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New posts in activemodel

Shared scopes via module?

Track dirty for not-persisted attribute in an ActiveRecord object in rails

How to implement multiple different serializers for same model using ActiveModel::Serializers?

Forbidden Attributes Error in Rails 4 when encountering a situation where one would have used attr_accessible in earlier versions of Rails

How to test a custom validator?

get validations from model

Controlling the order of rails validations

ActiveModel::MissingAttributeError occurs after deploying and then goes away after a while

LoadError Unable to autoload constant Message

Difference between Active Model, Active Record and Active Resource

Getting types of the attributes in an ActiveRecord object

How to determine if a record is just created or updated in after_save