[xurshudyan]

findOrNew() on HasManyThrough / HasOneThrough, and chunkMap() on those and on BelongsToMany, are not defined on the relation, so they get forwarded to the Eloquent builder and run as select * over the join. Columns from the intermediate or pivot table then overwrite the related model's columns.

For example:

$post = $country->posts()->findOrNew(7);

$post->id; // 2, the user's id instead of the post's
$post->title = 'Updated';
$post->save(); // updates post 2, not post 7

On BelongsToMany, chunkMap() returns models without pivot, and if the pivot table has an id column the models get the pivot row's id.

This adds findOrNew() and chunkMap() to HasOneOrManyThrough, and chunkMap() to BelongsToMany, going through the relation's own find() and chunk() the same way each() and chunk() already do (#22127).

[shaedrich]

Passing a negative number to $count may result in

Illuminate\Database\QueryException
SQLSTATE[HY000]: General error: 1 near "offset": syntax error (SQL: select * from "users" order by "users"."id" asc offset 0)

so it might be good to type this as

Suggested change

	* @param int $count
	* @param non-negative-int $count