Rails - Jul 2013 - Ruby 3 How to get username and password from Ruby app DB and post them to Joomla admin login

I have a model in my RoR app. Two of the attributes of this model is 
username and password, which are the login details of an already installed 
Joomla site. I would like to use a form in RoR app and when the user click 
on the submit button to get these details from my app and post them to 
Joomla login form and submit to login to Joomla backend. I am searching 
about the method i should use. If i have to use Javascript, which is the 
way to do it?

I have some knowledge in RoR but never done something like this before.

Thank you very much, in advance.

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