GSP rendering programatically

Question

Suppose I have a gsp snippet stored in my database. How do I programatically merge it with a data model to produce a string.

Answer 1

The applicationContext of any Grails app contains a bean named

groovyPagesTemplateEngine

By default this is a instance of GroovyPagesTemplateEngine. So you might use code like this in your controller or service:

class MyService/MyController {
    def groovyPagesTemplateEngine

    String renderGSPToString(String uri, Map model) {
        groovyPagesTemplateEngine.createTemplate(uri).make(model).toString()
    }
}

NB: this snippet is not really taken from running code, it should just clarify the idea.