Creating text file from jinja template with inputs from csv file - ansible

Question

I'm trying to create a text file which goes through the CSV file and populates variables into specific fields.
playbook.yml:
- hosts: localhost
tasks:
- name: "Reading user information"
read_csv:
path: /home/test/vlans.csv
delimiter: ','
register: vlans
- debug: var=vlans
- name: Creating VLANs configuration
template:
src: vlan.conf.j2
dest: /tmp/vlan.conf
Jinja2 Template vlan.conf.j2:
{% for item in vlans %}
!
vlan {{ item.VLAN }}
name {{ item.Description }}
vn-segment {{ item.VNI }}
interface nve1
member vni {{ item.VNI }}
{% endfor %}
and this is a test vlans.csv file:
Tenant,VRF ,VLAN,VNI,Subnet,Description,Good to go
Test,,5,20005,,LAB-Checkpoint-FW-Mgmt,Yes
Test,,208,20208,,LAB-DMZ,Yes Test,,209,20209,,LAB-CSR-MGMT,Yes
Test,10000,210,20210,192.168.12.1/28,LAB-VRF-to-FW,Yes
Prod,,761,20761,,PROD-CORE,Yes
Prod,105,840,20840,172.18.33.1/24,Backups,Yes
Prod,,841,20841,,Transport,Yes
I want to end up with file like in jinja2 template and not repeating line "interface nve 1"

Answer 1

In your question, interface nve1 is inside a loop. It will repeat multiple times in the resulting vlan.conf file.
Use multiple loops in the jinja template to decide what is repeated and what isn't:
{% for item in vlans.list %}
vlan {{ item.VLAN }}
name {{ item.Description }}
vn-segment {{ item.VNI }}
{% endfor %}
interface nve1
{% for item in vlans.list %}
member vni {{ item.VNI }}
{% endfor %}
Note that I've referred to vlans.list in the start of the loops instead of vlans. This is correct as per documentation, but different to the example in the question so it may need adjusting.