How to make a configuration on the base of a scheme from the previous node?

I have a question about python extensions.
The problem is, I have a node, that accepts a table on input. I want to make a configuration dialog, that allows a user to choose a column from the previous node table.
Following the manual, one needs to add a parameter after a class declaration:

class UniVieKnimeNode(knext.PythonNode):
smiles_column = knext.ColumnParameter(label=“SMILES column”,description=“The SMILES column to use”, port_index=0,include_none_column=False )

But the problem is that we have an input schema only inside configure function. If I try to do it inside configure I have an exception:

def configure(self, configure_context, input_schema):
LOGGER.info(“Configuring node”)
LOGGER.info(“Configure context: %s”, configure_context.flow_variables)
self.testing = knext.BoolParameter(“Enable Testing mode”, “All intermediate steps will be returned as ROMol”, False)

py4j.Py4JException: An exception was raised by the Python Proxy. Return Message: Traceback (most recent call last):
File “/home/sergeyadmin/miniconda3/envs/univiestand_env_internal/lib/python3.10/site-packages/py4j/clientserver.py”, line 617, in _call_proxy
return_value = getattr(self.pool[obj_id], method)(*params)
File “/home/sergeyadmin/distr/knime_4.6.1/plugins/org.knime.python3.nodes_4.6.2.v202209150850/src/main/python/knime_node_backend.py”, line 301, in getParameters
parameters_dict = kp.extract_parameters(self._node)
File “/home/sergeyadmin/distr/knime_4.6.1/plugins/org.knime.python3.nodes_4.6.2.v202209150850/src/main/python/knime_parameter.py”, line 77, in extract_parameters
return {“model”: _extract_parameters(obj, for_dialog)}
File “/home/sergeyadmin/distr/knime_4.6.1/plugins/org.knime.python3.nodes_4.6.2.v202209150850/src/main/python/knime_parameter.py”, line 84, in _extract_parameters
result[name] = param_obj._get_value(obj, for_dialog)
File “/home/sergeyadmin/distr/knime_4.6.1/plugins/org.knime.python3.nodes_4.6.2.v202209150850/src/main/python/knime_parameter.py”, line 248, in _get_value
return getattr(obj, self._name)
AttributeError: ‘BoolParameter’ object has no attribute ‘_name’

Hi pirotex,

does the first example not work for you? Could you provide some details? It looks good to me. Why would you need the input schema?

Best regards
Steffen