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module Boards
module Lists
class MoveService < BaseService
def execute(list)
@board = list.board
@old_position = list.position
@new_position = params[:position]
return false unless list.movable?
return false unless valid_move?
list.with_lock do
reorder_intermediate_lists
update_list_position(list)
end
end
private
attr_reader :board, :old_position, :new_position
def valid_move?
new_position.present? && new_position != old_position &&
new_position >= 0 && new_position < board.lists.movable.size
end
def reorder_intermediate_lists
if old_position < new_position
decrement_intermediate_lists
else
increment_intermediate_lists
end
end
def decrement_intermediate_lists
board.lists.movable.where('position > ?', old_position)
.where('position <= ?', new_position)
.update_all('position = position - 1')
end
def increment_intermediate_lists
board.lists.movable.where('position >= ?', new_position)
.where('position < ?', old_position)
.update_all('position = position + 1')
end
def update_list_position(list)
list.update_attribute(:position, new_position)
end
end
end
end
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