books/backend/Books.Api/EventFlow/ReadModels/CompanyReadModel.cs

using System.ComponentModel.DataAnnotations.Schema;
using Books.Api.Domain.Companies;
using Books.Api.Domain.Companies.Events;
using EventFlow.Aggregates;
using EventFlow.PostgreSql.ReadStores.Attributes;
using EventFlow.ReadStores;

namespace Books.Api.EventFlow.ReadModels;

[Table("company_read_models")]
public class CompanyReadModel : IReadModel,
    IAmReadModelFor<CompanyAggregate, CompanyId, CompanyCreatedEvent>,
    IAmReadModelFor<CompanyAggregate, CompanyId, CompanyUpdatedEvent>
{
    // EventFlow standard columns
    [PostgreSqlReadModelIdentityColumn]
    public string AggregateId { get; set; } = string.Empty;

    public DateTimeOffset CreateTime { get; set; }
    public DateTimeOffset UpdatedTime { get; set; }

    [PostgreSqlReadModelVersionColumn]
    public int LastAggregateSequenceNumber { get; set; }

    // Business columns
    public string Name { get; set; } = string.Empty;
    public string? Cvr { get; set; }
    public string? Address { get; set; }
    public string? PostalCode { get; set; }
    public string? City { get; set; }
    public string Country { get; set; } = "DK";
    public int FiscalYearStartMonth { get; set; } = 1;
    public string Currency { get; set; } = "DKK";
    public bool VatRegistered { get; set; }
    public string? VatPeriodFrequency { get; set; }

    public Task ApplyAsync(
        IReadModelContext context,
        IDomainEvent<CompanyAggregate, CompanyId, CompanyCreatedEvent> domainEvent,
        CancellationToken cancellationToken)
    {
        var e = domainEvent.AggregateEvent;
        AggregateId = domainEvent.AggregateIdentity.Value;
        CreateTime = domainEvent.Timestamp;
        UpdatedTime = domainEvent.Timestamp;
        LastAggregateSequenceNumber = (int)domainEvent.AggregateSequenceNumber;
        Name = e.Name;
        Cvr = e.Cvr;
        Address = e.Address;
        PostalCode = e.PostalCode;
        City = e.City;
        Country = e.Country;
        FiscalYearStartMonth = e.FiscalYearStartMonth;
        Currency = e.Currency;
        VatRegistered = e.VatRegistered;
        VatPeriodFrequency = e.VatPeriodFrequency;
        return Task.CompletedTask;
    }

    public Task ApplyAsync(
        IReadModelContext context,
        IDomainEvent<CompanyAggregate, CompanyId, CompanyUpdatedEvent> domainEvent,
        CancellationToken cancellationToken)
    {
        var e = domainEvent.AggregateEvent;
        UpdatedTime = domainEvent.Timestamp;
        LastAggregateSequenceNumber = (int)domainEvent.AggregateSequenceNumber;
        Name = e.Name;
        Cvr = e.Cvr;
        Address = e.Address;
        PostalCode = e.PostalCode;
        City = e.City;
        Country = e.Country;
        FiscalYearStartMonth = e.FiscalYearStartMonth;
        Currency = e.Currency;
        VatRegistered = e.VatRegistered;
        VatPeriodFrequency = e.VatPeriodFrequency;
        return Task.CompletedTask;
    }
}