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Contents
module Workarea
# TODO extract to gem
module Ordering
extend ActiveSupport::Concern
included do
field :position, type: Integer
after_validation :set_position
after_create :move_lower_blocks_down
after_destroy :move_lower_blocks_up
default_scope -> { asc(:position) }
end
def lower_siblings
siblings.where(:position.gte => position).excludes(id: id)
end
def higher_siblings
siblings.where(:position.lte => position).excludes(id: id)
end
private
def siblings
return self.class.all unless embedded?
return self.class.none unless _parent.present?
_parent.send(relation_metadata.name).criteria
end
def set_position
if position.blank?
self.position = siblings.exists(position: true).length
end
end
def move_lower_blocks_down
lower_siblings.select(&:persisted?).each { |b| b.inc(position: 1) }
end
def move_lower_blocks_up
lower_siblings.select(&:persisted?).each { |b| b.inc(position: -1) }
end
end
end
Version data entries
62 entries across 62 versions & 1 rubygems