Class: ActiveRecord::Summarize::CalculationImplementation::Count

Inherits:
Base
  • Object
show all
Defined in:
lib/activerecord/summarize/calculation_implementation.rb

Instance Attribute Summary

Attributes inherited from Base

#column, #relation

Instance Method Summary collapse

Methods inherited from Base

#initialize, #select_column_arel_node

Constructor Details

This class inherits a constructor from ActiveRecord::Summarize::CalculationImplementation::Base

Instance Method Details

#function_arel_node_class ⇒ Object 



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# File 'lib/activerecord/summarize/calculation_implementation.rb', line 77

def function_arel_node_class
  Arel::Nodes::Count
end

#initial ⇒ Object 



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# File 'lib/activerecord/summarize/calculation_implementation.rb', line 81

def initial
  0
end

#reducer(memo, v) ⇒ Object 



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# File 'lib/activerecord/summarize/calculation_implementation.rb', line 85

def reducer(memo, v)
  memo + (v || 0)
end

#unmatch_arel_node ⇒ Object 



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# File 'lib/activerecord/summarize/calculation_implementation.rb', line 73

def unmatch_arel_node
  nil # In SQL, null is no value and is not counted
end