tiku-backend.net/Tiku.Infrastructure/Persistence/TikuDbContext.cs

using Microsoft.EntityFrameworkCore;
using Tiku.Domain.Catalog;
using Tiku.Domain.Common;
using Tiku.Domain.Content;
using Tiku.Domain.Identity;
using Tiku.Domain.Learning;
using Tiku.Domain.QuestionBanks;
using Tiku.Domain.Tenancy;

namespace Tiku.Infrastructure.Persistence;

public sealed class TikuDbContext(DbContextOptions<TikuDbContext> options) : DbContext(options)
{
    public DbSet<Tenant> Tenants => Set<Tenant>();
    public DbSet<User> Users => Set<User>();
    public DbSet<UserIdentity> UserIdentities => Set<UserIdentity>();
    public DbSet<TenantMembership> TenantMemberships => Set<TenantMembership>();
    public DbSet<TenantDomain> TenantDomains => Set<TenantDomain>();
    public DbSet<TenantBranding> TenantBrandings => Set<TenantBranding>();
    public DbSet<TenantSettings> TenantSettings => Set<TenantSettings>();
    public DbSet<StudentProfile> StudentProfiles => Set<StudentProfile>();
    public DbSet<Region> Regions => Set<Region>();
    public DbSet<RegionModule> RegionModules => Set<RegionModule>();
    public DbSet<ModuleNode> ModuleNodes => Set<ModuleNode>();
    public DbSet<School> Schools => Set<School>();
    public DbSet<Major> Majors => Set<Major>();
    public DbSet<Subject> Subjects => Set<Subject>();
    public DbSet<Category> Categories => Set<Category>();
    public DbSet<QuestionBank> QuestionBanks => Set<QuestionBank>();
    public DbSet<Question> Questions => Set<Question>();
    public DbSet<QuestionVersion> QuestionVersions => Set<QuestionVersion>();
    public DbSet<ContentEntry> ContentEntries => Set<ContentEntry>();
    public DbSet<ContentNode> ContentNodes => Set<ContentNode>();
    public DbSet<QuestionCollection> QuestionCollections => Set<QuestionCollection>();
    public DbSet<QuestionCollectionItem> QuestionCollectionItems => Set<QuestionCollectionItem>();
    public DbSet<PracticeBlueprint> PracticeBlueprints => Set<PracticeBlueprint>();
    public DbSet<VocabularyUnit> VocabularyUnits => Set<VocabularyUnit>();
    public DbSet<VocabularyWord> VocabularyWords => Set<VocabularyWord>();
    public DbSet<UserWordProgress> UserWordProgress => Set<UserWordProgress>();
    public DbSet<UserWordFavorite> UserWordFavorites => Set<UserWordFavorite>();
    public DbSet<HandbookSubject> HandbookSubjects => Set<HandbookSubject>();
    public DbSet<HandbookChapter> HandbookChapters => Set<HandbookChapter>();
    public DbSet<HandbookEntry> HandbookEntries => Set<HandbookEntry>();
    public DbSet<QuestionTypeGroup> QuestionTypeGroups => Set<QuestionTypeGroup>();
    public DbSet<SubjectShare> SubjectShares => Set<SubjectShare>();
    public DbSet<ContentAsset> ContentAssets => Set<ContentAsset>();
    public DbSet<ContentImportJob> ContentImportJobs => Set<ContentImportJob>();
    public DbSet<ContentImportItem> ContentImportItems => Set<ContentImportItem>();
    public DbSet<ContentImportIssue> ContentImportIssues => Set<ContentImportIssue>();
    public DbSet<ImageAsset> Images => Set<ImageAsset>();
    public DbSet<AppAsset> AppAssets => Set<AppAsset>();
    public DbSet<VideoExplanation> VideoExplanations => Set<VideoExplanation>();
    public DbSet<QuestionVideo> QuestionVideos => Set<QuestionVideo>();
    public DbSet<PracticeSession> PracticeSessions => Set<PracticeSession>();
    public DbSet<AnswerRecord> AnswerRecords => Set<AnswerRecord>();
    public DbSet<FavoriteQuestion> FavoriteQuestions => Set<FavoriteQuestion>();
    public DbSet<WrongQuestion> WrongQuestions => Set<WrongQuestion>();
    public DbSet<RecentPractice> RecentPractices => Set<RecentPractice>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.HasPostgresExtension("citext");
        modelBuilder.HasPostgresExtension("ltree");
        modelBuilder.ApplyConfigurationsFromAssembly(typeof(TikuDbContext).Assembly);
        modelBuilder.UseSnakeCaseIdentifiers();
    }

    public override int SaveChanges(bool acceptAllChangesOnSuccess)
    {
        UpdateTimestamps();
        return base.SaveChanges(acceptAllChangesOnSuccess);
    }

    public override Task<int> SaveChangesAsync(
        bool acceptAllChangesOnSuccess,
        CancellationToken cancellationToken = default)
    {
        UpdateTimestamps();
        return base.SaveChangesAsync(acceptAllChangesOnSuccess, cancellationToken);
    }

    private void UpdateTimestamps()
    {
        var now = DateTimeOffset.UtcNow;

        foreach (var entry in ChangeTracker.Entries<IHasTimestamps>())
        {
            if (entry.State == EntityState.Added)
            {
                entry.Entity.CreatedAt = now;
            }

            if (entry.State is EntityState.Added or EntityState.Modified)
            {
                entry.Entity.UpdatedAt = now;
            }
        }
    }
}