Are you initializing your output anchor?
Link to docs
The basic process looks something like this:
1. During your plugin's pi_init method, get the output anchor
2a. If your tool is an input tool, initialize the output in pi_push_all_records
2b. If your tool accepts incoming data, initialize the output during (one of) the incoming connection's ii_init methods
An input tool might look something like this:
class AyxPlugin:
def __init__(self, n_tool_id: int, alteryx_engine: object, output_anchor_mgr: object):
self.output_anchor_mgr: Sdk.OutputAnchorManager = output_anchor_mgr
self.Output: Sdk.OutputAnchor = None
def pi_init(self, str_xml: str):
self.Output = self.output_anchor_mgr.get_output_anchor('Output')
def pi_push_all_records(self, n_record_limit: int) -> bool:
# Some code to generate your recordinfo
self.Output.init(record_info)
# Rest of code to push data to your output anchor
A tool that accepts incoming connections might look like this:
class AyxPlugin:
def __init__(self, n_tool_id: int, alteryx_engine: object, output_anchor_mgr: object):
self.output_anchor_mgr: Sdk.OutputAnchorManager = output_anchor_mgr
self.Output: Sdk.OutputAnchor = None
def pi_init(self, str_xml: str):
self.Output = self.output_anchor_mgr.get_output_anchor('Output')
def pi_add_incoming_connection(self, str_type: str, str_name: str) -> object:
return IncomingInterface(self)
class IncomingInterface:
def __init__(self, parent: AyxPlugin):
self.parent = parent
def ii_init(self, record_info_in: object) -> bool:
# Some code to generate your outgoing recordinfo based on incoming fields
self.parent.Output.init(record_info_out)
# The rest of your init code
Basically, the init method causes the SDK to send a message to Alteryx that allows connected tools to receive a preview of the data structure you are sending. This allows tools with FieldSelectors or Select tool functionality to fill in their interfaces with the incoming field info.
