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Added session 6
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‎code/session-6/.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-6/.vscode/launch.json

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‎code/session-6/.vscode/tasks.json

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‎code/session-6/ConferencePlanner.sln

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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-6/GraphQL/Attendees/AttendeeDataLoaders.cs

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using ConferencePlanner.GraphQL.Data;
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using Microsoft.EntityFrameworkCore;
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namespace ConferencePlanner.GraphQL.Attendees;
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public static class AttendeeDataLoaders
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{
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[DataLoader]
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public static async Task<IReadOnlyDictionary<int, Attendee>> AttendeeByIdAsync(
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IReadOnlyList<int> ids,
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ApplicationDbContext dbContext,
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CancellationToken cancellationToken)
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{
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return await dbContext.Attendees
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.Where(a => ids.Contains(a.Id))
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.ToDictionaryAsync(a => a.Id, cancellationToken);
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}
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}

‎code/session-6/GraphQL/Attendees/AttendeeType.cs

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using ConferencePlanner.GraphQL.Data;
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using ConferencePlanner.GraphQL.Sessions;
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using Microsoft.EntityFrameworkCore;
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namespace ConferencePlanner.GraphQL.Attendees;
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[ObjectType<Attendee>]
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public static partial class AttendeeType
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{
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static partial void Configure(IObjectTypeDescriptor<Attendee> descriptor)
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{
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descriptor
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.ImplementsNode()
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.IdField(a => a.Id)
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.ResolveNode(
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async (ctx, id)
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=> await ctx.DataLoader<AttendeeByIdDataLoader>()
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.LoadAsync(id, ctx.RequestAborted));
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descriptor.Ignore(a => a.SessionsAttendees);
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}
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public static async Task<IEnumerable<Session>> GetSessionsAsync(
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[Parent] Attendee attendee,
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ApplicationDbContext dbContext,
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SessionByIdDataLoader sessionById,
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CancellationToken cancellationToken)
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{
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var sessionIds = await dbContext.Attendees
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.Where(a => a.Id == attendee.Id)
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.Include(a => a.SessionsAttendees)
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.SelectMany(a => a.SessionsAttendees.Select(sa => sa.SessionId))
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.ToArrayAsync(cancellationToken);
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return await sessionById.LoadAsync(sessionIds, cancellationToken);
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}
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}

‎code/session-6/GraphQL/Common/Payload.cs

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‎code/session-6/GraphQL/Common/UserError.cs

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‎code/session-6/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-6/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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5+
public sealed class Attendee
56
{
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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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22-
[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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25-
public ICollection<SessionAttendee> SessionsAttendees { get; set; } =
26-
new List<SessionAttendee>();
27-
}
28-
}
21+
public ICollection<SessionAttendee> SessionsAttendees { get; set; } =
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new List<SessionAttendee>();
23+
}

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