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Added session 3
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‎README.md

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@@ -30,7 +30,7 @@ The GraphQL schema can be found [here](code/complete/schema.graphql).
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|------------------------------------------------------------|-------------------------------------------------------|
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| [Session #1](docs/1-creating-a-graphql-server-project.md) | Creating a new GraphQL server project. |
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| [Session #2](docs/2-controlling-nullability.md) | Controlling nullability. |
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| [Session #3](docs/3-understanding-dataLoader.md) | Understanding GraphQL query execution and DataLoader. |
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| [Session #3](docs/3-understanding-data-loader.md) | Understanding DataLoader. |
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| [Session #4](docs/4-schema-design.md) | GraphQL schema design approaches. |
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| [Session #5](docs/5-understanding-middleware.md) | Understanding middleware. |
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| [Session #6](docs/6-adding-complex-filter-capabilities.md) | Adding complex filter capabilities. |

‎code/session-3/.config/dotnet-tools.json

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@@ -3,10 +3,11 @@
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"isRoot": true,
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"tools": {
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"dotnet-ef": {
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"version": "5.0.0",
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"version": "8.0.7",
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"commands": [
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"dotnet-ef"
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]
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],
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"rollForward": false
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}
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}
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}

‎code/session-3/.vscode/launch.json

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‎code/session-3/.vscode/tasks.json

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‎code/session-3/ConferencePlanner.sln

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@@ -1,34 +1,22 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26124.0
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MinimumVisualStudioVersion = 15.0.26124.0
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GraphQL", "GraphQL\GraphQL.csproj", "{48385280-56F1-4937-9655-E6A79184740B}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|x64.ActiveCfg = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|x64.Build.0 = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|x86.ActiveCfg = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Debug|x86.Build.0 = Debug|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|Any CPU.Build.0 = Release|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|x64.ActiveCfg = Release|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|x64.Build.0 = Release|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|x86.ActiveCfg = Release|Any CPU
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{48385280-56F1-4937-9655-E6A79184740B}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31903.59
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GraphQL", "GraphQL\GraphQL.csproj", "{D96823B9-86D3-4D54-A803-F1D43AEBE1FD}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{D96823B9-86D3-4D54-A803-F1D43AEBE1FD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{D96823B9-86D3-4D54-A803-F1D43AEBE1FD}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{D96823B9-86D3-4D54-A803-F1D43AEBE1FD}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{D96823B9-86D3-4D54-A803-F1D43AEBE1FD}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎code/session-3/GraphQL/AddSpeakerInput.cs

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@@ -1,7 +1,6 @@
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namespace ConferencePlanner.GraphQL
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{
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public record AddSpeakerInput(
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string Name,
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string? Bio,
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string? WebSite);
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}
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namespace ConferencePlanner.GraphQL;
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public sealed record AddSpeakerInput(
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string Name,
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string? Bio,
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string? Website);

‎code/session-3/GraphQL/AddSpeakerPayload.cs

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@@ -1,14 +1,8 @@
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using ConferencePlanner.GraphQL.Data;
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namespace ConferencePlanner.GraphQL
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{
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public class AddSpeakerPayload
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{
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public AddSpeakerPayload(Speaker speaker)
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{
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Speaker = speaker;
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}
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namespace ConferencePlanner.GraphQL;
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public Speaker Speaker { get; }
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}
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}
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public sealed class AddSpeakerPayload(Speaker speaker)
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{
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public Speaker Speaker { get; } = speaker;
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}

