Groovy and Grails Groovy and Grails Web Development & MVC 3

Question 1

Which Grails filter/interceptor mechanism is used to run logic before or after controller actions?

Accepted Answer

Interceptors

Answer

Grails Interceptors allow you to declare `before` and `after` logic that wraps controller actions, replacing the older Filters artifact.

Question 2

In a Grails GSP, how do you output the value of a Groovy expression?

Accepted Answer

${expression}

Answer

GSP uses `${expression}` GString-style interpolation to evaluate and output Groovy expressions inline in the template.

Question 3

What does the `respond` method in a Grails controller do differently from `render`?

Accepted Answer

It performs content negotiation to return JSON, XML, or HTML based on the request

Answer

The `respond` method uses content negotiation to automatically serialize the object to JSON, XML, or HTML depending on the client's `Accept` header.

Question 4

Which Grails command generates a controller and its associated views for a domain class?

Accepted Answer

grails generate-all

Answer

`grails generate-all <DomainClass>` creates both the controller and the CRUD GSP views scaffolded for that domain class.

Question 5

In Grails, what is the default HTTP method mapped to a controller action named `save`?

Accepted Answer

POST

Answer

By Grails convention, the `save` action responds to HTTP POST requests, used to persist new domain object instances.

Groovy and Grails Practice Test