Making posts from WordPress in Ruby on Rails?

So I'm working as a software apprentice and I have to re-build a website. Basically what the website does is: post different things (events,news,etc.) and all these posts have like a preview and then when you click on it, it takes you to the post. The way thay it works is: in the code it has a template for the design of every post. But if you want to make a new post, you need to do it from WordPress. So know I'm looking the way to do that, I think that the first developer used json to "call" the data from the database in WordPress (I guess).

So I hope that someone can help me with a different or a easier option to do that.

Thanks