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# frozen_string_literal: true
require "mongoid/contextual/aggregable"
module Mongoid
module Contextual
module Aggregable
# Contains behavior for aggregating values in null context.
module None
# Get all the aggregate values for the provided field in null context.
# Provided for interface consistency with Aggregable::Mongo.
#
# @param [ String | Symbol ] _field The field name.
#
# @return [ Hash ] A Hash with count, sum of 0 and max, min, avg of nil.
def aggregates(_field)
Aggregable::EMPTY_RESULT.dup
end
# Always returns zero.
#
# @example Get the sum of null context.
#
# @param [ Symbol ] _field The field to sum.
#
# @return [ Integer ] Always zero.
def sum(_field = nil)
0
end
# Always returns nil.
#
# @example Get the avg of null context.
#
# @param [ Symbol ] _field The field to avg.
#
# @return [ nil ] Always nil.
def avg(_field)
nil
end
# Always returns nil.
#
# @example Get the min of null context.
#
# @param [ Symbol ] _field The field to min.
#
# @return [ nil ] Always nil.
def min(_field = nil)
nil
end
# Always returns nil.
#
# @example Get the max of null context.
#
# @param [ Symbol ] _field The field to max.
#
# @return [ nil ] Always nil.
alias :max :min
end
end
end
end
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20 entries across 20 versions & 1 rubygems