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Versions: 15
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Contents
# frozen_string_literal: true
module ROM
module SQL
module Plugin
# Nullify relation by
#
# @api public
module Nullify
if defined? JRUBY_VERSION
# Returns a relation that will never issue a query to the database. It
# implements the null object pattern for relations.
# Dataset#nullify doesn't work on JRuby, hence we fall back to SQL
#
# @api public
def nullify
where { `1 = 0` }
end
else
# Returns a relation that will never issue a query to the database. It
# implements the null object pattern for relations.
#
# @see http://sequel.jeremyevans.net/rdoc-plugins/files/lib/sequel/extensions/null_dataset_rb.html
# @example result will always be empty, regardless if records exists
# users.where(name: 'Alice').nullify
#
# @return [SQL::Relation]
#
# @api public
def nullify
new(dataset.where { `1 = 0` }.__send__(__method__))
end
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems