an illustrative guide to master the spree e-commerce - e-commerce

i am newbie to spree e-commerce, after reading many queries & answers i understood that using spree is not easy for our custom needs of e-commerce sites. anyhow, is there any illustrative guide ( other than spree official guide) /tutorial to learn & use the spree e-commerce effectively ? plz., inform

Unfortunately, you're correc tin that Spree is not "easy." This is because Spree was made "by developers for developers." If you don't have an extensive knowledge of rails, or want a ecommerce solution that doesn't require much coding, Spree is certainly not for you.

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Authentication system in Rails 3 . Devise / omniauth or self coded?

I am a newbie in ROR developement. I am trying to create my own application with the help of Ruby on Rails tutorial 2nd edition. I made many reseaches. I need your comments about devise or any other authentications system or as the book offers us to write our own authentication systems.
What are your ideas? Is it wasting time to write your own authentication system?
i'm quite new to RoR myself but i used Devise so far (and according to the book i'm currently reading it is worth it).
You could use the Railscasts about Devise if you want an introduction to it:
http://railscasts.com/episodes/209-introducing-devise
And as it is quite easy to learn and well featured i'd say it is pretty overkill to write your own.
I am a huge advocate of Devise, and also of not recreating the wheel. My rebuttal question would be why go through the trouble of creating your own authentication solution, when in just a few short bash commands, Devise will be installed and running. The configuration options alone are enough to choose Devise, not to mention that almost every part of the engine has the ability to be overridden with your own code.
There are hundreds of blog posts out there that can easily get you started with running Devise. As always with any gem, I would recommend starting out with browsing the source code, and then turning to the wiki for the answers that you seek. As #krizz mentioned, Ryan Bates' Railscasts are always a great place to turn when you need to see it setup.
And of course, you can always turn back here to the stack when you get stuck.

Questions regarding Joomla and VirtueMart

I need to create an e-commerce website. I am thinking if I can use Joomla and VirtueMart to finish it. I have never used VirtueMart before. I am just worrying about if this solution is great. VirtueMart is a shopping cart… is it easy to link it with payment gateway from different banks? Is it secure? Thank you for any suggestions. Many thanks
Virtuemart is probably one of the biggest shopping carts available for Joomla. It's one of the most comprehensive to my knowledge and I believe that it will accept payment gateway from different banks. How easy that is to setup is a subjective question... it would depend on your level of comfort with those things. In my experience Virtuemart is very full figured, secure and is a great ecommerce platform. Since they've released it for 1.7 it should in theory work with 2.5 (the LTS release). Their support has always been highly reviewed and the user community is large as well.
I've used it before in the past with great success but the sites were much more simple and didn't include working with multiple banks - just paypal support.
Anyhow, I hope this information helps!

Rails 3: A/B Testing App Features

What's the best way of AB Testing new features and keeping track of the results?
Regards,
Donald
There's a gem called Vanity which is designed for A/B testing in Rails (and appears to work in Rails 3).
Here's a tutorial on Vanity.
I've just released a gem that integrates the Google Analytics Experiments API with Rails. It is pretty full-featured and the reporting is right in Google Analytics. It uses a bandit algorithm, allows you to specify a subset of the audience to test and more.
https://github.com/dlangevin/gxapi_rails
I've personally used split and I've found it to be quite nice, especially with respect to the dashboard it provides for you.

Forum solution for Rails 3 and Devise?

I'm looking for a forum solution for a website I'm building. I'm using Devise and Rails 3, so does there exist any pluggable solutions?
What about 3rd party services?
The goal of Community, is to provide a simple, and easy to setup forum application without having to dictate how your site it setup.
https://github.com/gitt/community
You could build one yourself, you'll be surprised that it's not that time consuming, and you won't have to deal with the bloat that 3rd party solutions might come with. Here is a good place to start.
Savage Beast, Altered Beast and rBoard may be good starting points, but note that they are only for Rails 2.x afaics.
Note: rBoard has a Rails 3 branch but I have no idea how stable that is.

SimpleDB with Rails

Are there any good tutorials to learn basics of SimpleDB with Rails?
Using Amazon SimpleDB with Ruby on Rails
http://www.slideshare.net/martin.rehfeld/amazon-simple-db-07-feb-2008-rug-b
Ruby on Rails Tutorial Learn Rails by Example Michael Hartl
This is one of great tutorial that any new comer can follow. It's have some great examples that we can easily understand.