Function name is not constant: name, requires to sign transaction

[arenzel]

What I do

Calling a simple "name" function on my smartcontract, which is a pure function that returns a string.
The abi of this function:

# config/web3.yml
contract_abi = "[{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"}]"

More readable version:

[{"inputs"=>[],
  "name"=>"name",
  "outputs"=>[{"internalType"=>"string", "name"=>"", "type"=>"string"}],
  "stateMutability"=>"view",
  "type"=>"function"}]

The error

When calling the function, I got the following error:

RuntimeError:
       Function name is not constant: name, requires to sign transaction

I'm surprised that the lib asks for a signature, whereas - AFAIK - pure functions are not supposed to require signature, right? 🤔

---

My code

class ContractService
  def initialize
    contract_address = "0x..."
    provider = Web3::Eth::Rpc.new(
      host: infura_url,
      port: 443,
      connect_options: {
        open_timeout: 200,
        read_timeout: 1400,
        use_ssl: true,
        rpc_path: "/v3/#{Rails.configuration.web3['infura_project_id']}"
      }
    )
    contract_abi = Rails.configuration.web3["contract_abi"]
    contract_factory = provider.eth.contract(contract_abi)

    @contract_instance = contract_factory.at(contract_address)
  end

  def name
    result = @contract_instance.name
    puts result
  end
end

# Function call
ContractService.new.name

[erikmingo]

I am having the same issue. Will try to pull the gem locally and figure it out. I'll keep you posted.