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Hi if I have the following codes in a controller, does the person object get destroy after the web page is served?
Person p = new Person();
for (int u =0 ...)
{
p = new Person();
p.save();
}
Yes, the object instances are all destroyed after the request is served. In your example, only the data in the database will exist across requests.
Read more about Grails controllers in the official docs. See the section Controllers and Scopes about the different scopes where you can store variables across requests.