def permit_params
  params.permit(:date_from, :date_to, hotel_id: []) # hotel_id: [] is important
end

Published
Author
user-image
Sujay
When working with components that have predefined classnames but require occasional overrides based on specific use cases, it's common to encounter scenarios where developers resort to using the !important CSS rule to forcefully apply style changes. However, this approach is considered an anti-pattern as it can lead to specificity conflicts and maintenance issues down the line. A more effective solution to this problem is provided by the Tailwind Merge package, available at https://github.com/dcastil/tailwind-merge.
Published
Author
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Sujay
Managing multiple variants of a component, such as different styles of buttons, can often be a challenging task, especially as the number of variants grows. Traditionally, developers have resorted to using packages like classnames to dynamically apply classes based on different conditions. However, a more streamlined and organized approach is provided by Class Variance Authority (CVA). CVA offers an elegant solution to handling multiple component variants, promoting maintainability and scalability.

One typical example is the "Button" component, which can possess various visual treatments like primary, secondary, with icons, and diverse icon placements. Instead of relying on cumbersome conditional statements and the classnames package, Class Variance Authority presents an efficient methodology through its documentation, available at https://cva.style/docs.
Published
Author
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Iffyuva
In order to disable pager in postgresql, just use this command \pset pager off. This command is useful for seeing data from tables with huge jsonb data
Published
Author
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Ashwani Kumar Jha
Senior System Analyst
JSON serialization in API responses omits fields with undefined value to follow the JSON specification. According to the JSON standard, properties with undefined values are not allowed in JSON objects, these are the allowed JSON values: object, array, number, string, true, false, or null.

We need to be mindful while handling the missing data. On the backend, use null or defaults for missing data. On the frontend, ensure data is present before accessing it.
Published
Author
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Ashwani Kumar Jha
Senior System Analyst
Image Sprites

• Technique to reduce server requests for loading multiple images.
• Combine several small images into a single, larger image called a sprite sheet.
• Instead of loading multiple individual images separately, we can load a single sprite sheet.
• We can refer to individual images within the sprite sheet using CSS background positioning.

Code

// let's say we want to show logos of our client

.logo {
  background-image: url('client-logos-sprite.png');
  background-repeat: no-repeat;
}

.client1 {
  background-position: 0 0;
}

.client2 {
  background-position: -100px 0;
}


Published
Author
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Rishav Raj
System Analyst
How to fetch and test those API endpoints which is accessible after login into the applications.

1. Launch the browser navigate to the login page using playwright
2. Enter the login credentials and submit the form to login.
3. After successful login, use playwright API to access the API endpoints.
4. Make API requests and assert the response to validate the functionality
Example of fetching API after login :


Code

// implementation of login test

const apiEndpointURL = "https://example.com/api/endpoint";
const apiResponse = await page.evaluate(async (url) => {
      const response = await fetch(url);
      return await response.json()
}, apiEndpointURL)

console.log(apiResponse)


Thanks
Published
Author
user-image
Sujay
Monkey patching in Ruby is dynamic modification of class. It means overwriting existing methods at runtime
eg:

Code

class String
  def reverse
    'Reverse op blocked'
  end
end

'Hello'.reverse
>> 'Reverse op blocked'

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