Salt stack grains data from sqlite3 external pillar - sqlite

Question

I am trying to pull results from a sqlite3 database (set up as an external salt pillar) and use jinja templating to set grains data.
Here is the relevant section of my salt master file:
sqlite3:
database: '/var/lib/salt/stations.db'
timeout: 5.0
ext_pillar:
- sqlite3:
fromdb:
query: 'SELECT * FROM table;'
And here is the relevant part of the init.sls file I am using to create the grains file:
{% set station_id = salt['grains.filter_by']({
{% for row in query_result %}
{% hostname = station_id %}
}, default="UNKNOWN", grain="host") %}
I confirmed that the external pillar produces results by running
salt '*' sqlite3.fetch /var/lib/salt/stations.db 'SELECT * FROM test;'
But I can't figure out how to get results into the jinja file.
I want something like
'SELECT * FROM table WHERE hostname=station_id LIMIT 1;'
and use the result to set the grain environmental variable called 'hostname'.
But am not sure how to get there from here.
Any help is greatly appreciated.

Answer 1

Thanks to the good folks in Saltstack IRC this problem is solved.
Master:
- sqlite3:
station_map:
query: 'SELECT hostname, id
FROM stations
WHERE hostname like ?'
init.sls:
{% set station_id = salt['grains.filter_by']({
{% for row in station_map %}
{{ hostname }} : {{ station_id }}
}, default="UNKNOWN", grain="host") %}