Contract.from_abi not working as expected

[AlbertoSinigaglia]

in the video (at arout 7:22:42) you are using this code to load a contract from an ABI:

Contract.from_abi(contract._name, contract_addres, contract._abi)

however this is not working if we run the integration test (it says that there is no attribute called _abi and _name as we can see from here)... I've solved using this:

contract = Contract.from_abi(contract_type.__class__.__name__, contract_addr, contract_type.abi)
#                                         ^^^^^^^^^^^^^^^^--- don't do this, use ._name as @PatrickAlphaC answered

also, for me 60 seconds to wait wasn't enough... but 4 minutes yes

[PatrickAlphaC]

Hmm.... This "works" but not in the way that we'd expect. Not a big deal... but let's figure out what's going on.

contract_type should be <class 'brownie.network.contract.ContractContainer'>
If you do print(type(contract_type)) right before that line and run the deploy script, what do you get?

contract_type.__class__.__name__ will be ContractContainer
but we want LinkToken, which we get from contract_type._name

Could you check what's going on?

[AlbertoSinigaglia]

ok yes I can confirm that ._name is working fine, thank you so much

[Nlferu]

Hello, I was searching whole brownie documentation for ContractContainer, but I couldn't find attribute _name for it, we did not pre defined it and there is no such argument in any of mock we are deploying. Can anyone explain to me where such argument is located and how we were supposed to know calling contract_type._name will return it's name?

If it is from below, why there is no attribute .abi?

[cromewar]

@PatrickAlphaC a hand on this one please.

[PatrickAlphaC]

$ brownie console
>>> from brownie import APIConsumer
>>> APIConsumer.__dir__()
["tx", "bytecode", "_contracts", "_project", "_build", "_sources", "topics", "selectors", "signatures", "deploy", "_flattener", "__module__", "__doc__", "__init__", "__iter__", "__getitem__", "__delitem__", "__len__", "__repr__", "_reset", "_revert", "remove", "at", "_add_from_tx", "get_verification_info", "publish_source", "_slice_source", "_dir_color", "abi", "_name", "info", "get_method", "decode_input", "__dict__", "__weakref__", "__new__", "__hash__", "__str__", "__getattribute__", "__setattr__", "__delattr__", "__lt__", "__le__", "__eq__", "__ne__", "__gt__", "__ge__", "__reduce_ex__", "__reduce__", "__subclasshook__", "__init_subclass__", "__format__", "__sizeof__", "__dir__", "__class__"]

The __dir__() function in python shows all the functions and attributes you can call on an object and you can see the _name in there. The documentation likely just doesn't have it in there, but if you look in the source code you can see that attribute is exposed.

And, there is a .abi attribute.

[Nlferu]

@PatrickAlphaC Thanks a lot for that! As I'm new to all of this, that __dir__() function will help me a lot with clarifying things.