Ransack is the successor to the MetaSearch gem. It improves and expands upon MetaSearch's functionality, but does not have a 100%-compatible API.

Searchlogic makes using ActiveRecord named scopes easier and less repetitive.

Filterrific is a Rails Engine plugin that makes it easy to filter, search, and sort your ActiveRecord lists.

Use deep_pluck as a shortcut to select one or more attributes and include associated models without loading a bunch of records. And DRY up your code when using #as_json.

Generated scopes for ActiveRecord classes.

Adds various #where_assoc_* methods to ActiveRecord to make it easy to do correct conditions on the associations of the model being queried.

Adds the ability to pull random records from ActiveRecord

Build common named scopes automatically, and provide a simple way to merge them with a single #search call.

A collection of utilitarian named scopes providing common functionality for ActiveRecord models.

Small DSL to create ActiveRecord (>= 3.1) attribute predicates without writing SQL.

Quick named scopes to make your life a little easier

Create ActiveRecord relations from UNIONs

Trailblazer Finder Objects

Build up named scopes conditionally.

Simple filtering for ActiveRecord, Sequel and enumerables.

Returns a random record for Ruby Models using ActiveRecord

Scopable allows you to create objects that produce complex queries based on incoming parameters hash which are testable and easy to understand.