Awesome nested set - An awesome nested set implementation for Active Record. SexyScopes - Small DSL to create ActiveRecord (>= 3.1) attribute predicates without writing SQL. Utility scopes - A collection of utilitarian named scopes providing common functionality for ActiveRecord models. Can search - Build common named scopes automatically, and provide a simple way to merge them with a single #search call. randumb - Adds the ability to pull random records from ActiveRecord. filterrific - Filterrific is a Rails Engine plugin that makes it easy to filter, search, and sort your ActiveRecord lists. Pacecar - Generated scopes for ActiveRecord classes. Searchlogic - Searchlogic makes using ActiveRecord named scopes easier and less repetitive. It improves and expands upon MetaSearch's functionality, but does not have a 100%-compatible API. 
ransack - Ransack is the successor to the MetaSearch gem.Ambitious query indexer - Pain-free indexing to speed up your Rails app.
#Pdfkit vs princexml generator
immigrant - Adds a generator for creating a foreign key migration based on your current model associations.lol_dba - lol_dba is a small package of rake tasks that scan your application models and displays a list of columns that probably should be indexed.schema_plus - SchemaPlus is a gem that simply pulls in a collection of other gems from the SchemaPlus family of ActiveRecord extensions.does not assume that all foreign keys end with the convention of _id. Rails indexes - A rake task to track down missing database indexes.foreigner - Adds helpers to migrations and dumps foreign keys to schema.rb.enum_column3 - Enable enum type for MySQL db.Active Enum - Define enum classes in Rails and use them to enumerate ActiveRecord attributes.Enumerate it - Enumerations for Ruby with some magic powers!.Classy Enum - A utility that adds class based enum functionality to ActiveRecord attributes.Enumerated attribute - Enumerated model attributes and view helpers.Simple enum - Provides enum-like fields for ActiveRecord, ActiveModel and Mongoid models.enumerize - Enumerated attributes with I18n and ActiveRecord/Mongoid/MongoMapper support.Default value for - The default_value_for plugin allows one to define default values for ActiveRecord models in a declarative manner.Using NullDB enables you to test your model business logic - including after_save hooks - without ever touching a real database.
nulldb - A database backend that translates database interactions into no-ops. This adapter is superset of original ActiveRecord Oracle adapter. oracle-enhanced - Oracle "enhanced" ActiveRecord adapter contains useful additional methods for working with new and legacy Oracle databases. activerecord-jdbcderby-adapter - Derby JDBC adapter for JRuby on Rails. activerecord-jdbcpostgresql-adapter - Postgres JDBC adapter for JRuby on Rails. activerecord-jdbcmysql-adapter - MySQL JDBC adapter for JRuby on Rails. It allows to connect to virtually any JDBC-compliant database with your JRuby on Rails application. Provides (ActiveRecord) built-in adapters: MySQL, PostgreSQL and SQLite3 as well as adapters for popular databases such as Oracle, SQLServer, DB2, FireBird and even Java (embed) databases: Derby, HSQLDB and H2. activerecord-jdbc-adapter - AR-JDBC is a database adapter for Rails' ActiveRecord component designed to be used with JRuby built upon Java's JDBC API for database access. 
activerecord-sqlserver-adapter - ActiveRecord SQL Server Adapter.
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