var query = DbContext.Registries.AsNoTracking().ProjectTo<Registry>(Mapper.ConfigurationProvider);
    if (onlyMine) {
        query = from registry in DbContext.Registries.AsNoTracking()
                join member in DbContext.RegistryMembers.AsNoTracking() on registry.Id equals member.RegistryId into members
                from membership in members.DefaultIfEmpty()
                where onlyMine && membership.MemberId == userId
                select new Registry {
                    Id = registry.Id,
                    Customer = new Customer {
                        Id = registry.Customer.Id,
                        Name = registry.Customer.Name,
                    },
                    Title = registry.Title,
                    Membership = membership.Role
                };
    } else if (isVendor) {
        query = from registry in DbContext.Registries.AsNoTracking()
                join member in DbContext.RegistryMembers.AsNoTracking() on registry.Id equals member.RegistryId into members
                from membership in members.DefaultIfEmpty()
                select new Registry {
                    Id = registry.Id,
                    Customer = new Customer {
                        Id = registry.Customer.Id,
                        Name = registry.Customer.Name,
                    },
                    Title = registry.Title,
                    Membership = membership.Role
                };
    }
    if (!string.IsNullOrWhiteSpace(options.Search)) {
        var term = options.Search.Trim().ToLowerInvariant();
        query = query.Where(x => x.Title.ToLower().Contains(term) ||  x.Customer.Name.ToLower().Contains(term));
    }
    return await query.ToResultSetAsync(options);