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Rails: How do I validate uniqueness of certain types in an enum

Turn off logging base64 encoded attachment in rails

Is 10.minutes.ago using Time.now or Time.current?

How to track time spent on Web Site [closed]

RoutingError raised when using precompiled assets in production environment

Rails Associations Riddle: User, Lecturer, Student and Event

After pushing RoR project to server, receive Node.js version error [Buildpack issue]

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ActiveRecord query with multiple joins not recognizing the relations

Rails: returning a controller object to AJAX caller

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Rails command Error

Why is this RSpec test failing?

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Time-based actions in browser game on Rails

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How to make these two simultaneous transactions succeed at all times, without causing a uniqueness violation?

Very low speed in executing Rails commands

Rails 3. How to create more than one new resource in one page?

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In Ruby, can I pass each element of an array individually to a method that accepts *args?

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How to use the 'where' method from 'ActiveRecord::QueryMethods' in order to limit searching?

why do I get the error when installing the gem 'pg'? [duplicate]