How to use concerns in Rails 4

How to use concerns in Rails 4

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Rails 4: List of available datatypes

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Rails update_attributes without save?

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Rails I18n validation deprecation warning

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Rails 4: before_filter vs. before_action

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Add a reference column migration in Rails 4

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PG::ConnectionBad - could not connect to server: Connection refused

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How is attr_accessible used in Rails 4?

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Auto-loading lib files in Rails 4

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Paperclip::Errors::MissingRequiredValidatorError with Rails 4

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Rails: How to reference images in CSS within Rails 4

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Rails 4 Authenticity Token

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Determine what attributes were changed in Rails after_save callback?

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How to solve error "Missing `secret_key_base` for 'production' environment" (Rails 4.1)

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Rails: validate uniqueness of two columns (together)

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