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# exposed
j

JohnV

04/28/2019, 8:00 PM
This piece of code current errors 
var blocks by Block referrersOn Blocks.articleId
t

tapac

04/29/2019, 10:13 AM
What kind of an error?
j

JohnV

04/30/2019, 10:20 AM
Hi Andrey, this is the error
t

tapac

04/30/2019, 11:24 AM
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.
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?
j

JohnV

04/30/2019, 11:40 AM
Ah I understand, thanks 👍
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