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# prefect-community
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Sunjay

11/07/2022, 10:19 AM
Hi , can someone tell me how to pass Service Account Info in the prefect_gcp block. I wanted to pass the values from the secrets block but prefect 2 doesn't seem to support json in secret block. What is the best way to get GCP BigQuery client from a dictionary. i.e a way to pass a dictionary from any of the blocks so that I can pass the Service Account Info as a parameter to the to obtain the big query client.
gcp 1
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Kalise Richmond

11/07/2022, 5:58 PM
Hey @Sunjay, are you using the GcpCredentials block? https://prefecthq.github.io/prefect-gcp/bigquery/
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Sunjay

11/08/2022, 1:26 PM
@Kalise Richmond Yes, I am using the GCP credential block and its working now. Thanks. What is the equivalent for defining upstream tasks in prefect 2 ? is it wait_for ?
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Kalise Richmond

11/09/2022, 5:32 PM
Yes, you can use
wait_for
for async calls or if you pass the task output into another task, it is automatically assigned as having upstream and downstream dependencies.
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