Swift Core Data Relationship to Same Entity

Hello,

i'm new to Swift Programming and I'm struggling with Core Data a bit.

My Data Model looks like the following:

I have Items with multiple values like id, name, description, etc... nothing special, BUT Items can have "parts" that they are made of.

For example:

• Item1
  ID: 1
  Name: One
  Parts:
  • Subitem1
    ID:2
    Name: SubOne
  • Subitem2
    ID: 3
    Name: SubTwo
    Parts:

    Subsub1
    ID:4
    Name: SububTwo

• Item2
  ID: 5

The setup in the xcdatamodelc is fairly simple, but i don't actually know how to fill it with data and save it.

The data comes from a mysql database (there is a column "isPartOf" which specifies the parent-child relationship).

I haven't found any resource on google which is addressing a similar setup, can anyone help me with my problem or knows Links/Books with information that can help me?

Thank you