Do Parameters work for Task that are classes and not functio

Question

Do Parameters work for Task that are classes and not functions <https docs v1 prefect io core concepts parameters html> I am trying to pass a Parameter to a ShellTask but it does not look like it works Any example of that

Matt Delacour · Answer

```shell task = ShellTask log stdout=True log stderr=True stream output=True with Flow model on demand as flow select = Parameter select required=True shell task command=f echo select ```

Matt Delacour · Answer

This returns the class and not the value of the Parameter

Bianca Hoch · Answer

Hi Matt this <https prefect community slack com archives CL09KU1K7 p1657900280242449 thread ts=1657830102 625389 amp cid=CL09KU1K7|user> asked a similar question They were able to have the custom task accept the parameter value via the run method Let us know if the example helps

Matt Delacour · Answer

So the solution is to `run ` the Parameter which is a Task But it s not recognized as an input so I cannot trigger the flow with different values of the Parameter in the Web UI So I don t believe that this is a good solution Maybe I don t understand it

Bianca Hoch · Answer

After reviewing this with the team the following example should work for you ```shell task = ShellTask log stdout=True log stderr=True stream output=True task def generate command select return f echo select with Flow model on demand as flow select = Parameter select required=True shell task command=generate command select ``` The string for the command needs to be set within a task It can t be set within the `with Flow ` block because nothing has values at that point

Matt Delacour · Answer

will try that Thank you

Matt Delacour · Answer

So it sounds like it works for `ShellTask` but not for `DbtShellTask` which is a child of it ```class DbtShellTask ShellTask pass``` thinking face

Matt Delacour · Answer

Untitled py

Matt Delacour · Answer

Actually even in the ShellTask it does not work ``` task def generate command select str gt str return f select select with Flow model on demand as dbt flow Models to run on demand select = Parameter select required=True shell task command=f echo HELLO generate command select=select ```

Matt Delacour · Answer

Ok I got it +1