Added pure code-first example (ChilliCream#3)

PureCodeFirst/.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (web)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/StarWars.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}",
+            "stopAtEntry": false,
+            "serverReadyAction": {
+                "action": "openExternally",
+                "pattern": "^\\s*Now listening on:\\s+(https?://\\S+)"
+            },
+            "env": {
+                "ASPNETCORE_ENVIRONMENT": "Development"
+            },
+            "sourceFileMap": {
+                "/Views": "${workspaceFolder}/Views"
+            }
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

PureCodeFirst/.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "shell",
+            "args": [
+                "build",
+                // Ask dotnet build to generate full paths for file names.
+                "/property:GenerateFullPaths=true",
+                // Do not generate summary otherwise it leads to duplicate errors in Problems panel
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "group": "build",
+            "presentation": {
+                "reveal": "silent"
+            },
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

PureCodeFirst/Charachters/CharacterQueries.cs

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+using System.Collections.Generic;
+using HotChocolate;
+using HotChocolate.Types;
+using HotChocolate.Types.Relay;
+using StarWars.Repositories;
+
+namespace StarWars.Characters
+{
+    [ExtendObjectType(Name = "Query")]
+    public class CharacterQueries
+    {
+        /// <summary>
+        /// Retrieve a hero by a particular Star Wars episode.
+        /// </summary>
+        /// <param name="episode">The episode to look up by.</param>
+        /// <param name="repository"></param>
+        /// <returns>The character.</returns>
+        public ICharacter GetHero(
+            Episode episode,
+            [Service]ICharacterRepository repository) =>
+            repository.GetHero(episode);
+
+        /// <summary>
+        /// Gets all character.
+        /// </summary>
+        /// <param name="repository"></param>
+        /// <returns>The character.</returns>
+        [UsePaging]
+        [UseFiltering]
+        [UseSorting]
+        public IEnumerable<ICharacter> GetCharacters(
+            [Service]ICharacterRepository repository) =>
+            repository.GetCharacters();
+
+        /// <summary>
+        /// Gets a character by it`s id.
+        /// </summary>
+        /// <param name="ids">The ids of the human to retrieve.</param>
+        /// <param name="repository"></param>
+        /// <returns>The character.</returns>
+        public IEnumerable<ICharacter> GetCharacter(
+            int[] ids,
+            [Service]ICharacterRepository repository) =>
+            repository.GetCharacters(ids);
+
+        public IEnumerable<ISearchResult> Search(
+            string text,
+            [Service]ICharacterRepository repository) =>
+            repository.Search(text);
+    }
+}

PureCodeFirst/Charachters/Droid.cs

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+using System.Collections.Generic;
+using HotChocolate.Types;
+using HotChocolate.Types.Relay;
+
+namespace StarWars.Characters
+{
+    /// <summary>
+    /// A droid in the Star Wars universe.
+    /// </summary>
+    public class Droid : ICharacter
+    {
+        public Droid(
+            int id,
+            string name,
+            IReadOnlyList<int> friends,
+            IReadOnlyList<Episode> appearsIn,
+            string primaryFunction,
+            double height = 1.72d)
+        {
+            Id = id;
+            Name = name;
+            Friends = friends;
+            AppearsIn = appearsIn;
+            PrimaryFunction = primaryFunction;
+            Height = height;
+        }
+
+        /// <inheritdoc />
+        public int Id { get; }
+
+        /// <inheritdoc />
+        public string Name { get; }
+
+        /// <inheritdoc />
+        [UsePaging(SchemaType = typeof(InterfaceType<ICharacter>))]
+        [GetFriendsResolver]
+        public IReadOnlyList<int> Friends { get; }
+
+        /// <inheritdoc />
+        public IReadOnlyList<Episode> AppearsIn { get; }
+
+        /// <summary>
+        /// The droid's primary function.
+        /// </summary>
+        public string PrimaryFunction { get; }
+
+        /// <inheritdoc />
+        [UseConvertUnit]
+        public double Height { get; }
+    }
+}

PureCodeFirst/Charachters/Episode.cs

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+namespace StarWars.Characters
+{
+    /// <summary>
+    /// The Star Wars episodes.
+    /// </summary>
+    public enum Episode
+    {
+        /// <summary>
+        /// Star Wars Episode IV: A New Hope
+        /// </summary>
+        NewHope,
+
+        /// <summary>
+        /// Star Wars Episode V: Empire Strikes Back
+        /// </summary>
+        Empire,
+
+        /// <summary>
+        /// Star Wars Episode VI: Return of the Jedi
+        /// </summary>
+        Jedi
+    }
+}

