ios - Predicate to fetch child files and folders inside a parent folder with coredata -

i have situation apps core-data entities looks

application intends works directory, user can add own files , folders.

i need provide search feature inside folders, user can search files or folders specific values (need iterate through child files , sub folders in sub levels).

can use nspredicate , nsfetchrequest this?

please advice.

if file , folder have many things in common ...
change model bit:

1. make node abstract base class having properties:
   identifier
   title
   relationships:
   parent - to-one -> node
   
2. inherit folder node , add relationship:
   children - to-many ->> node
3. inherit file node , add properties:
   mimetype
   owner
   

take account create (under current coredata implementation) single table containing these properties , relationships.

you able search model nodes (files , folders) title matching given string. use predicate:

[nspredicate predicatewithformat:@"title contains[cd] %@",searchtext] 

however ... not complete solution can not limit search given parent node.

if need limit search, keep parent list each node adding to-many relationship node entity called parents. parents set set upon node parent relationship setting, taking new node parent parents set, coping , adding parent it, setting new node.

this allow more refined search using predicate:

[nspredicate predicatewithformat:@"any parents = %@ , title contains[cd] %@",basenode,searchtext] 

this optimised node may point specific parents set without coping on , on again, bit more complex.

you use nested sets or nested intervals implementation ... guess require lot of work on part.

all requests here done on node entity