About schemas variable

schemas is a variable available in an on-run-end hook, representing a list of schemas that dbt built objects in on this run.

If you do not use custom schemas, schemas will evaluate to your target schema, e.g. ['dbt_alice']. If you use custom schemas, it will include these as well, e.g. ['dbt_alice', 'dbt_alice_marketing', 'dbt_alice_finance'].

The schemas variable is useful for granting privileges to all schemas that dbt builds relations in, like so (note this is Redshift specific syntax):

dbt_project.yml

...

on-run-end:
  - "{% for schema in schemas%}grant usage on schema {{ schema }} to group reporter;{% endfor%}"
  - "{% for schema in schemas %}grant select on all tables in schema {{ schema }} to group reporter;{% endfor%}"
  - "{% for schema in schemas %}alter default privileges in schema {{ schema }}  grant select on tables to group reporter;{% endfor %}"

Want more in-depth instructions on the recommended way to grant privileges?

We've written a full discourse article here