lib/active_relation/primitives/aggregation.rb


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module ActiveRelation
  class Aggregation
    attr_reader :attribute, :function_sql
    
    def initialize(attribute, function_sql)
      @attribute, @function_sql = attribute, function_sql
    end

    def substitute(new_relation)
      Aggregation.new(attribute.substitute(new_relation), function_sql)
    end
    
    def to_sql(strategy = nil)
      "#{function_sql}(#{attribute.to_sql})"
    end
    
    def ==(other)
      self.class == other.class and attribute == other.attribute and function_sql == other.function_sql
    end
  end
end