Installing specific apt version with ansible - ansible

Question

I used an ansible playbook to install git:
---
- hosts: "www"
tasks:
- name: Update apt repo
apt: update_cache=yes
- name: Install dependencies
apt: name={{item}} state=installed
with_items:
- git
I checked the installed versions:
$ git --version
git version 1.9.1
But adding these to the ansible playbook: apt: name=git=1.9.1 state=installed
and rerunning results in the following error:
fatal: [46.101.94.110]: FAILED! => {"cache_update_time": 0,
"cache_updated": false, "changed": false, "failed": true, "msg":
"'/usr/bin/apt-get -y -o "Dpkg::Options::=--force-confdef" -o
"Dpkg::Options::=--force-confold" install 'git=1.9.1'' failed:
E: Version '1.9.1' for 'git' was not found\n", "stderr": "E: Version
'1.9.1' for 'git' was not found\n", "stdout": "Reading package
lists...\nBuilding dependency tree...\nReading state
information...\n", "stdout_lines": ["Reading package lists...",
"Building dependency tree...", "Reading state information..."]}

Answer 1

Git package with that specific version is as follows:
git=1:1.9.1-1ubuntu0.2
Your task should be:
apt: name=git=1:1.9.1-1ubuntu0.2 state=present
Regards

Answer 2

You don't need two tasks for updating cache and installing. Your playbook should look like:
---
- hosts: "www"
tasks:
- name: Install dependencies
apt:
name:
- git=1:1.9.1-1ubuntu0.2
state: installed
update_cache: yes
note that Ansible supports wildcarding so you don't necessarily need the full version string