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.

Published: Mar 20, 2025
Author: Puneeth kumar
System Analyst

TimescaleDB

When working with time series data like stock prices, website traffic, or error logs, the volume of data grows rapidly over time. In traditional relational databases like PostgreSQL and SQL, this can lead to slower query performance as the dataset becomes larger.

One alternative is to use NoSQL databases, but they come with their own challenges, such as lack of strong ACID compliance, complex querying, and difficulties in handling structured relational data.

TimescaleDB, which is built on top of PostgreSQL, offers a powerful solution by introducing hypertables - a special type of table optimised for time series data. Hypertables enable faster read and write operations, automatic partitioning, and efficient data compression. Additionally, TimescaleDB provides advanced analytical functions, making it easier to perform complex queries for reporting, trend analysis, and forecasting. This makes it a great choice for applications that require efficient storage and analysis of large-scale time series data.

#databases #time_series_data #timescale_db #postgres

Published: Mar 19, 2025
Author: Aditya Vishwakarma
System Analyst

We can't use turbo frame for table rows, because html doesn't allow external tag like turbo frame inside the table.

The workaround this is to just have unique id for element you want to modify and use turbosteam to modify only that element.

#rubyonrails #turbo #turboframes #spa

Published: Mar 19, 2025
Author: Satya

in ruby https://nil.to|nil.to_i => 0 & https://nil.to|nil.to_f => 0.0
#ruby, #nil-conversion

Published: Mar 18, 2025
Author: Sujay

Steps to merge one repo into another

Step 1: Clone Repo1 locally

Code

git clone  repo1
cd repo1

Step 2: Fetch all the branches and commits from Repo2

Code

git remote add repo2 
git fetch repo2

Step 3: Create a branch

Code

git checkout -b merge-repo2

Step 4: Merge keeping full history

Code

git merge --allow-unrelated-histories repo2/main (Since the repositories have separate histories, this option allows Git to combine them, potentially requiring manual conflict resolution)

Step 5: Resolve Merge Conflicts

Code

git add .
git commit -m "Resolved merge conflicts"

#git

Published: Mar 18, 2025
Author: Mohammad hussain
System Analyst

pagy_array This method is the same as the generic pagy method, but specialized for an Array.

Ruby

require 'pagy/extras/array'
@pagy, @items = pagy_array(an_array)

#CU6U0R822 #ruby

Published: Mar 18, 2025
Author: Mohammad hussain
System Analyst

```
pagy_array

Published: Mar 13, 2025
Author: Nived Hari
System Analyst

each_with_object is an enumerable method in Ruby that allows you to iterate over a collection while building up an object (like an array or hash). Unlike map, which creates a new array, each_with_object lets you modify an existing object in a single pass.

Syntax

Ruby

collection.each_with_object(initial_object) do |item, object|
  # Modify the object inside the block
end

• collection: The array or enumerable you're iterating over.
• initial_object: The object that will be modified (e.g., {} for a hash or [] for an array).
• item: The current element in the iteration.
• object: The object that accumulates the results.
Example Usage
Using each_with_object with a Hash

Code

numbers = [1, 2, 3, 4, 5]
squares = numbers.each_with_object({}) do |num, hash|
  hash[num] = num**2
end

puts squares
# Output: {1=>1, 2=>4, 3=>9, 4=>16, 5=>25}

Why use each_with_object?
• Avoids the need to initialize an empty {} before the loop.
• Eliminates the need to return the object explicitly.

#CU6U0R822 #ruby

Published: Mar 13, 2025
Author: Mohammad hussain
System Analyst

When to use collection_select over select in rails
Use collection_select when you need to populate a dropdown with a collection of ActiveRecord objects. It is built on top of select and provides a convenient way to display object attributes instead of a simple array of strings.
select is used for manually defining options, typically from an array of strings or key-value pairs.
collection_select is specifically designed for selecting records from an ActiveRecord collection, making it useful when working with database associations.

Published: Mar 12, 2025
Author: Nived Hari
System Analyst

Rake tasks in Rails let you run custom scripts from the command line.
You can define your own tasks inside the lib/tasks directory.

How to Create a Custom Rake Task

1. Create a new .rake file in lib/tasks/

Code

touch lib/tasks/custom_tasks.rake

Define the task inside the file:

Code

namespace :custom do
  desc "Say hello from a custom rake task"
  task :hello do
    puts "Hello from custom Rake task!"
  end
end

Run the task from the terminal:

Code

bin/rake custom:hello

Use :environment if your task interacts with the database or models

#CU6U0R822 #rake

Published: Mar 12, 2025
Author: Nived Hari
System Analyst

The inverse_of option in ActiveRecord helps Rails recognize bidirectional associations in memory, reducing redundant database queries.
For example:

Code

class Employee < ApplicationRecord
  belongs_to :department, foreign_key: 'department_code', primary_key: 'code', inverse_of: :employees
end

class Department < ApplicationRecord
  has_many :employees, foreign_key: 'department_code', primary_key: 'code', inverse_of: :department
end

Why Use inverse_of?
• Prevents extra queries when accessing related objects
• Keeps objects in memory, improving performance
• Ensures associated objects reference the same instance
Without inverse_of, Rails may reload the association unnecessarily:

Code

employee = Employee.first
department = employee.department  # Triggers a SQL query
department.employees.include?(employee)  # Without `inverse_of`, this could trigger another query

With inverse_of, Rails avoids the extra query because it knows department.employees already includes employee

#CU6U0R822 #active_record

Showing page 8 of 83

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Legacy systems block everything

Aging, undocumented codebases make AI integration slow, risky, and expensive. They need to move first.

Don't worry. We've got you covered.

Start with the audit.

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TILs - Fueling Curiosity, One Insight at a Time

Code

Code

Code

Code

Code

Ruby

Ruby

Code

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Code

Code

Code

Code

Your competitors are already using AI.The question is how fast you want to unlock the value.

Don't know where to start?

Your data isn't ready

Internal teams are stretched

Legacy systems block everything

Don't worry. We've got you covered.

Your competitors are already using AI.
The question is how fast you want to unlock the value.