PureCodeFirst/Charachters/GetFriendsResolverAttribute.cs

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+using System.Linq;
+using System.Reflection;
+using HotChocolate.Types;
+using HotChocolate.Types.Descriptors;
+using StarWars.Repositories;
+
+namespace StarWars.Characters
+{
+    public sealed class GetFriendsResolverAttribute
+        : ObjectFieldDescriptorAttribute
+    {
+        public override void OnConfigure(
+            IDescriptorContext context,
+            IObjectFieldDescriptor descriptor,
+            MemberInfo member)
+        {
+            descriptor.Resolver(ctx =>
+            {
+                ICharacter character = ctx.Parent<ICharacter>();
+                ICharacterRepository repository = ctx.Service<ICharacterRepository>();
+                return repository.GetCharacters(character.Friends.ToArray());
+            });
+        }
+    }
+}

PureCodeFirst/Charachters/Human.cs

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+using System.Collections.Generic;
+using HotChocolate.Types;
+using HotChocolate.Types.Relay;
+
+namespace StarWars.Characters
+{
+    /// <summary>
+    /// A human character in the Star Wars universe.
+    /// </summary>
+    public class Human : ICharacter
+    {
+        public Human(
+            int id, 
+            string name, 
+            IReadOnlyList<int> friends, 
+            IReadOnlyList<Episode> appearsIn, 
+            string? homePlanet = null, 
+            double height = 1.72d)
+        {
+            Id = id;
+            Name = name;
+            Friends = friends;
+            AppearsIn = appearsIn;
+            HomePlanet = homePlanet;
+            Height = height;
+        }
+
+        /// <inheritdoc />
+        public int Id { get; }
+
+        /// <inheritdoc />
+        public string Name { get; }
+
+        /// <inheritdoc />
+        [UsePaging(SchemaType = typeof(InterfaceType<ICharacter>))]
+        [GetFriendsResolver]
+        public IReadOnlyList<int> Friends { get; }
+
+        /// <inheritdoc />
+        public IReadOnlyList<Episode> AppearsIn { get; }
+
+        /// <summary>
+        /// The planet the character is originally from.
+        /// </summary>
+        public string? HomePlanet { get; }
+
+        /// <inheritdoc />
+        [UseConvertUnit]
+        public double Height { get; }
+    }
+}

PureCodeFirst/Charachters/ICharacter.cs

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+using System.Collections.Generic;
+using HotChocolate.Types;
+using HotChocolate.Types.Relay;
+
+namespace StarWars.Characters
+{
+    /// <summary>
+    /// A character in the Star Wars universe.
+    /// </summary>
+    [InterfaceType(Name = "Character")]
+    public interface ICharacter : ISearchResult
+    {
+        /// <summary>
+        /// The unique identifier for the character.
+        /// </summary>
+        int Id { get; }
+
+        /// <summary>
+        /// The name of the character.
+        /// </summary>
+        string Name { get; }
+
+        /// <summary>
+        /// The ids of the character's friends.
+        /// </summary>
+        [UsePaging(SchemaType = typeof(InterfaceType<ICharacter>))]
+        IReadOnlyList<int> Friends { get; }
+
+        /// <summary>
+        /// The episodes the character appears in.
+        /// </summary>
+        IReadOnlyList<Episode> AppearsIn { get; }
+
+        /// <summary>
+        /// The height of the character.
+        /// </summary>
+        [UseConvertUnit]
+        double Height { get; }
+    }
+}

PureCodeFirst/Charachters/ISearchResult.cs

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+using HotChocolate.Types;
+
+namespace StarWars.Characters
+{
+    [UnionType(Name = "SearchResult")]
+    public interface ISearchResult
+    {
+    }
+}

PureCodeFirst/Charachters/Starship.cs

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+namespace StarWars.Characters
+{
+    /// <summary>
+    /// A starship in the Star Wars universe.
+    /// </summary>
+    public class Starship : ISearchResult
+    {
+        public Starship(int id, string name, double length)
+        {
+            Id = id;
+            Name = name;
+            Length = length;
+        }
+
+        /// <summary>
+        /// The Id of the starship.
+        /// </summary>
+        public int Id { get; }
+
+        /// <summary>
+        /// The name of the starship.
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// The length of the starship.
+        /// </summary>
+        [UseConvertUnit]
+        public double Length { get; }
+    }
+}

PureCodeFirst/Charachters/Unit.cs

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+namespace StarWars.Characters
+{
+    /// <summary>
+    /// Different units of measurement.
+    /// </summary>
+    public enum Unit
+    {
+        Foot,
+        Meters
+    }
+}