Storing Collateral in smart contract for Coin and FA

[ajaythxkur]

I am keeping collateral in object.
Creating store using constructor_ref,
transferring collateral to store
But this shows the collateral coins in wallet and explorer too
Image

code:
` let fa = primary_fungible_store::withdraw(giver, fa_metadata, amount);

let fa_store = fungible_asset::create_store(constructor_ref, fa_metadata);

fungible_asset::deposit(fa_store, fa);`

[kshitjee]

I probably need more context here -- do you have a deployment link so I can see the code?

Also, could you pls be clearer on the issue you're facing? From what I can tell you're trying to store user collateral (APT) in a secondary store, and that is being reflected in your Petra balance? AFAIK Petra only displays balances in primary stores.

[kshitjee]

so code object owns "creation/signer" object

creation object uses signer and owns secondary store object

this is safe since there's no private key involved, and only the extend_ref can be used to withdraw funds from a collateral vault

[ajaythxkur]

thanks @kshitjee this makes more sense, i'll update the code.
one more thing, is it possible to do it with coin. i'll use both coins and fa as collateral. but i have one question in mind, when running repay function, how can i check the correct type of coin being returned?

[ajaythxkur]

and how can multiple coins be stored in contract?

[kshitjee]

to support coin and fa you have two options:

(1) create a coin to fungible asset wrapper, here's an example

(2) create separate entry functions for coin and fa, here's a rewards contract that stores both fungible assets and coins to later distribute as airdrops.

although, ^this doesn't store both coin and fa inside an object, it stores them in the admin account, similar to what you're doing. but that made sense for the requirement.

also, here's aave v3 implemented in move for reference :)

[kshitjee]

oh option (3) is to burn coin and mint fa, but i'd be careful to do this on mainnet, since it's probably smarter to wait for the ecosystem to completely migrate to fungible asset first.