novelly/src/Novelly.Api/Beats/Beat.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Novelly.Api.Chapters;
using Novelly.Api.Characters;
using Novelly.Api.Tags;

namespace Novelly.Api.Beats;

public class Beat
{
    public Guid Id { get; set; } = Guid.NewGuid();

    public Guid ChapterId { get; set; }
    public Chapter? Chapter { get; set; }

    public int SortOrder { get; set; }

    public string Title { get; set; } = string.Empty;

    public List<Character> Characters { get; set; } = [];

    public string? WhatHappened { get; set; }

    public string? WhatsNext { get; set; }

    public List<Tag> Tags { get; set; } = [];

    public DateTimeOffset CreatedAt { get; set; } = DateTimeOffset.UtcNow;
    public DateTimeOffset UpdatedAt { get; set; } = DateTimeOffset.UtcNow;
}

public class BeatEntityTypeConfiguration : IEntityTypeConfiguration<Beat>
{
    public void Configure(EntityTypeBuilder<Beat> entity)
    {
        entity.Property(b => b.Title).IsRequired().HasMaxLength(200);
        entity.HasIndex(b => new { b.ChapterId, b.SortOrder });

        entity.HasOne(b => b.Chapter).WithMany(c => c.Beats)
            .HasForeignKey(b => b.ChapterId).OnDelete(DeleteBehavior.Cascade);

        entity.HasMany(b => b.Characters).WithMany(c => c.Beats)
            .UsingEntity(join => join.ToTable("BeatCharacters"));
    }
}