Yii2 installation using composer giving error - php

Question

I am trying to install Yii2 alpha. When I run the following command after downloading composer and adding
"minimum-stability": "dev"
to composer.json.
$ php composer.phar require yiisoft/yii2-framework "*"
I get the following error.
Problem 1
- The requested package minimum-stability could not be found in any version, there may be a typo in the package name.
Problem 2
- The requested package yiisoft/yii2-composer could not be found in any version, there may be a typo in the package name.
Problem 3
- The requested package yiisoft/yii2-framework could not be found in any version, there may be a typo in the package name.
Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion for more details.
Read http://getcomposer.org/doc/articles/troubleshooting.md for further common problems.
Please help me.

Answer 1

start with
php composer.phar init
and set Minimum Stability[] to dev
then
php composer.phar require yiisoft/yii2 "*"

Answer 2

Here is working composer.json code
{
"name": "yiisoft/yii2-app-advanced",
...
"minimum-stability": "dev",
"require": {
"php": ">=5.4.0",
"yiisoft/yii2": "*",
},
"require-dev": {
"yiisoft/yii2-debug": "*",
"yiisoft/yii2-gii": "*"
},
...
}
Use yii2 against yii2-framework, may be you typed "minimum-stability" in the wrong place. And you don't need type yii2-composer there, it will be installed automatically