WebApi + ClientApp, GraphQL, Reflection

Events-WebApi/Events.WebAPI.Handlers.EF/QueryHandlers/CountriesLookupQueryHandler.cs

@@ -0,0 +1,37 @@
+using Events.WebAPI.Contract.DTOs;
+using Events.WebAPI.Contract.LookupQueries;
+using Events.WebAPI.Handlers.EF.Data.Postgres;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Events.WebAPI.Handlers.EF.QueryHandlers;
+
+public class CountriesLookupQueryHandler : IRequestHandler<LookupCountryQuery, List<IdName<string>>>
+{
+  private readonly EventsContext ctx;
+
+  public CountriesLookupQueryHandler(EventsContext ctx)
+  {
+    this.ctx = ctx;
+  }
+
+  public async Task<List<IdName<string>>> Handle(LookupCountryQuery request, CancellationToken cancellationToken)
+  {
+    var query = ctx.Countries.AsNoTracking();
+
+    if (!string.IsNullOrWhiteSpace(request.Text))
+    {
+      string text = request.Text.Trim();
+      query = query.Where(c => Microsoft.EntityFrameworkCore.EF.Functions.ILike(c.Name, $"%{text}%"));
+    }
+
+    return await query
+      .OrderBy(c => c.Name)
+      .Select(c => new IdName<string>
+      {
+        Id = c.Code,
+        Name = c.Name
+      })
+      .ToListAsync(cancellationToken);
+  }
+}