What are the arguments for api.query.childBounties.childBounties

Question

In the documentation api.query.childBounties.childBounties takes two u32 arguments:

But it is not clear what are those arguments. Can someone tell me how to map polkadot js api to substrate rust code so these lookups can be checked.

Answer 1

Here is the Rust source for the double map.

It is a link from the parent id to the child id.