Add Ability to Bulk Delete Based on Results of a Query

[willcj33]

I think it would be useful to have the ability to run a query like so:
{deleteItems as var(func: eq(property, someval)){} delete(id: var(deleteItems)) }
That may be poor syntax, but just having the ability to query and delete based on that query would be great.

[manishrjain]

This depends upon #919.

[manishrjain]

@ashwin95r Can you confirm that this would work now? Test it out before marking this issue as resolved.

[ashwin95r]

Yes, It doesn't work now. I'm looking into it.

[zboralski]

is it possible to make a query ... for example get all nodes with predicate x, filter nodes that don't have predicate y... delete all resulting nodes?

[pawanrawal]

This is possible in a two-step process.

1. Make a query as part of a transaction to get the uids of all filtered nodes.
2. Issue another mutation as part of the same transaction to delete them.