Candid Interface for Canisters - Cannot find field "principal"

[kylelangham]

Hi,

I'm receiving a "cannot find field 'principal' when I run the below code. It seems like the candid did is incorrect, but I've verified it multiple times. Any suggestions on troubleshooting? Thanks!

--------------------------------CODE---------------------------------
from ic.canister import Canister
from ic.client import Client
from ic.agent import Agent
from ic.candid import encode, decode, Types
from ic.identity import Identity

i1 = Identity()
client = Client(url = "https://ic0.app")
agent = Agent(i1, client)

params = []
params = encode(params)

canister_id = 'zqfso-syaaa-aaaaq-aaafq-cai'

response = agent.query_raw(canister_id,'__get_candid_interface_tmp_hack',params)
canister_did = response[0]['value']
canister = Canister(agent=agent, canister_id=canister_id, candid=canister_did)
---------------------------------------ERROR----------------------------------------------------------
Traceback (most recent call last):
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\SNS\test.py", line 20, in
my_canister.list_neurons({ 'of_principal': [], 'limit': 1000, 'start_page_at': []})
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\canister.py", line 57, in call
res = self.agent.query_raw(
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\agent.py", line 79, in query_raw
return decode(result['reply']['arg'], return_type)
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 1297, in decode
'value': t.decodeValue(b, types[i])
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 671, in decodeValue
x[expectKey] = exceptValue.decodeValue(b, v)
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 552, in decodeValue
rets.append(self._type.decodeValue(b, vec._type))
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 859, in decodeValue
return self._type.decodeValue(b, t)
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 671, in decodeValue
x[expectKey] = exceptValue.decodeValue(b, v)
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 552, in decodeValue
rets.append(self._type.decodeValue(b, vec._type))
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 859, in decodeValue
return self._type.decodeValue(b, t)
File "C:\Users\KyleLangham\PycharmProjects\ICPTransactions\venv\lib\site-packages\ic\candid.py", line 674, in decodeValue
raise ValueError("Cannot find field {}".format(keys[idx]))
ValueError: Cannot find field "principal"

Process finished with exit code 1

[Myse1f]

This should be fix in #74 . Later we release a new version. Or you can use the main branch in repository.

[4eku]

I observe a similar problem with some queries. For example code:

import asyncio
from ic.canister import Canister
from ic.client import Client
from ic.identity import Identity
from ic.agent import Agent
from ic.candid import Types

iden = Identity()
client = Client()
agent = Agent(iden, client)
governance_did = open("governance.did").read()
governance = Canister(agent=agent, canister_id="zqfso-syaaa-aaaaq-aaafq-cai", candid=governance_did)
async def async_test():
  res = await governance.list_neurons_async(
    {
        'of_principal': [],
        'limit': 1,
        'start_page_at': []
    }
  )
  print(res)
asyncio.run(async_test())

Executing this code gives the same error as Kyle's.
And if you use a different canister method - everything is ok:

import asyncio
from ic.canister import Canister
from ic.client import Client
from ic.identity import Identity
from ic.agent import Agent
from ic.candid import Types

iden = Identity()
client = Client()
agent = Agent(iden, client)
governance_did = open("governance.did").read()
governance = Canister(agent=agent, canister_id="zqfso-syaaa-aaaaq-aaafq-cai", candid=governance_did)
async def async_test():
  res = await governance.list_proposals_async(
    {
        'include_reward_status': [],
        'before_proposal': [],
        'limit': 1,
        'exclude_type': [],
        'include_status':[],
    }
  )
  print(res)
asyncio.run(async_test())