Grails - Creating JSON Views and Templates

Description

JSON views are stored with .gson suffix in grails-app/views directory. These files are Groovy script files which can be edited in any Groovy editor.

The format for JSON view is shown below:

json.student {
    name "jhonson"
}

json is an inbuilt variable, which is a sample shown in StreamingJsonBuilder. The above code will be displayed as shown below:

{"student":{"name":"jhonson"}}

Templates can be defined with underscore _. The following sample code file is named as _student.gson:

model {
    Student student
}
json {
    name student.name
    rollno student.rollno
}

Templates can be presented with views as shown below:

model {
    Division division
}
json {
    name division.teacher.name
	rollno division.student.rollno
    addChild g.render(template:"student", model:[student: division.children.max { Student s -> s.rollno } ])
    children g.render(template:"student", collection: division.children, var:'student')
}

You can use tmpl variable for presenting the above code in more compact way:

model {
    Division division
}
json {
    name division.teacher.name
    rollno division.student.rollno
    addChild tmpl.student( division.children.max { Person s -> s.rollno } ] )
    children tmpl.student( division.children )
}