Adds :destroy_if option to accepts_nested_attributes_for, which is basically a stronger version of :reject_if that destroys existing records, too.

Provides `ActiveRecord::Relation#one!`, a convenience method that asserts a relation contains exactly one record and returns it. If there are no records or more than one, an `ActiveRecord::NoRecordFound` or `ActiveRecord::MultipleRecordsFound` exception is raised, respectively.

Order your ActiveRecord scopes by a supplied list of ids

ActiveRecord::Relation#outer_joins

An ActiveRecord ConnectionPools class supports switching connection pool by database config instead of ActiveRecord model class name

This patch provides first_or_create method to be atomic, once the default one isn't!!!

activerecord with pattern match

A Rubygem that provides an easy way to build ActiveRecord models that represent PeopleSoft tables

This gem provides the functionality of ActiveRecord::Relation#pick for Rails 5 and 4.2 apps.

This gem provides an extension to ActiveRecord, enabling efficient Multi-Table, Multiple-Inheritance for ActiveRecord models.

active_record-pool is an extension to active_record that gives you an interface to write high-speed inserts, updates, & delete in a manageable way.

Associations for plain old ruby objects

You can use for STI, polymorphic and custom preload

PreloadQuery allows you preload queries and have them available as would a relations and `preload` of ActiveRecord.

See where each database call is coming from in your code, and get query profiling to see which queries are taking up the most time in the database.

Store model settings and properties in JSONB columns with a clean DSL, type casting, default values, and validations. A modern alternative to separate settings tables.

Use the propertybase_id as the primary key in all your rails models

The DSL provides a nice and clean way to write ActiveRecord queries better than model scopes.

Display an overview of the quantity of queries being made and their origins in a block of code in Rails applications.

Detects N+1 queries in Rails applications and provides actionable suggestions to fix them