example of using match.filter_by to assign different envs default variables

Mapexample

root@8470705f6b2a:/srv/salt# tail -c +0 /srv/salt/*.* /srv/salt/data/*.yml /etc/salt/grains 
==> /srv/salt/data.jinja <==
{%- import_yaml 'data/default.yml' as defaults %}
{%- import_yaml 'data/prod.yml' as prod %}
{%- import_yaml 'data/test.yml' as test %}
{%- import_yaml 'data/dev.yml' as dev %}

{%- set data = salt.slsutil.update(salt.match.filter_by({
    'release:dev': dev,
    'release:test': test,
    'release:prod': prod,
}, tgt_type='grain', merge=defaults, merge_lists=True), salt.config.get('data', {}), merge_lists=true) %}

==> /srv/salt/prod.yml <==
postgres:
  user: prod
  database: mydb
  host: db.prod.gtmanfred.com

redis:
  host: redis.prod.gtmanfred.com

domains:
- www.gtmanfred.com:
    repo: git://github.com/gtmanfred/www.git
    branch: master
- blog.gtmanfred.com:
    repo: git://github.com/gtmanfred/blog.git
    branch: master

==> /srv/salt/test.sls <==
{%- from 'data.jinja' import data %}
{%- do salt.log.error('\n%s'|format(data|yaml(false))) %}

==> /srv/salt/data/default.yml <==
postgres:
  user: myuser
  database: mydb
  host: db.prod.gtmanfred.com

redis:
  host: redis.prod.gtmanfred.com

domains:
- www.gtmanfred.com:
    repo: git://github.com/gtmanfred/www.git
    branch: master
- blog.gtmanfred.com:
    repo: git://github.com/gtmanfred/blog.git
    branch: master

==> /srv/salt/data/dev.yml <==
postgres:
  host: db.dev.gtmanfred.com

redis:
  host: redis.dev.gtmanfred.com

domains:
- www-dev.gtmanfred.com:
    branch: dev
- blog-dev.gtmanfred.com:
    branch: dev

==> /srv/salt/data/prod.yml <==
# This is a place holder file

==> /srv/salt/data/test.yml <==
postgres:
  host: db.test.gtmanfred.com

redis:
  host: redis.test.gtmanfred.com

domains:
- www-test.gtmanfred.com:
    branch: test
- blog-test.gtmanfred.com:
    branch: test

==> /etc/salt/grains <==
release: test

data:
  redis:
    host: nope
root@8470705f6b2a:/srv/salt# salt-call cp.get_template salt://test.sls /dev/null
[ERROR   ] 
domains:
- www.gtmanfred.com:
    branch: master
    repo: git://github.com/gtmanfred/www.git
- blog.gtmanfred.com:
    branch: master
    repo: git://github.com/gtmanfred/blog.git
- www-test.gtmanfred.com:
    branch: test
- blog-test.gtmanfred.com:
    branch: test
postgres:
  database: mydb
  host: db.test.gtmanfred.com
  user: myuser
redis:
  host: nope
local:
    /dev/null