This piece of code current errors `var blocks by Block referrersOn Blocks.articleId`

# exposed

[JohnV]

This piece of code current errors var blocks by Block referrersOn Blocks.articleId

[tapac]

What kind of an error?

[JohnV]

Hi Andrey, this is the error

[tapac]

I see, it's because you use var instead of val.
At the moment it's impossible to set collection to refererrs field. You have to update articleId field of Block class instead.

[tapac]

The main problem is that when you "write" a collection you have to clean reference from entities which already linked to parent entity. And if it's not optional field than the whole code will fail.

E.g. Article.A has two block Block.A and Block.B, then you're 'trying to set Block.B and Block.C to blocks field of Article.A. What should happen with Block.A?

[JohnV]

Ah I understand, thanks 👍