Class: Cranium::Transformation::Sequence

Inherits:
Object
  • Object
show all
Defined in:
lib/cranium/transformation/sequence.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ Sequence

Returns a new instance of Sequence.



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# File 'lib/cranium/transformation/sequence.rb', line 7

def initialize(name)
  @name = name
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/cranium/transformation/sequence.rb', line 3

def name
  @name
end

Class Method Details

.by_name(name) ⇒ Object 



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# File 'lib/cranium/transformation/sequence.rb', line 31

def by_name(name)
  @sequences ||= {}
  if @sequences[name].nil?
    @sequences[name] = new name
    Cranium.application.after_import { @sequences[name].flush }
  end
  @sequences[name]
end

Instance Method Details

#flush ⇒ Object 



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# File 'lib/cranium/transformation/sequence.rb', line 23

def flush
  Cranium::Database.connection.run "SELECT setval('#{@name}', #{@current_value})" unless @current_value.nil?
end

#next_value ⇒ Object 



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# File 'lib/cranium/transformation/sequence.rb', line 13

def next_value
  if @current_value.nil?
    @current_value = Cranium::Database.connection["SELECT nextval('#{@name}') AS next_value"].first[:next_value]
  else
    @current_value += 1
  end
end