added playgrounds just to show off

Playground.playground/Contents.swift

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+import UIKit
+import CoreStore
+
+class Animal: CoreStoreObject {
+    let species = Value.Required<String>("species", initial: "Swift")
+    let master = Relationship.ToOne<Person>("master")
+    let color = Transformable.Optional<UIColor>("color", initial: .orange)
+}
+
+class Person: CoreStoreObject {
+    let name = Value.Required<String>("name", initial: "")
+    let pets = Relationship.ToManyUnordered<Animal>("pets", inverse: { $0.master })
+}
+
+
+let dataStack = DataStack(
+    CoreStoreSchema(
+        modelVersion: "V1",
+        entities: [
+            Entity<Animal>("Animal"),
+            Entity<Person>("Person")
+        ]
+    )
+)
+try dataStack.addStorageAndWait()
+
+dataStack.perform(synchronous: { transaction in
+
+    let animal = transaction.create(Into<Animal>())
+    animal.species .= "Sparrow"
+    animal.color .= .yellow
+
+    let person = transaction.create(Into<Person>())
+    person.name .= "John"
+    person.pets.value.insert(animal)
+})
+
+let bird = dataStack.fetchOne(From<Animal>().where(\.species == "Sparrow"))!
+bird.species.value
+bird.color.value
+print(bird)
+
+let owner = bird.master.value!
+owner.name.value
+owner.pets.count
+print(owner)

Playground.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>