Step 4: Passing Data Controller to Views and display those in the view

You can pass data controller to views in different way. Suppose you have an array or object as like

       def page_title = 'Home page'

       def page_description = 'Welcome to "Complete Application using grails 3.x" Part 1'

       render(view: "index", model: [page_title: page_title, page_description: page_description])  

This  data should be an array with key / value pairs. Inside your view, you can then access each value using its corresponding key, such as ${key}. In this index page, we can see this data as following :

<div class="jumbotron">

    <h1> ${page_title}</h1>

    <p>${page_description}</p>

</div>

 Same way, you can pass object and other data which you want to.