initial commit

Core/Application/Features/ExpenseManager/Queries/GetExpenseSingle.cs

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+using Application.Common.CQS.Queries;
+using AutoMapper;
+using Domain.Entities;
+using FluentValidation;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Application.Features.ExpenseManager.Queries;
+
+public class GetExpenseSingleProfile : Profile
+{
+    public GetExpenseSingleProfile()
+    {
+    }
+}
+
+public class GetExpenseSingleResult
+{
+    public Expense? Data { get; init; }
+}
+
+public class GetExpenseSingleRequest : IRequest<GetExpenseSingleResult>
+{
+    public string? Id { get; init; }
+}
+
+public class GetExpenseSingleValidator : AbstractValidator<GetExpenseSingleRequest>
+{
+    public GetExpenseSingleValidator()
+    {
+        RuleFor(x => x.Id).NotEmpty();
+    }
+}
+
+public class GetExpenseSingleHandler : IRequestHandler<GetExpenseSingleRequest, GetExpenseSingleResult>
+{
+    private readonly IQueryContext _context;
+
+    public GetExpenseSingleHandler(
+        IQueryContext context
+    )
+    {
+        _context = context;
+    }
+
+    public async Task<GetExpenseSingleResult> Handle(GetExpenseSingleRequest request, CancellationToken cancellationToken)
+    {
+        var query = _context
+            .Expense
+            .AsNoTracking()
+            .Include(x => x.Campaign)
+            .Where(x => x.Id == request.Id)
+            .AsQueryable();
+
+        var entity = await query.SingleOrDefaultAsync(cancellationToken);
+
+        return new GetExpenseSingleResult
+        {
+            Data = entity
+        };
+    }
+}