first_or_create does not guarantee uniqueness by itself, and if there is a uniqueness constraint on the database, it may fail with a RecordNotUnique exception. This gem adds atomic_first_or_create, which, in conjunction with a uniqueness constraint, provides the correct behaviour.

Atomic update of JSON/JSONB fields for ActiveRecord models

Pub sub and websockets

Attach documents & files to Active Record models

Adds has_attachment (file store) properties to ActiveRecord. Supports local file, file-in-db, S3 and Cloudfiles backends.

A high performance ActiveRecord concern for Rails using the PostgreSQL array type.

Provides functionality to transparently store and retrieve encrypted attributes in ActiveRecord models.

Allows you to define CSV-style attributes for your ActiveRecord models

Generates attr_accessors that encrypt and decrypt attributes transparently

A method for restricting an attribute to a set of choices

Allow attribute-level read/write access control, per instance, of any ActiveModel class.

Allows step change for attributes.

Add default attribute values when creating models.

AttributeDelegator provides a class method to ActiveRecord models that dynamically generates getter/setter to treat the attributes of a has_one model like native attributes. This is particularly useful because it allows the delegated attributes to be assigned via model.attributes= {}, such as by a form submission.

A model attribute enums plugin for Rails3. like 'symbolize' gem.

Builds macros to automatically manipulate your models' attributes.

Concise way of filtering model attributes in Rails.

Date-granular history for specified model fields. Compact & easy to query.

ActiveRecord/ActiveModel validation extension which enables attributes validation.

Attribute inheritance for ActiveRecord models