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# frozen_string_literal: true
# Copyright (c) 2016 Andy Pike - The MIT license
#
# This file has been copied from https://github.com/andypike/rectify/blob/master/lib/rectify/query.rb
# We have done this so we can decouple Decidim from any Virtus dependency, which is a dead project
# Please follow Decidim discussion to understand more https://github.com/decidim/decidim/discussions/7234
module Decidim
class UnableToComposeQueriesException < StandardError
def initialize(query, other)
super(
"Unable to composite queries #{query.class.name} and " \
"#{other.class.name}. You cannot compose queries where #query " \
"returns an ActiveRecord::Relation in one and an array in the other."
)
end
end
class Query
include Enumerable
def self.merge(*queries)
queries.reduce(Decidim::Query.new([])) { |a, e| a.merge(e) }
end
def initialize(scope = ActiveRecord::NullRelation)
@scope = scope
end
def query
@scope
end
def |(other)
return other if @scope.is_a?(Array) && @scope == []
if relation? && other.relation?
Decidim::Query.new(cached_query.merge(other.cached_query))
elsif eager? && other.eager?
Decidim::Query.new(cached_query | other.cached_query)
else
raise Decidim::UnableToComposeQueriesException.new(self, other)
end
end
alias merge |
delegate :count, to: :cached_query
alias size count
delegate :first, to: :cached_query
def each(&block)
cached_query.each(&block)
end
def exists?
return cached_query.exists? if relation?
cached_query.present?
end
def none?
!exists?
end
delegate :to_a, to: :cached_query
alias to_ary to_a
def relation?
cached_query.is_a?(ActiveRecord::Relation)
end
def eager?
cached_query.is_a?(Array)
end
def cached_query
@cached_query ||= query
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems