ActiveRecord "link" requires additional "save" when linked "viaTable" otherwise "Unable to link models: both models must NOT be newly created" error

[yiisoft]

ActiveRecord "link" requires additional "save" when linked "viaTable" otherwise "Unable to link models: both models must NOT be newly created" error

[dynasource]

:), if this was an algorithm, all the issues would have been closed at once

[cebe]

How do you expect the entry in the relation table to be created when the model has no primaryKey value assigned?

[e-frank]

sure you are right. i wished i found some automagic here and expected a 'linked save' to save the complete model-tree. [or the same behaviour with and without ->viaTable. with viaTable the child model is saved, without isn't.]

when you use ->link a second time, you will get an additional row in the relation table, and no error, if you don't have an unique index.
i didn't find anything like a isLinked method, so what i think i have to do is test the parent relationship for an existing child by the child's primary key, like:

$hasChild = $parent->getRelation($relation)->andWhere('id=1')->exists();

and then decide if you need ->link.
i am working on a hydrator and hope to publish it asap.
still: fantastic work!

[dynasource]

closed in favor of https://github.com/yiisoft/yii2/issues/4834

[cebe]

@dynasource this issue is #4834 :)

[samdark]

yiisoft/yii2#15882