module ActiveRecord module NullRelation # :nodoc: def pluck(*column_names) [] end def delete_all(_conditions = nil) 0 end def update_all(_updates) 0 end def delete(_id_or_array) 0 end def empty? true end def none? true end def any? false end def one? false end def many? false end def to_sql "" end def calculate(operation, _column_name) case operation when :count, :sum group_values.any? ? Hash.new : 0 when :average, :minimum, :maximum group_values.any? ? Hash.new : nil end end def exists?(_conditions = :none) false end def or(other) other.spawn end private def exec_queries @records = [].freeze end end end