breadcrumb_helper.rb
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	module BreadcrumbHelper
	# Domain
	# Domain / group / example.com
	# Domain / group / example.com / ns1.example.com IN A
	# Domain / group / example.com / new
	def breadcrumbs(leaf)
	stack = []
	crumbs = []
	stack.push leaf if leaf

	while crumb = stack.pop # rubocop:disable Lint/AssignmentInCondition
	case crumb
	when Record
	if crumb.persisted?
	crumbs.push(
	name: "#{crumb.name} IN #{crumb.type}",
	link: domain_record_path(crumb.domain_id, crumb))
	else
	crumbs.push(name: :new)
	end
	stack.push crumb.domain
	when Domain
	if crumb.persisted?
	crumbs.push(name: crumb.name, link: domain_path(crumb))
	else
	crumbs.push(name: :new)
	end
	stack.push crumb.group
	when Group
	crumbs.push(name: crumb.name)
	end
	end

	crumbs.push(name: 'Domains', link: '/')

	crumbs.reverse!
	crumbs.each { \|c\|
	# Last element should not be a link
	if c == crumbs.last \|\| c[:link].nil?
	yield c[:name]
	else
	yield link_to(c[:name], c[:link])
	end
	}
	end

	end