feat: add a faculty command

Application/Cqrs/Faculty/Commands/CreateFaculty/CreateFacultyCommand.cs

@@ -0,0 +1,9 @@
+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Commands.CreateFaculty;
+
+public class CreateFacultyCommand : IRequest<int>
+{
+    public required string Name { get; set; }
+    public int? CampusId { get; set; }
+}

Application/Cqrs/Faculty/Commands/CreateFaculty/CreateFacultyCommandHandler.cs

@@ -0,0 +1,30 @@
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Common.Exceptions;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Commands.CreateFaculty;
+
+public class CreateFacultyCommandHandler(IFacultyDbContext dbContext) : IRequestHandler<CreateFacultyCommand, int>
+{
+    public async Task<int> Handle(CreateFacultyCommand request, CancellationToken cancellationToken)
+    {
+        var entity = await dbContext.Faculties.FirstOrDefaultAsync(f => f.Name == request.Name, cancellationToken: cancellationToken);
+
+        if (entity != null)
+            throw new RecordExistException(typeof(Domain.Schedule.Faculty), nameof(Domain.Schedule.Faculty.Name), entity.Id);
+
+        var faculty = new Domain.Schedule.Faculty()
+        {
+            Name = request.Name,
+            CampusId = request.CampusId
+        };
+
+        var result = await dbContext.Faculties.AddAsync(faculty, cancellationToken);
+        await dbContext.SaveChangesAsync(cancellationToken);
+
+        return result.Entity.Id;
+    }
+}

Application/Cqrs/Faculty/Commands/UpdateFaculty/UpdateFacultyCommand.cs

@@ -0,0 +1,9 @@
+using MediatR;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Commands.UpdateFaculty;
+
+public class UpdateFacultyCommand : IRequest
+{
+    public required int Id { get; set; }
+    public required int CampusId { get; set; }
+}

Application/Cqrs/Faculty/Commands/UpdateFaculty/UpdateFacultyCommandHandler.cs

@@ -0,0 +1,20 @@
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Mirea.Api.DataAccess.Application.Common.Exceptions;
+using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Mirea.Api.DataAccess.Application.Cqrs.Faculty.Commands.UpdateFaculty;
+
+public class UpdateFacultyCommandHandler(IFacultyDbContext dbContext) : IRequestHandler<UpdateFacultyCommand>
+{
+    public async Task Handle(UpdateFacultyCommand request, CancellationToken cancellationToken)
+    {
+        var entity = await dbContext.Faculties.FirstOrDefaultAsync(f => f.Id == request.Id, cancellationToken: cancellationToken) ?? throw new NotFoundException(typeof(Domain.Schedule.Faculty), nameof(Domain.Schedule.Faculty.Id), request.Id);
+
+        entity.CampusId = request.CampusId;
+
+        await dbContext.SaveChangesAsync(cancellationToken);
+    }
+}