EF Core 2.2 - Невозможно проецировать при использовании IQueryable - PullRequest
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EF Core 2.2 - Невозможно проецировать при использовании IQueryable

0 голосов
/ 09 мая 2020

Это метод в моем общем репозитории c: 

 public async Task<TEntity> GetByCondition(Expression<Func<TEntity, bool>> predicate, Func<DbSet<TEntity>, IQueryable<TEntity>> baseQuery = null)
        {
            IQueryable<TEntity> q = _context.Set<TEntity>();

            if (baseQuery != null)
            {
                q = baseQuery(_context.Set<TEntity>());
            }

            return await q.Where(predicate).FirstOrDefaultAsync();
        }

Это используется в моем бизнес-журнале c: 

 Expression<Func<Countries, bool>> whereExpr = x => x.SlugHebrew == slug || x.SlugEnglish == slug || x.SlugSpanish == slug;

            IQueryable<Countries> BaseQuery(DbSet<Countries> x) => x.Include(z => z.Cities).ThenInclude(b => b.Businesses).ThenInclude(ca => ca.Category)
                                                                    .Include(z => z.Cities).ThenInclude(b => b.Businesses).ThenInclude(bd => bd.BusinessDetails)
                                                                    .Include(z => z.Facts)
                                                                    .Include(z => z.Cities).ThenInclude(a => a.Attractions).ThenInclude(ad => ad.AttractionDetails)
                                                                    .Include(z => z.Cities).ThenInclude(c => c.HotPlaces)
                                                                    .Include(z => z.Cities).ThenInclude(z => z.CityImages).ThenInclude(z => z.Image).ThenInclude(z => z.InverseParent)
                                                                    .Include(z => z.CountryImages).ThenInclude(z => z.Image.InverseParent)
                                                                    .Select(c=> new Countries
                                                                    {
                                                                        CountryImages = c.CountryImages.Where(ci => ci.Image.ParentId == null && ci.Status == (int)EnumGringo.LU_Status.active)
                                                                            .ToList()
                                                                    });


            Countries country = await _countryRepository.GetByCondition(whereExpr, BaseQuery);

Без проекции он работает , но с ним я получаю эту ошибку: 

ArgumentException: Expression of type 'System.Collections.Generic.IAsyncEnumerable`1[DAL.Models.CountryImages]' cannot be used for parameter of type 'System.Collections.Generic.IEnumerable`1[DAL.Models.CountryImages]' of method 'System.Collections.Generic.List`1[DAL.Models.CountryImages] ToList[CountryImages](System.Collections.Generic.IEnumerable`1[DAL.Models.CountryImages])'
Parameter name: arg0
System.Dynamic.Utils.ExpressionUtils.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arguments, ParameterInfo pi, string methodParamName, string argumentParamName, int index)

Это модель домена для объекта стран: 

public partial class Countries
    {
        public Countries()
        {
            CountryImages = new HashSet<CountryImages>();
        }

        public int Id { get; set; }

        public virtual ICollection<CountryImages> CountryImages { get; set; }

    }

И модель CountryImages: 

public partial class CountryImages
{
    public int Id { get; set; }
    public int CountryId { get; set; }
    public int ImageId { get; set; }

    public virtual Countries Country { get; set; }
    public virtual UserImages Image { get; set; }
}
...