roles/postgresql/defaults/main.yml

@@ -1,5 +0,0 @@
----
-postgresql_hosts: []
-postgresql_databases: []
-postgresql_users: []
-...

roles/postgresql/tasks/main.yml

@@ -55,7 +55,7 @@
     lc_collate: en_US.UTF-8
     lc_ctype: en_US.UTF-8
     template: template0
-  loop: "{{ postgresql.databases }}"
+  loop: "{{ postgresql.databases | default([]) }}"
 
 - name: Create users
   become: true
@@ -65,7 +65,7 @@
     name: "{{ item.name }}"
     password: "{{ item.password }}"
   no_log: true
-  loop: "{{ postgresql.users }}"
+  loop: "{{ postgresql.users | default([]) }}"
 
 - name: Grant privileges to users
   become: true
@@ -77,5 +77,5 @@
     privs: "{{ item.privs | join(',') }}"
     obj: "{{ item.database }}"
   no_log: true
-  loop: "{{ postgresql.users }}"
+  loop: "{{ postgresql.users | default([]) }}"
 ...

roles/postgresql/templates/postgresql/pg_hba.conf.j2

@@ -2,6 +2,6 @@
 
 # TYPE  DATABASE        USER            ADDRESS                 METHOD
 local   all             postgres                                peer map=map_local
-{% for host in postgresql.hosts %}
+{% for host in postgresql.hosts | default([]) %}
 host "{{ host.database }}" "{{ host.user }}" {{ host.net }} {{ host.method }}
 {% endfor %}