configuring an associated type of a pallet to a pallet

Question

To what will the Currency associated type of pallet-assets be configured if I configure it to pallet-balances like done in statemint?

Thanks in advance

the whole pallet will become a struct by the macros, thats why when you see Currency=Balances it works — dadzerlaze, Commented Jan 18, 2023 at 15:48
check this for an example: docs.substrate.io/build/pallet-coupling and this to understand the effect of the various macros: docs.substrate.io/reference/frame-macros — dadzerlaze, Commented Jan 18, 2023 at 15:50

bkchr · Accepted Answer · 2023-01-19 08:56:58Z

1

First, Balances being the name that is set for pallet-balances in construct_runtime!. This is a type declaration that looks like:

type Balances = pallet_balances::Pallet<Runtime>;

Or to the entire pallet, how does this work?

So, this is right. Currency is a trait and this trait is implemented for the pallet_balances::Pallet. So, pallet-assets will use pallet-balances as currency implementation through the Currency trait.

answered Jan 19, 2023 at 8:56

bkchr♦

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But how is the Currency associated type of pallet-assets then linked to the Currency trait?
– Daan van der Plas
Commented Jan 19, 2023 at 13:19
github.com/paritytech/substrate/blob/… this requires that Currency implements ReservableCurrency and ReservableCurrency requires that any type that implements this trait also implements Currency: github.com/paritytech/substrate/blob/… ( this is called super trait)
– bkchr ♦
Commented Jan 19, 2023 at 15:55
Amazing! Thanks a lot!
– Daan van der Plas
Commented Jan 19, 2023 at 16:04

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