You might find this helpful: https://stackoverflow.com/a/54200430/440323

Note, using the deletable argument in this case could be a bit inefficient 
because it will need to do a database select for each row in the grid to 
determine if there are any children. I suppose you could instead do a 
single join query before creating the grid to fetch the same set of records 
along with a count of any children and then just do a lookup in that local 
Rows object from the deletable function.

Anthony

On Sunday, January 27, 2019 at 12:55:04 PM UTC-5, Carlos Cesar Caballero 
wrote:
>
> Hi, is possible to don't allow deleting specific records in the grid? 
>
> Basically, I have a one to many relation "parent has childs", but it is 
> in cascade mode and I can't change it, so, I need to forbid deleting of 
> parent records who has childs. 
>
>
> Greetings. 
>
>
>

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