Ansible Postgres db creation one-act

pg.pb

---
- hosts: all
  sudo: True
  sudo_user: postgres
  vars:
    super_priv: "ALL"
    ro_priv: "SELECT"
  vars_prompt:
    db: "Database"
    pw: "Password for user"
    super: "Superuser (or blank for db-name)"
    ro: "Read-only user (or blank for none)"
    ro_pw: "Read-only user password (if applicable)"
  tasks:
  - set_fact: port=5432
    when: port is not defined
  - fail: msg="No database"
    when: not db
  - postgresql_db: name="{{db}}" port="{{port}}"
  - postgresql_user: name="{{super|default(db)}}" encrypted="false" password="{{pw}}" db="{{db}}" priv="{{super_priv}}"
    when: pw is defined
  - postgresql_user: name="{{ro}}" encrypted="false" password="{{ro_pw}}" db="{{db}}" priv="{{ro_priv}}" 
    when: not not ro