:wave: just upgraded to prefect 2.2.0, and seeing ...
# ask-communitya
Alix Cook
08/26/2022, 2:33 PM👋 just upgraded to prefect 2.2.0, and seeing some odd behavior with parameterized flows. I have a flow with a parameter
name Copy code
{
"type": "object",
"title": "Parameters",
"properties": {
"name": {
"title": "name",
"default": "world"
}
}
} Copy code
prefect.exceptions.SignatureMismatchError: Function expects parameters ['name'] but was provided with parameters ['type', 'title', 'properties']✅ 1
b
Bianca Hoch
08/26/2022, 2:55 PMHi Alix, we have an example in our docs that accomplishes something similar to what you're doing here:
Bianca Hoch
08/26/2022, 2:56 PM Copy code
from prefect import flow, task
from subflow import my_subflow
@task(name="Print Hello")
def print_hello(name):
msg = f"Hello {name}!"
print(msg)
return msg
@flow(name="Hello Flow")
def hello_world(name="world"):
message = print_hello(name)
my_subflow(message)
hello_world("Marvin")Bianca Hoch
08/26/2022, 2:56 PMHere's a bit more documentation on parameters as well to get you started: https://orion-docs.prefect.io/tutorials/first-steps/?h=parameters#run-flows-with-parameters
Bianca Hoch
08/26/2022, 2:57 PMand here is a migration doc as well: https://discourse.prefect.io/t/guide-to-implementing-parameters-between-prefect-1-0-and-2-0/1321
z
Zanie
08/26/2022, 3:07 PM
Do you have a short example of the code where the parameter specification is getting passed to the flow?
a
Alix Cook
08/26/2022, 4:01 PMoh, this might be a problem with the way my manifest json is currently formatted?
Alix Cook
08/26/2022, 4:02 PMhere's my manifest:
Copy code
{
"flow_name": "hello-world",
"import_path": "/path/to/flows/default.py:hello_world",
"parameter_openapi_schema": {
"title": "Parameters",
"type": "object",
"properties": {
"name": {
"title": "name",
"default": "world"
}
},
"required": null,
"definitions": null
}
}Alix Cook
08/26/2022, 4:04 PMand now if im reading these docs correctly i don' tneed a manifest anymore?
Alix Cook
08/26/2022, 4:12 PMyeah, that was it. I had to change the way I was applying the deployments
🙌 1
z
Zanie
08/26/2022, 4:15 PM
👍 great thanks!
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