Grails loading data once

Question

I have these 2 domains

class Country {
    String name
    static hasMany = [cities:City]
}

class City {

    String name;
    static belongsTo = [country: Country]
   }

The data contained in these 2 tables is relatively big, and they're used in all the screens, every time i choose a country i have to reload all its cities.

How can I load the data only once in memory so i can access it faster in all the screens.

I tried putting cities for eager fetching, and tried using cache plugin.

Thank you

Answer 1

You can configure both domain classes to be cached automatically and also cache the cities relation in Country:

class Country {
    String name
    static hasMany = [cities:City]

    static mapping = {
        cache true
        cities cache:true
    }
}

class City {
    String name
    static belongsTo = [country: Country]

    static mapping = {
        cache true
    }
}