Benito Serna Tips and tools for Ruby on Rails developers

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Simple Searchable module for searching with Rails and SQLite's LIKE February 9, 2024
A "read-more" behavior truncating by number of lines with css line-clamp and Stimulus.js April 3, 2021, updated on January 24, 2024
Copy shoes.rb and use stacks and flows to build layouts January 24, 2024
Fix n+1 queries by caching computed values July 19, 2023
Tools to help you detect n+1 queries March 1, 2021, updated on July 12, 2023
Truncate in the middle with truncate rails helper June 19, 2023
A form with two buttons with formation and formmethod June 8, 2023
What to do when you need a button_to within a form in Rails June 5, 2023
Simple image manager with active storage May 22, 2023
Add many attachments without deleting previous ones using ActiveStorage May 16, 2023
Use after_touch to avoid to handle race conditions saving computed values March 2, 2023
Use with_lock to handle race conditions saving computed values March 1, 2023
Pick a safe previous date to avoid race conditions saving computed values February 14, 2023
Touch + fragment caching to avoid race conditions saving computed values January 31, 2023
Will it save the wrong value? January 3, 2023
Saving incorrect computed values thanks to race conditions December 22, 2022
Examples to explore possible race conditions when caching custom computed values in Rails December 7, 2022
Broadcast multiple actions with broadcast_render September 19, 2022
Building a dynamic data grid with search and filters using rails, hotwire and ransack September 3, 2022
Fetching the top n per group with window functions August 22, 2022
Fetching the top n per group with a lateral join with rails August 16, 2022
Active Record Playground Runner Introduction August 8, 2022
Mistakes we make with counts in rails June 6, 2022
A tool and examples to help you implement the first or last per record in rails with one query May 31, 2022
Solve n+1 queries and slow counts with counter caches May 19, 2022
4 things you can try before using a counter cache in rails May 16, 2022
When do you need a counter cache in rails? May 9, 2022
Use dom_id helper on capybara with rspec and rails May 2, 2022
How to preload counts in a list with ActiveRecord April 25, 2022
Difference between count, length and size in an association with ActiveRecord April 18, 2022
Active record playground, for rails developers that want an easy way to practice with active record in isolation March 29, 2022
Specific preloading with scoped associations March 16, 2022
How to use react with hotwire? February 28, 2022
Should you split your rails app into backend and frontend? February 14, 2022
How the turbo_frame_tag helper transforms an object to an html id? February 8, 2022
Styler and tachyons examples January 28, 2022
Inline CRUD with rails and hotwire January 11, 2022
Remote modals with rails, hotwire and bootstrap January 4, 2022
Using a form object to create more than one record October 14, 2020, updated on December 21, 2021
Dynamic filters with rails and hotwire December 14, 2021
Styler, a tool to compose css classes with ruby December 7, 2021
Capybara cheatsheet as pdf November 29, 2021
Preloading associations cheatsheet November 19, 2021
How to detect n+1 queries by watching the logs November 16, 2021
How can I determine if my n+1 queries fix can hurt the performance? November 2, 2021
Joins does not preload October 24, 2021
Example app to understand why some times fixing some n+1 queries can hurt performance October 12, 2021
Why some people say that fixing some n+1 queries could hurt performance? October 8, 2021
Preload object on the guide for preloading associations September 13, 2021
Using an objet to represent a complex preload August 23, 2021
A guide for preloading associations in rails August 9, 2021
What is an n+1 queries problem? July 27, 2021
Tool to run the examples for the 5 ways to fetch the latest-n-of-each record July 22, 2021
How to test that an email was sent on a unit/micro test July 12, 2021
How to test that an email was sent on a system spec July 2, 2021
Guide to name scopes based on column types June 29, 2021
List of alternatives to heroku June 22, 2021
Guide to justify the heroku's price to your boss or clients June 14, 2021
List of questions to check if heroku is really expensive for your project June 8, 2021
Extracting domain knowledge from a query method May 27, 2021
Building a DateTime range to query for the records created a "week before" May 6, 2021
How to read the noCertificado from a CSD for a mexican CFDI May 5, 2021
How to test a PDF download with capybara May 3, 2021
A simple way of testing a CSV download with capybara April 20, 2021
A "read-more" behavior truncating with rails truncate helper and Stimulus.js April 19, 2021
A "read-more" behavior truncating by number of lines with custom javascript and Stimulus.js April 2, 2021
Capybara cheatsheet March 24, 2021
Custom capybara matchers with compound expectations March 17, 2021
Quiz to practice the difference between preload, includes or eager_load February 22, 2021
Which specs would you prefer for this presentation object? February 17, 2021
Code to run the examples for preload, includes or eager_load February 16, 2021
Examples to learn the difference between preload, includes or eager_load February 4, 2021
How to attach an active storage file to an email January 27, 2021
When is better to use preload or eager_load vs includes? January 19, 2021
What is the difference between includes, preload, eager_load and joins in ActiveRecord? January 7, 2021
5 ways to fetch the latest-N-of-each record on Rails December 23, 2020
10 Examples to learn when your ActiveRecord query will be executed December 8, 2020
Why Active Record seems to ignore your "includes" and runs a query for each record? November 20, 2020
PDF with the benchmarks for the fixes to the latest-comment n+1 problem November 19, 2020
Tool to run the benchmark for fixes for the latest-comment n+1 queries problem November 14, 2020
Cheatsheet to help you decide which fix for the last-comment n+1 problem is the best for you November 13, 2020
Tool to run the fixes for the latest-comment n+1 queries problem November 10, 2020
Benchmarks for the fixes to the latest-comment n+1 problem November 2, 2020
5 ways to fix the latest-comment n+1 problem October 20, 2020
Create a new controller for the hidden abstraction and reduce conditionals October 6, 2020
Association with default order, to fix the latest-comment n+1 problem September 30, 2020

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Here I try to share knowledge and fixes to common problems and struggles for ruby on rails developers, like How to fetch the latest-N-of-each record or How to test that an specific mail was sent or a Capybara cheatsheet. You can see more examples on Most recent posts or all posts.