RhSolutions-Api/RhSolutions.Api/Controllers/SearchController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RhSolutions.Models;

namespace RhSolutions.Api.Controllers
{
	[Route("api/[controller]")]
	public class SearchController : ControllerBase
	{
		private RhSolutionsContext context;

		public SearchController(RhSolutionsContext context)
		{
			this.context = context;
		}

		[HttpGet]
		public IAsyncEnumerable<Product> SearchProducts([FromQuery] string query)
		{
			return context.Products
				.Where(p => EF.Functions.ToTsVector(
					"russian", string.Join(' ', new[] { p.Name, string.Join(' ', p.ProductLines)}))
					.Matches(EF.Functions.WebSearchToTsQuery("russian", query)))
				.OrderByDescending(p => p.IsOnWarehouse)
				.AsAsyncEnumerable();
		}
	}
}