Swift5和Coredata：按相关实体 - 属性进行排序
即使我冒着两次问问题的风险，我太盲目了，看不到：
如何通过相关实体的属性对提取物进行分类。在我的特殊情况下，我有三张桌子：
client＆lt; - ＆gt; clienttocontacts＆lt; - ＆gt;联系人。在列表视图中，我喜欢列出所有由contacs.lastname排序的clienttocontacs。
我该如何通过andDeScriptor进行操作？
到目前为止，这是我的fetchrequest。但是sortDeScriptor丢了错误。
sortDescriptors: [
NSSortDescriptor(keyPath: \ClientsToContacts?.toContacts!.lastName, ascending: true),
NSSortDescriptor(keyPath: \ClientsToContacts?.toContacts!.firstName, ascending: true)
],
predicate: NSPredicate(format: "(toContacts.lastName CONTAINS[cd] %@) OR (toContacts.firstName CONTAINS[cd] %@) OR (toContacts.company CONTAINS[cd] %@) OR (toContacts.department CONTAINS[cd] %@) OR (toContacts.zip CONTAINS[cd] %@)", filter, filter, filter, filter, filter),
animation: .default
到目前为止，谓词正常工作，并过滤了我的结果。只是分类...
感谢您的帮助。 :-)
Even if I run the risk of asking a question twice and I'm too blind to see:
How can I sort a FetchRequest by an Attribute of an related Entity. In my special case, I've got three tables:
Client <-> ClientToContacts <-> Contacts. In a List View I like to list all ClientToContacs sorted by Contacs.lastName.
How can I do it by sortDescriptors?
This is my FetchRequest so far. But the sortDescriptors throw errors.
sortDescriptors: [
NSSortDescriptor(keyPath: \ClientsToContacts?.toContacts!.lastName, ascending: true),
NSSortDescriptor(keyPath: \ClientsToContacts?.toContacts!.firstName, ascending: true)
],
predicate: NSPredicate(format: "(toContacts.lastName CONTAINS[cd] %@) OR (toContacts.firstName CONTAINS[cd] %@) OR (toContacts.company CONTAINS[cd] %@) OR (toContacts.department CONTAINS[cd] %@) OR (toContacts.zip CONTAINS[cd] %@)", filter, filter, filter, filter, filter),
animation: .default
The predicate works fine so far and filters my results. Only sorting...
Thanks for helping. :-)
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