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Contents
module Para
module Orderable
extend ActiveSupport::Concern
included do
scope :ordered, -> { order("#{ table_name }.position ASC") }
before_create :orderable_assign_position
after_commit :reprocess_ordering, on: :create
after_destroy :reprocess_ordering
end
private
def orderable_assign_position
return if attribute_present?(:position)
last_resource = orderable_scope
.where.not(position: nil)
.select(:position)
.first
self.position = if last_resource && last_resource.position
last_resource.position + 1
else
0
end
end
# Unfragment existing resources positions
#
def reprocess_ordering
orderable_scope.each_with_index do |resource, index|
resource.update_column(:position, index)
end
end
def orderable_scope
if (parent = _orderable_options[:parent]) && (as = _orderable_options[:as])
try(parent).try(as).try(:ordered) || self.class.none
else
self.class.unscoped.ordered
end
end
end
module ActiveRecordOrderableMixin
extend ActiveSupport::Concern
included do
class_attribute :orderable, :_orderable_options
end
module ClassMethods
def acts_as_orderable(options = {})
return if orderable?
unless (
( options[:parent] && options[:as]) ||
(!options[:parent] && !options[:as])
)
raise "You need to either pass :parent and :as options to the " \
"acts_as_orderable macro, or no options at all."
end
self.orderable = true
self._orderable_options = options
include Para::Orderable
end
def orderable?
!!orderable
end
end
end
end
Version data entries
32 entries across 32 versions & 1 rubygems