Question

使用以下代码：

<g:each in="${books.sort{it.date}}" status="i" var="book"> 
    ${book}
</g:each>

我想显示按日期排序的书籍;另外，我希望当前登录的人创作的书首先出现。

这可能吗？

Answer 1

不确定要实现的目标，但您可以这样做。在将books列表传递给GSP之前，您可以这样写：

def myAction() {
     List books = Book.list()  // Get your book list

     User loggedInUser = User.first()  // Get your currently logged in user

     // First get all the books of current user sorted by the date
     List currentUsersBooks = books.findAll { it.author.id == loggedInUser.id }.sort{ it.date }

     // Then get other books sorted by date
     List otherBooks = books.findAll { it.author.id != loggedInUser.id }.sort{ it.date }

     // Now merge all of them (as `List` will maintain insertion order)
     // So current user's book will be listed first and then others
     List allBooks = currentUsersBooks + otherBooks

     [books: allBooks]
}

现在，修改您的GSP，不要再次排序：

<g:each in="${books}" status="i" var="book"> 
   ${book}
</g:each>

考虑到Book和User域类，如下所示：

class User {
     String email
}

class Book {
     Strig title
     User author
}

Grails中的两个排序规则

1 个答案: