Using cloudformation_update_stack and paremeters

[cwilson21]

When trying to update a cloudformation stack, we specify the parameters we want to update and we get an error about other parameters that need to be updated.

Example of what is specified:

{"ParameterKey": "GlusterDiskSizeParameter","ParameterValue": "450"}

The following error comes when using the above parameters:

botocore.exceptions.ClientError: An error occurred (ValidationError) when calling the UpdateStack operation: Parameters: [RDSUsernameParameter, RDSPasswordParameter, ClusterIDParameter] must have values

However when we call that same function, and add each of those Parameters with "UsePreviousValue": True" we get an error indicating invalid parameters

 "stderr": "st2.actions.python.ActionManager: DEBUG    Calling method \"boto3.cloudformation.update_stack\" with kwargs: {'Parameters': ['{\"ParameterKey\":\"GlusterDiskSizeParameter\"', '\"ParameterValue\":\"450\"}', '{\"ParameterKey\":\"RDSUsernameParameter\"', '\"UsePreviousValue\":true}', '{\"ParameterKey\":\"RDSPasswordParameter\"', '\"UsePreviousValue\":true}', '{\"ParameterKey\":\"ClusterIDParameter\"', '\"UsePreviousValue\":true}'], 'StackName': 'Cluster96518'}\nTraceback (most recent call last):\n  File \"/opt/stackstorm/st2/lib/python3.8/site-packages/python_runner/python_action_wrapper.py\", line 395, in <module>\n    obj.run()\n  File \"/opt/stackstorm/st2/lib/python3.8/site-packages/python_runner/python_action_wrapper.py\", line 214, in run\n    output = action.run(**self._parameters)\n  File \"/opt/stackstorm/packs/aws/actions/run.py\", line 36, in run\n    return self.do_method(module_path, cls, aws_action, **kwargs)\n  File \"/opt/stackstorm/packs/aws/actions/lib/action.py\", line 224, in do_method\n    resultset = getattr(obj, action)(**kwargs)\n  File \"/opt/stackstorm/virtualenvs/aws/lib/python3.8/site-packages/botocore/client.py\", line 251, in _api_call\n    return self._make_api_call(operation_name, kwargs)\n  File \"/opt/stackstorm/virtualenvs/aws/lib/python3.8/site-packages/botocore/client.py\", line 512, in _make_api_call\n    request_dict = self._convert_to_request_dict(\n  File \"/opt/stackstorm/virtualenvs/aws/lib/python3.8/site-packages/botocore/client.py\", line 565, in _convert_to_request_dict\n    request_dict = self._serializer.serialize_to_request(\n  File \"/opt/stackstorm/virtualenvs/aws/lib/python3.8/site-packages/botocore/validate.py\", line 270, in serialize_to_request\n    raise ParamValidationError(report=report.generate_report())\nbotocore.exceptions.ParamValidationError: Parameter validation failed:\nInvalid type for parameter Parameters[0], value: {\"ParameterKey\":\"GlusterDiskSizeParameter\", type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[1], value: \"ParameterValue\":\"450\"}, type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[2], value: {\"ParameterKey\":\"RDSUsernameParameter\", type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[3], value: \"UsePreviousValue\":true}, type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[4], value: {\"ParameterKey\":\"RDSPasswordParameter\", type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[5], value: \"UsePreviousValue\":true}, type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[6], value: {\"ParameterKey\":\"ClusterIDParameter\", type: <class 'str'>, valid types: <class 'dict'>\nInvalid type for parameter Parameters[7], value: \"UsePreviousValue\":true}, type: <class 'str'>, valid types: <class 'dict'>\n",

We also are selecting to use the existing template as we are just updating and replacing a parameter in it. Any assistance on what we are doing wrong or how to move forward with this would be appreciated.

[cwilson21]

Figured this out. You have to nest UsePreviousValue under ParameterValue