Templating multiple yum .repo files with Ansible template module - jinja2

Question

I am attempting to template yum .repo files. We have multiple internal and external yum repos that the various hosts we manage may or may not use.
I want to be able to specify any number of repos and what .repo file they will be templated in. It makes sense to group these repos in the same .repo file where they have a common purpose (e.g. all centos repos)
I am unable to determine how to combine ansible, yaml and j2 to achieve this. I have tried using the ansible 'with_items', 'with_subelements' and 'with_dict' unsuccessfully.
YAML data
yum_repo_files:
- centos:
- name: base
baseurl: http://mirror/base
- name: updates
baseurl: http://mirror/updates
- epel:
- name: epel
baseurl: http://mirror/epel
Ansible task
- name: create .repo files
template: src=yumrepos.j2 dest="/etc/yum.repos.d/{{ item }}.repo"
with_items: yum_repo_files
j2 template
{% for repofile in yum_repo_files.X %} {# X being the relative index for the current repofile, e.g. centos = 0 and epel = 1 #}
{% for repo in repofile %}
name={{ repo.name }}
baseurl={{ repo.baseurl }}
{% endfor %}
{% endfor %}

Answer 1

When you use with_items with the template module the special variable item will be passed into your jinja template.
Try this:
{% for repofile in item %}
{% for repo in repofile %}
name={{ repo.name }}
baseurl={{ repo.baseurl }}
{% endfor %}
{% endfor %}

Answer 2

user24364's answer helped solve half the issue, I then used some python methods to get the correct data out of the lists and dicts.
Giving the full filename 'centos.repo' rather than 'centos' simplified the logic (and aligned better with the logic for other tasks):
yum_repo_files:
- centos.repo:
- name: base
baseurl: http://mirror/base
- name: updates
baseurl: http://mirror/updates
- epel.repo:
- name: epel
baseurl: http://mirror/epel
The .iterkeys() and .next() methods are used on items to get the repo filenames out of the list of dicts:
- name: create .repo files
template: src=yumrepos.j2 dest="/etc/yum.repos.d/{{item.iterkeys().next()}}"
with_items: yum_repo_files
The .itervalues() method is used to get the list of dicts containing all the keys/values for each given repo:
{% for repofile in item.itervalues() %}
{% for repo in repofile %}
[{{repo.repo}}]
name={{ repo.name }}
baseurl={{ repo.baseurl }}
{% endfor %}
{% endfor %}
I also added some other tasks to clean up unmanaged files, etc. Once I've sanitised the code, I'll post it to the ansible galaxy as nobody else seems to have shared such a role.

Answer 3

Your files would be named as: *.repo.j2; then, you can use fileglob:
- name: create x template
- template: src={{ item }} dest=/tmp/{{ item | basename | regex_replace('.j2','') }}
- with_fileglob:
- files/*.j2
Reference:
https://serverfault.com/questions/578544/deploying-a-folder-of-template-files-using-ansible