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.
Apr 29, 2025
rails_representation_url
in Rails is used to generate a URL for a variant of an Active Storage image, not the original blob. It's especially useful when we want to apply transformations like resizing or converting image formats on-the-fly.
rails_representation_url(
image.variant(resize_to_limit: [300, 300], saver: { quality: 80 }, format: :webp).processed,
only_path: true
)
•
image.variant(...)
creates a variant of the image, resizing it to a maximum of 300x300 pixels, converting it to WebP format, and reducing its quality for optimization.•
.processed
ensures the variant is actually processed before generating the URL.•
rails_representation_url(...)
then generates the URL for this transformed version.•
only_path: true
returns a relative path (instead of a full URL), which is often preferred in views or frontend routing.This is a great way to deliver performance-optimized images for the UI
#rubyonrails
Syed Sibtain
System Analyst
Apr 28, 2025
Rails provides a https://api.rubyonrails.org/classes/ActiveRecord/TokenFor.html#method-i-generate_token_for|generates_token_for method on Active Record models, which can generate unique tokens for records — including support for expiration. This is useful for scenarios like creating unique unsubscribe links in emails. You can later retrieve a record using the generated token with the corresponding https://api.rubyonrails.org/classes/ActiveRecord/TokenFor/RelationMethods.html#method-i-find_by_token_for|find_by_token_for method.
The Rails Authentication generator utilizes this feature in its password reset flow. It uses https://api.rubyonrails.org/classes/ActiveModel/SecurePassword/ClassMethods.html#method-i-has_secure_password|has_secure_password, which by default enables password reset functionality for the user model. When you call the
By default, https://api.rubyonrails.org/classes/ActiveModel/SecurePassword/ClassMethods.html#method-i-has_secure_password|has_secure_password uses the password attribute, but you can customize this by specifying a different attribute via the
#rubyonrails #ror #authentication #token #password
The Rails Authentication generator utilizes this feature in its password reset flow. It uses https://api.rubyonrails.org/classes/ActiveModel/SecurePassword/ClassMethods.html#method-i-has_secure_password|has_secure_password, which by default enables password reset functionality for the user model. When you call the
password_reset_token
instance method on a user, it internally uses generates_token_for
to generate a unique token. You can then find the user record later using find_by_password_reset_token
.By default, https://api.rubyonrails.org/classes/ActiveModel/SecurePassword/ClassMethods.html#method-i-has_secure_password|has_secure_password uses the password attribute, but you can customize this by specifying a different attribute via the
attribute
option. If you want to disable password reset functionality, you can pass reset_token: false
to has_secure_password
(it is enabled by default). Similarly, you can disable password confirmation validations by passing validations: false
(validations are enabled by default).#rubyonrails #ror #authentication #token #password
Aditya Vishwakarma
System Analyst
Apr 23, 2025
In recent versions of Rails, the default host for the test environment has changed from https://www.example.com|www.example.com to https://example.com|example.com. However, Capybara continues to use https://www.example.com|www.example.com in most cases, which can cause URL assertions in ActionMailer tests to fail when relying on the default settings. To resolve this inconsistency, you can explicitly set default_url_options[:host] to https://www.example.com|www.example.com in test.rb.
#RubyOnRails #ROR #ActionMailer #Capybara #TDD
#RubyOnRails #ROR #ActionMailer #Capybara #TDD
Aditya Vishwakarma
System Analyst
Apr 16, 2025
SEO Best Practices:
• Meta titles should be between 50–60 characters long (including spaces).
• Meta descriptions should be between 120–160 characters (including spaces).
• Use a single H1 tag per page, followed by a clear and consistent hierarchy of H2 and H3 tags across all pages.
• All images should have meaningful
• Ensure there are no broken links; tools like Screaming Frog can help detect them.
• Include canonical tags to avoid duplicate content issues.
• Add social meta tags (Open Graph, Twitter Cards) for better link previews.
• The site should have a robots.txt file and a sitemap.xml for better crawling and indexing.
#SEOBestPractices #SearchEngineOptimization
• Meta titles should be between 50–60 characters long (including spaces).
• Meta descriptions should be between 120–160 characters (including spaces).
• Use a single H1 tag per page, followed by a clear and consistent hierarchy of H2 and H3 tags across all pages.
• All images should have meaningful
alt
tags for accessibility and SEO.• Ensure there are no broken links; tools like Screaming Frog can help detect them.
• Include canonical tags to avoid duplicate content issues.
