Module: LaserLemon::VestalVersions::ClassMethods

Defined in:
lib/vestal_versions.rb

Instance Method Summary collapse

Instance Method Details

#versioned(options = {}) ⇒ Object



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# File 'lib/vestal_versions.rb', line 10

def versioned(options = {})
  class_inheritable_accessor :versioned_columns
  self.versioned_columns = case
    when options[:only] then column_names & Array(options[:only]).map(&:to_s)
    when options[:except] then column_names - Array(options[:except]).map(&:to_s)
    else column_names
  end

  has_many :versions, :as => :versioned, :order => 'versions.number ASC', :dependent => :delete_all do
    def between(from, to)
      from_number, to_number = number_at(from), number_at(to)
      return [] if from_number.nil? || to_number.nil?
      condition = (from_number == to_number) ? to_number : Range.new(*[from_number, to_number].sort)
      all(
        :conditions => {:number => condition},
        :order => "versions.number #{(from_number > to_number) ? 'DESC' : 'ASC'}"
      )
    end

    def at(value)
      case value
        when Version then value
        when Numeric then find_by_number(value.floor)
        when Symbol then respond_to?(value) ? send(value) : nil
        when Date, Time then last(:conditions => ['versions.created_at <= ?', value.to_time])
      end
    end

    def number_at(value)
      case value
        when Version then value.number
        when Numeric then value.floor
        when Symbol, Date, Time then at(value).try(:number)
      end
    end
  end

  after_create :create_initial_version
  after_update :create_initial_version, :if => :needs_initial_version?
  after_update :create_version, :if => :needs_version?

  include InstanceMethods
  alias_method_chain :reload, :versions
end