Useful Tips for Ruby on Rails Beginner


This article describes some useful tips for Ruby on Rails.

🍮 Time

ISO8601 with micro second

To get the current time with ISO 8601 format with microseconds is as follows:

Time.current.iso8601(6)
=> "2016-07-01T13:03:00.193967+09:00"

🍣 Concern

  • Define scope in include block
  • Module definition class method in block of ClassMethods
  • Instance method is directly below module
module MyConcern
  extend ActiveSupport::Concern

  included do
    scope :without_deleted, lambda{ where(deleted_at: nil) }
  end

  module ClassMethods
    def foo
      puts 'foo'
    end
  end

  def bar
    puts 'bar'
  end
end

[Troubleshooting] Undefined method model_name for Project:Class

module MyConcern
  extend ActiveModel::Naming
  # ...
end

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