• Add social meta tags (Open Graph, Twitter Cards) for better link previews.
• The site should have a robots.txt file and a sitemap.xml for better crawling and indexing.
#SEOBestPractices #SearchEngineOptimization
Mohammad hussain
System Analyst
Apr 14, 2025
In Rails,
When we define a
Example:
This ensures a consistent ordering across the app without needing to manually add
It's especially useful when displaying comments, messages, tasks, or anything that should appear in the order they were created.
Caution:
In that case, we would need to call
#rubyonrails
default_scope
is a way to automatically apply a query condition to every query for a model.When we define a
default_scope
, it always gets added unless we manually remove it.Example:
default_scope { order(created_at: :asc) }
This ensures a consistent ordering across the app without needing to manually add
.order(created_at: :asc)
every time.It's especially useful when displaying comments, messages, tasks, or anything that should appear in the order they were created.
Caution:
default_scope
can sometimes be annoying if we want a different order temporarily.In that case, we would need to call
.unscope(:order)
to remove it manually.#rubyonrails
Syed Sibtain
System Analyst
Apr 11, 2025
Instead of manually checking if a key exists in a hash, you can just say:
Now whenever you do:
Ruby will assume
#ruby
counts = Hash.new(0)
Now whenever you do:
counts[:apple] += 1
Ruby will assume
counts[:apple]
starts at 0
, so no errors — just clean, readable code.#ruby
Nived Hari
System Analyst
Apr 7, 2025
Traits are reusable groups of attributes that we can apply to factories conditionally.
They help avoid duplication and let us customise factories based on different test scenarios.
We can define a trait inside a factory block using the
And then we can use them in our specs. And traits can override any attribute defined in the factory
#CU6U0R822 #rspec
They help avoid duplication and let us customise factories based on different test scenarios.
We can define a trait inside a factory block using the
trait
keyword
FactoryBot.define do
factory :user do
name { "John Doe" }
trait :admin do
role { "admin" }
end
trait :with_profile_picture do
after(:build) do |user|
user.profile_picture.attach(
io: File.open(Rails.root.join('spec/fixtures/files/test.jpg')),
filename: 'test.jpg',
content_type: 'image/jpeg'
)
end
end
end
end
And then we can use them in our specs. And traits can override any attribute defined in the factory
create(:user, :with_profile_picture)
create(:user, :admin, :with_profile_picture)
#CU6U0R822 #rspec
Syed Sibtain
System Analyst
Apr 2, 2025
define_singleton_method
dynamically adds a method to a single object instance without modifying the class itself. This is useful when you need custom behaviour for an individual object at runtime.It only modifies the behaviour of a single object in memory at runtime. It does not persist any changes to the database or schema.
user = User.new(name: "Sibtain")
user.define_singleton_method(:greet) do
"Hello, my name is #{name}!"
end
puts user.greet # => "Hello, my name is Sibtain"
#CU6U0R822
Syed Sibtain
System Analyst
Apr 2, 2025
PostgreSQL's
🔹 Why Use
• Stores structured data in a single column.
• Faster queries (no reparsing needed).
• Supports indexing for quick lookups.
• Flexible schema—great for dynamic data.
• Allows key-value updates without rewriting the whole object.
• Removes duplicate keys automatically.
jsonb gives you NoSQL flexibility with SQL power! 🚀
#postgres
jsonb
type stores structured JSON data efficiently. Unlike json, it's binary-optimized, supports indexing, and queries faster.🔹 Why Use
jsonb
?• Stores structured data in a single column.
• Faster queries (no reparsing needed).
• Supports indexing for quick lookups.
• Flexible schema—great for dynamic data.
• Allows key-value updates without rewriting the whole object.
• Removes duplicate keys automatically.
jsonb gives you NoSQL flexibility with SQL power! 🚀
#postgres
Nived Hari
System Analyst
Apr 1, 2025
Aliasing in Ruby
Aliasing in Ruby helps to eliminate code repetition by providing an alternative name for an existing method, allowing it to be called in different ways without duplicating the logic.
For example,
#ruby #aliasing
Aliasing in Ruby helps to eliminate code repetition by providing an alternative name for an existing method, allowing it to be called in different ways without duplicating the logic.
For example,
module QuestionsHelper
def can_modify_question?(question)
!question.survey.has_answers?
end
alias_method :can_edit_question?, :can_modify_question?
alias_method :can_delete_question?, :can_modify_question?
end
#ruby #aliasing
Puneeth kumar
System Analyst
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