Discussion on: What are best practices for persisting positions when using drag & drop?

[Guillaume Martigny]

In your code snippet:

• You use position then order, but I guess it's a typo.
• You decrements position of elements being pushed down (when moving up), but shouldn't you increments position of element being pushed up (when moving down) ?

[Guillaume Martigny]

Fixed:

update table -- When moving item down
  set position = position - 1
  where current_position < position and position <= new_position;

update table -- When moving item up
  set position = position + 1
  where new_position < position and position <= current_position

update table
  set position = <new_position>
  where id = <object_id>

Add moving up and remove some useless =. (not tested tho)

[Sten]

Thanks, I fixed the typo and yes there's a second statement to push things up when moving down. This was totally inspired by this StackExchange post.

There are also some other statements to push compact list 1 and push things down in list 2 when moving things from list 1 to list 2.