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Rails 3 ActiveRecord validation based on user permissions

Rails / ActiveRecord: detect if a column is an association or not

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Rails 4.1 Enums: enum.status = nil

How to query a model based on attribute of another model which belongs to the first model?

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Force to reconnect MySQL in Rails

Rails AR validates_uniqueness_of against polymorphic relationship

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Rails 4: Export database to YAML

Accepts Nested Attribute with a virtual attribute

ActiveRecord connection warning. (Database connections will not be closed automatically)

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Ruby on Rails order by id (and version?)