Sorry pressed enter too early The issue I am seeing is that

Question

Sorry pressed enter too early The issue I am seeing is that From UI when I run MasterFlow it does not give me an option to populate cobdate

Matt Wong-Kemp · Answer

You need to pass the parameter as a runtime option I think at the minute you re creating a dict with one field `cobdate` which container the Parameter object not the value

Matt Wong-Kemp · Answer

``` task def prepare parameters cobdate return dict cobdate=cobdate with Flow MasterFlow as master flow cobdate = Parameter cobdate staging parameters = prepare parameters cobdate staging area = FlowRunTask flow name= staging area parameters=staging parameters project name= SubFlow ```

Vipul · Answer

Thanks for quick reply You mean I need to create a new task to pass this parameter to FlowRunTask Just wondering why can t it directly get it from Parameter as I thought Parameter value can be updated runtime

Vipul · Answer

< Matt Wong Kemp> Also if I make change as suggested by you I am getting the following error File d 1 vipul 1 tech python prefect venv lib site packages prefect client client py line 965 in create flow run res = self graphql create mutation variables=dict input=inputs File d 1 vipul 1 tech python prefect venv lib site packages prefect client client py line 280 in graphql params=dict query=parse graphql query variables=json dumps variables File C Program Files x86 Python lib json init py line 231 in dumps return default encoder encode obj File C Program Files x86 Python lib json encoder py line 199 in encode chunks = self iterencode o one shot=True File C Program Files x86 Python lib json encoder py line 257 in iterencode return iterencode o 0 File C Program Files x86 Python lib json encoder py line 179 in default raise TypeError f Object of type o class name TypeError Object of type FunctionTask is not JSON serializable

Vipul · Answer

` gt res = self graphql create mutation variables=dict input=inputs ` ` Pdb inputs` ` flow id bc156d0a b2dc 4425 85a6 10e2a9a5ef1f parameters lt Task prepare parameters gt idempotency key db6be705 45eb 4a99 adea 86c4506227d9 ` I think the JSON error is due to fact that parameters has value of lt Task prepare parameters gt and JSON does not know how to serialiaze it < nicholas>

nicholas · Answer

< Vipul> when running the flow from the UI you ll need to navigate to the `Run` tab here

nicholas · Answer

And then in your original flow you can make `cobdate` required or give it a default ```with Flow MasterFlow as master flow cobdate = Parameter cobdate required=True OR Parameter cobdate default= some default Then pass the parameters to the runtime context of FlowRunTask instead of the Class instantiation staging area = FlowRunTask flow name= staging area project name= SubFlow parameters= cobdate cobdate business logic layer = FlowRunTask flow name= business logic layer project name= SubFlow data mart = FlowRunTask flow name= data mart project name= SubFlow wait=True staging area set downstream data mart business logic layer set downstream data mart ```

Vipul · Answer

Wonderful < nicholas> that worked thanks for your help and < Matt Wong Kemp>

nicholas · Answer

Great

Vipul · Answer

Hey < nicholas> it worked based on your approach but what I have seen from the schematic is that adding the line ```staging area = FlowRunTask flow name= staging area project name= SubFlow parameters= cobdate cobdate ``` has cause two extra tasks to be added as List and Dict before calling Flow staging area is this expected behaviour Thanks