Problem with deserialization of lists with Find GetResult

Petr Kriz

Vote:

Hello,

I'm trying to deserialize an index of our Product object and it crashes on lists. Here is my code:

                var query = _client.Search<Product>().For("product1");
                var result = query.Select(x => new { m = x.MarketFilter }).GetResult();

The thrown exception reads "'To deserialize objects the $type property must be set." There is no $type property in the Index, should I force it somehow?

    "MarketFilter": [
        "DEFAULT",
        "FRMARKET",
        ...
    ],

It's not possible for any list but MarketFilter is a native property so I thought it should work at least with that.

Thanks.

Epi CMS: 11.21.2
Epi commerce: 13.32.1
EPiServer.Find: 13.4.8.0

#318950

Mar 14, 2024 11:34

Paul McGann (Netcel)

Vote:

Hi Petr,

What happens if you had

    var result = query.Select(x => new { m = x.MarketFilter.ToList() }).GetResult();

#318953

Mar 14, 2024 12:17

Petr Kriz

Vote:

Hi Paul,

although the type is changed from ItemCollection<string> to List<string>, the Exception stays the same.

#318954

Edited, Mar 14, 2024 12:44

Paul McGann (Netcel) - Mar 14, 2024 17:13

Yeah I think that is because the items under the hood is an IList. Thought trying the ToList might have got around it.

Quan Mai

Vote:

You probably want to do this instead

var query = _client.Search<Product>().For("product1");
                var result = query.Select(x => new { m = x.Markets() }).GetResult();

Markets is an extension that is the opposite of MarketFilter (which means the markets the product is excluded in)

#318963

Mar 14, 2024 15:55

Mark Stott

Vote:

While not specific to the markets example above. If you want to use projections from TypeSearch with a collection property, then you should ensure the property is declared as IEnumerable<T>. I've had allsorts of issues with IList<T> and List<T> where they did not serialize back or caused errors. It only started working for me when I declared the property being indexed as IEnumerable

e.g.

public class MyPage
{
  [Searchable]
  public IEnumerable<ChildModel> Children => GetChildren();

  private List<ChildModel> GetChildren()
  {
     // Logic here to return a List<ChildModel>
  }
}

#319134

Mar 18, 2024 14:46

Quan Mai

Vote:

Thinking out loud but that would be very strange to be honest. Json can't be serialized to a deferred iterator, it has to serialize to a concrete class (in this case, a List, or an array). I have no idea why it has problem deserializing to a List however ...

#319136

Mar 18, 2024 14:55

Petr Kriz

Vote:

That was it! When I changed IList to IEnumerable in my Epi model, it started working. Thanks!

public class Product : ProductContent {

        [Display(
           Name = "Product type list",
           GroupName = GroupNames.MetaData,
           Order = 15)]
        [BackingType(typeof(PropertyStringList))]
        public virtual IEnumerable<String> ProductTypeList { get; set; }

}

#319253

Edited, Mar 20, 2024 14:09