CODEWITHSUNDEEP
grailsgroovyrequest
user721588
user721588

Reputation:

Groovy Grails - store object for subsequent requests

I have a web application and front-end makes ajax request to server in order to get data. In controller I have following logic:

def data = []

def method() {
  def objects = []
  ...
  from params determine if it is a first request
  ...
  if (firstRequest) {
    objects = someService.getObjectFromDB()
    data = objects
  } else {
    actions with data object
  }

But the problem is that for the 2+ requests data is an empty list despite the fact that during the first request I populate it with needed information. How can I use data object is 2+ requests?

Upvotes: 1

Views: 3001

Answers (2)

dmahapatro
dmahapatro

Reputation: 50245

I would suggest to move the above logic from the controller to the service class. Benefits of doing this:-

1.Service is by default singleton. You can set the scope to request as a result of which you would get an handle to the global data per request.

2.Session will not be overloaded with data.

3.Best part:- You can pass in params &/| request (defaults of a Controller) to service layer in method calls.

Upvotes: 1

Marco
Marco

Reputation: 15909

Store the data object in the user sessions like:

session.data = objects

And when you enter the method check of the data is already there..

if (!session?.data) {
    // first request
    objects = someService.getObjectFromDB()
    session.data = objects
} else {
    // retrieve data from session
    def oldData = session.data
    // do something
}

This is probably not the best solution because you will store a lot of information in the session so try to restrict that to a minimal.

Upvotes: 3

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