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PublicTraining Class
class PublicTraining{ static hasMany = [trainingOrder: TrainingOrder] } and TrainingOrder Class
class TrainingOrder { Date createdOn static mapping = { sort id:"asc" } } if i want to get all the orders for training
def orders = publicTrainingInstance.trainingOrder.sort() println orders // [59,58] (id of orders) which does not give sorted orders
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sort() method to sort a list of objects using some examples. By default, the sort() method sorts a given list into ascending order (or natural order). We can use Collections. reverseOrder() method, which returns a Comparator, for reverse sorting.
In the main() method, we've created an array list of custom objects list, initialized with 5 objects. For sorting the list with the given property, we use the list's sort() method. The sort() method takes the list to be sorted (final sorted list is also the same) and a comparator.
Maps don't have an order for the elements, but we may want to sort the entries in the map. Since Groovy 1.7. 2 we can use the sort() method which uses the natural ordering of the keys to sort the entries. Or we can pass a Comparator to the sort() method to define our own sorting algorithm for the keys.
Default sort() is useful for Comparable object. If your class is not a Comparable, use:
def orders = publicTrainingInstance.trainingOrder.sort { it.id } That code will sort by using passed id.
See docs: http://groovy.codehaus.org/groovy-jdk/java/util/Collection.html#sort()
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