How to Sort a Slice of Multi-Level Structures in Go: Sorting Parents and Children Based on IDs?

Sorting Multi-Level Structures within a Slice in Go

This question seeks to sort a slice of custom structures called Parent and Child based on multiple criteria. Each Parent has a slice of Child objects, and the desired outcome is to sort the parents by their IDs and then sort the child slices within each parent by their own IDs.

Solution:

The provided code achieves this sorting using the following steps:

1. Parent Sort: Utilize the sort.Slice function to sort the parents slice based on the Parent.id field. This function sorts a slice in-place based on a custom comparison function.
2. Child Sort: Iterate through each Parent in the sorted parents slice and apply the same sort.Slice function to its child slice, this time using Child.id as the comparison field.

By following these steps, the parents slice is sorted by its parent IDs, and each parent's child slice is further sorted by its child IDs. The result is a structure where the hierarchy of IDs is maintained and the elements are ordered according to the desired criteria.

This approach leverages the flexibility of sort.Slice to perform both single-level and nested sorting operations, resulting in the expected output.

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