Question

Hey. Imagine i have a something like this:

class Car{ 
String name
String color
String mark


}

class Motion {
String name 
Car carName
}

And i have my view (motion.gsp):

<g:each in="${motion}">

  <li>Name: ${it.name}, <br>carName: ${it.carName}, </li>
<br>
</g:each>

What i need to do is, have a link in the ‘it.carName’ field so, when i click on it, it redirects me to a new page (car.gsp) which will be almost the same as’motion.gsp’ but will show the car’s properties.

So i checked grails auto-generated gsp files ‘show’ and saw something like this:

#

<td><g:link action="show" id="${countryInstance.id}">${fieldValue(bean: countryInstance, field: "id")}</g:link></td>

#

But i dont think i understand what it does. So my questions are:

a) please explain me how the code betwen ## work.

b) if possible, give me a small hint for the code i need to update to my motion.gsp

Answer 1

g:link does nothing more than generate a populated <a href=''>. Check out the documentation here:

basically, in Grails, you have Models, Views, and Controllers. The g:link tag facilitates generating links that make sense according to the Grails MVC convention. The appropriate names parameters of g:link specify which controller, and which action on that controller, to invoke in the link, as well as parameters to pass to the action.

Just try it, its not complicated.