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# prefect-community
r

Rhys Mansal

04/26/2022, 9:22 AM
Hi all, I'm having difficulty with the following code.
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param_a = flow.add_task(Parameter("param_a", default=True))
with case(param_a, False):
    task_a = some_task(arg)
task_b = some_task(task_a)
some_task
is being run multiple times with different arguments. When
param_a
is false some of these should be skipped. If I do not use
@task(skip_on_upstream_skip=False)
in the task decorator on
some_task
then all downstream tasks from the first skipped task are skipped, whether they are inside a case or not. If I do, none of them are skipped regardless of what
param_a
is set to. Does anyone have any idea how to get only the tasks inside the with block to skip (and only when
param_a
is true)?
a

Anna Geller

04/26/2022, 11:11 AM
you don't need
flow.add_task(parameter_task)
if you are passing it to downstream tasks and you can explicitly define your flow structure (DAG) based on the value of the parameter using two separate blocks for True and False:
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with Flow("x") as flow:
    param_a = Parameter("param_a", default=True)
    with case(param_a, False):
        task_a = some_task(arg)
        task_b = some_task(task_a)
    with case(param_a, True):
        some_task()
this way, you can skip a specific task based on parameter value for more on parameters, check this post
r

Rhys Mansal

04/26/2022, 11:16 AM
thank you
👍 1
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