Error on nested model

[masoodinfo]

i use .net core 7.0.14 & last version of gridify
i write maper :

var maper=new gridifymapper<Post>(true);
maper.addmap("categori",x=>x.postincategories.select(y=>y.categori.onvan);

var rec=_db.Posts.asnotracking().include(x=>x.postincategoris).theninclude(x=>x.categori).gridify(new gridifyquery(1,10,"categori=*روزنامه",""),maper);

i need : 
var rec=_db.posts.where(x=>x.postincategoris.any(y=>y.categori.onvan.contains("روزنامه")));

error :
System.ArgumentException: Expression of type 'System.String' cannot be used for return type 'System.Boolean'
at System.Linq.Expressions.Expression.ValidateLambdaArgs(Type delegateType, Expression& body, ReadOnlyCollection1 parameters, String paramName) at System.Linq.Expressions.Expression.Lambda[TDelegate](Expression body, String name, Boolean tailCall, IEnumerable1 parameters)
at System.Linq.Expressions.Expression.Lambda[TDelegate](Expression body, Boolean tailCall, IEnumerable1 parameters) at Gridify.QueryBuilders.LinqQueryBuilder1.GenerateNestedExpression(Expression body, IGMap1 gMap, ValueExpressionSyntax value, SyntaxNode op) at Gridify.QueryBuilders.LinqQueryBuilder1.BuildNestedQuery(Expression body, IGMap1 gMap, ValueExpressionSyntax value, SyntaxNode op) at Gridify.QueryBuilders.BaseQueryBuilder2.ConvertBinaryExpressionSyntaxToQuery(BinaryExpressionSyntax binarySyntax)
at Gridify.QueryBuilders.BaseQueryBuilder2.BuildQuery(ExpressionSyntax expression, Boolean isParenthesisOpen) at Gridify.QueryBuilders.BaseQueryBuilder2.Build(ExpressionSyntax expression)
at Gridify.GridifyExtensions.ApplyFiltering[T](IQueryable1 query, String filter, IGridifyMapper1 mapper)
at Gridify.GridifyExtensions.ApplyFiltering[T](IQueryable1 query, IGridifyFiltering gridifyFiltering, IGridifyMapper1 mapper)
at Gridify.GridifyExtensions.GridifyQueryable[T](IQueryable1 query, IGridifyQuery gridifyQuery, IGridifyMapper1 mapper)
at Gridify.GridifyExtensions.Gridify[T](IQueryable1 query, IGridifyQuery gridifyQuery, IGridifyMapper1 mapper)

[alirezanet]

Hi @masoodinfo,

Can you also share your models?

if it is something like this it should work out of the box!

var maper = new GridifyMapper<Post>(true);
maper.AddMap("categori", q => q.PostInCategories.Select(q => q.Category.Onvan ));

var query = new GridifyQuery(1, 10, "categori=*روزنامه", "");

var expression = query.GetFilteringExpression(maper);

// expression: q => ((q.PostInCategories != null) AndAlso q.PostInCategories.Any(q => q.Category.Onvan.Contains("روزنامه")))

public class Post
{
   public List<PostInCategories> PostInCategories {get;set;}
}

public class PostInCategories
{
	 public Category Category {get;set;}
}

public class Category
{
	public string Onvan {get;set;}
}

[masoodinfo]

Hi Alireza . tnx for answer

my model is equal to your write
i found my problem
in other project ( .net 4.8 ) i write condition on maper like

maper.addmap("categori",x=>x.postincategories ==null ? "" :x.postincategories.select(...));

i think in this version work but not true.

tnx a lot