(Quick Reference)
hasMany
目的
Purpose
Defines a one-to-many association between two classes.
使用例
Examples
class Author { String name static hasMany = [books: Book]
}In this example we define a one-to-many relationship between the
Author and
Book classes (one
Author has many
Books)
詳細
Description
By default GORM will create a property of type
java.util.Set using the key inside the definition of the
hasMany map. For example consider this definition:
static hasMany = [books: Book]
Here a property of type
java.util.Set called
books will be created within the defining class. These can then be iterated over and manipulated:
def a = Author.get(1)
for (book in a.books) { println book.title }
