Active Record - Giant Robots Smashing Into Other Giant Robots

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How fast can an ActiveRecord SQL query run?

You have a SQL query that seems like it needs to be faster. What’s the upper-bound on improving that query’s performance?
Fritz Meissner
March 31, 2025
ActiveRecord query log tags for GraphQL

ActiveRecord query log tags is my pick for most underrated Rails config option that isn’t enabled by default. Here’s how to extend it beyond the default options, with a specific example of GraphQL.
Fritz Meissner
March 18, 2025
Finding the opposite of what you have with rails invert_where

Need to fetch the opposite data for an existing ActiveRecord query? Rails invert_where makes it effortless, but be careful with the side effects.
Trésor Bireke
March 14, 2025
- Active Record
- Ruby
- Rails
- Development
This week in #dev (Aug 9, 2024)

Renaming keys in a Hash, sanitizing input for a LIKE query, and toggling attributes in Rails.
thoughtbot
August 20, 2024
Enum validations and database constraints in Rails 7.1

How to add model validation for a column using a PostgreSQL enum type in Rails 7.1.
Sally Hall
April 16, 2024
- Web
- Rails
- Active Record
- Databases
- Validation
- Enum
Are your polymorphic relationships correctly enforced?

Learn how to strike a balance between flexibility and data integrity with a partial index and validations.
Steve Polito
December 1, 2023
- Web
- Rails
- PostgreSQL
- Active Record
What's a counter cache?

Running a separate query to count how many records are associated with another record is inefficient. Using a counter cache can save the day!
Jose Blanco
November 21, 2023
- Rails
- Ruby
- Web
- Active Record
- Good Code
Building Value Objects in Rails with composed_of

Learn how to improve the interface of your existing Active Record Models with this underutilized API.
Steve Polito
July 20, 2023
- Rails
- Ruby
- Web
- Active Record
- Good Code
Are you absolutely sure your `has_one` association really has one association?

Learn about an unexpected limitation with this API and how to combat it universally.
Steve Polito
June 5, 2023
This week in #dev (Mar 24, 2023)

It’s all about databases in this edition!
thoughtbot
April 7, 2023
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