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.

Generated scopes for ActiveRecord classes.

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.

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.

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

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

Quick named scopes to make your life a little easier

Build up named scopes conditionally.

Trailblazer Finder Objects

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.