Validate uniqueness of multiple columns

Validate uniqueness of multiple columns

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Ruby on Rails Callback, what is difference between :before_save and :before_create?

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ruby-on-rails

rails 3 validation on uniqueness on multiple attributes

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ruby-on-rails

How to update attributes without validation

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ruby-on-rails

Rails: What's a good way to validate links (URLs)?

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ruby-on-rails

Rails: how do I validate that something is a boolean?

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ruby-on-rails

Rails - Validate Presence Of Association?

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ruby-on-rails

Rails "validates_uniqueness_of" Case Sensitivity

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ruby-on-rails

Rails: Validating min and max length of a string but allowing it to be blank

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ruby-on-rails

Where should Rails 3 custom validators be stored?

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ruby-on-rails

validation custom message for rails 3

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ruby-on-rails

What's the state of the art in email validation for Rails?

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ruby-on-rails

How do I validate a date in rails?

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ruby-on-rails

accepts_nested_attributes_for child association validation failing

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ruby-on-rails

HTML5 'required' validation in Ruby on Rails forms

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