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1503 화면

I have a button on a tree view

The tree view is on model A and model A has a relation with model B

I'd like the button on the tree view on model A to appear only if there are more than 0 related records in B


Model A is based on a hand written query (that creates a view) so I can't store a state field there (or can I ?)

How do I achieve this ?

Thanks

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