‎code/session-3/GraphQL/Data/ApplicationDbContext.cs

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using Microsoft.EntityFrameworkCore;
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namespace ConferencePlanner.GraphQL.Data
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{
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public class ApplicationDbContext : DbContext
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{
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public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
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: base(options)
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{
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}
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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modelBuilder
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.Entity<Attendee>()
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.HasIndex(a => a.UserName)
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.IsUnique();
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// Many-to-many: Session <-> Attendee
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modelBuilder
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.Entity<SessionAttendee>()
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.HasKey(ca => new { ca.SessionId, ca.AttendeeId });
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// Many-to-many: Speaker <-> Session
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modelBuilder
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.Entity<SessionSpeaker>()
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.HasKey(ss => new { ss.SessionId, ss.SpeakerId });
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}
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public DbSet<Session> Sessions { get; set; } = default!;
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public DbSet<Track> Tracks { get; set; } = default!;
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public DbSet<Speaker> Speakers { get; set; } = default!;
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public DbSet<Attendee> Attendees { get; set; } = default!;
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}
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}
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using Microsoft.EntityFrameworkCore;
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namespace ConferencePlanner.GraphQL.Data;
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public sealed class ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
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: DbContext(options)
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{
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public DbSet<Attendee> Attendees { get; set; }
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public DbSet<Session> Sessions { get; set; }
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public DbSet<Speaker> Speakers { get; set; }
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public DbSet<Track> Tracks { get; set; } = default!;
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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modelBuilder
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.Entity<Attendee>()
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.HasIndex(a => a.Username)
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.IsUnique();
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// Many-to-many: Session <-> Attendee
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modelBuilder
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.Entity<SessionAttendee>()
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.HasKey(sa => new { sa.SessionId, sa.AttendeeId });
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// Many-to-many: Speaker <-> Session
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modelBuilder
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.Entity<SessionSpeaker>()
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.HasKey(ss => new { ss.SessionId, ss.SpeakerId });
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}
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}

‎code/session-3/GraphQL/Data/Attendee.cs

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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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namespace ConferencePlanner.GraphQL.Data
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namespace ConferencePlanner.GraphQL.Data;
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public sealed class Attendee
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{
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public class Attendee
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{
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public int Id { get; set; }
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public int Id { get; set; }
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[Required]
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[StringLength(200)]
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public string? FirstName { get; set; }
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[StringLength(200)]
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public required string FirstName { get; set; }
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[Required]
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[StringLength(200)]
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public string? LastName { get; set; }
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[StringLength(200)]
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public required string LastName { get; set; }
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[Required]
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[StringLength(200)]
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public string? UserName { get; set; }
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[StringLength(200)]
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public required string Username { get; set; }
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[StringLength(256)]
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public string? EmailAddress { get; set; }
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[StringLength(256)]
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public string? EmailAddress { get; set; }
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public ICollection<SessionAttendee> SessionsAttendees { get; set; } =
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new List<SessionAttendee>();
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}
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}
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public ICollection<SessionAttendee> SessionsAttendees { get; set; } =
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new List<SessionAttendee>();
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}

‎code/session-3/GraphQL/Data/Session.cs

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using System;
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using System.Collections.Generic;
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using System.ComponentModel.DataAnnotations;
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namespace ConferencePlanner.GraphQL.Data
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namespace ConferencePlanner.GraphQL.Data;
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public sealed class Session
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{
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public class Session
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{
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public int Id { get; set; }
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public int Id { get; set; }
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[Required]
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[StringLength(200)]
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public string? Title { get; set; }
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[StringLength(200)]
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public required string Title { get; set; }
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[StringLength(4000)]
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public string? Abstract { get; set; }
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[StringLength(4000)]
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public string? Abstract { get; set; }
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public DateTimeOffset? StartTime { get; set; }
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public DateTimeOffset? StartTime { get; set; }
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public DateTimeOffset? EndTime { get; set; }
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public DateTimeOffset? EndTime { get; set; }
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// Bonus points to those who can figure out why this is written this way
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public TimeSpan Duration =>
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EndTime?.Subtract(StartTime ?? EndTime ?? DateTimeOffset.MinValue) ??
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TimeSpan.Zero;
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// Bonus points to those who can figure out why this is written this way.
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public TimeSpan Duration =>
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EndTime?.Subtract(StartTime ?? EndTime ?? DateTimeOffset.MinValue) ??
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TimeSpan.Zero;
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public int? TrackId { get; set; }
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public int? TrackId { get; set; }
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public ICollection<SessionSpeaker> SessionSpeakers { get; set; } =
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new List<SessionSpeaker>();
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public ICollection<SessionSpeaker> SessionSpeakers { get; set; } =
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new List<SessionSpeaker>();
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public ICollection<SessionAttendee> SessionAttendees { get; set; } =
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new List<SessionAttendee>();
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public ICollection<SessionAttendee> SessionAttendees { get; set; } =
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new List<SessionAttendee>();
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public Track? Track { get; set; }
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}
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}
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public Track? Track { get; set; }
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}

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