Using PredicateBuilder return NotSupportedException [BUG]

Version 5.0.9 Code to Reproduce For simplicity:

• I use a very simple query to describe the issue
• I’m using LINQPad,

void Main()
{
	var cs = new ConnectionString
	{
		Filename = @"c:\mydb.db",
		Password = @"MyP@55w0rd"
	};
	using (var db = new LiteDatabase(cs))
	{
		var col = db.GetCollection<Product>("Prods");
		col.Insert(new Product{ Name="AAA"});
		col.Insert(new Product{ Name="AEE"});

		var predicate = PredicateBuilder.False<Product>();

		predicate = predicate.Or(p => p.Name.Contains("A"));
		col.Find(predicate).Count().Dump(); //<== NotSupportedException 
	}
}
public class Product
{
	public int Id{get;set;}
	public string Name{get;set;}
}

Expected behavior The Count method should return the number of documents

Stacktrace

at LiteDB.LinqExpressionVisitor.Resolve(Boolean predicate)   
at LiteDB.BsonMapper.GetExpression[T,K](Expression`1 predicate)   
at LiteDB.LiteCollection`1.Find(Expression`1 predicate, Int32 skip, Int32 limit)   
at UserQuery.Main(), line 20

Exception Message

Invalid BsonExpression when converted from Linq expression: f => (False OrElse Invoke(p => p.Name.Contains("A"), f)) - `(((@p0) = true) OR @.Name LIKE ('%' + @p1 + '%')$)`

LiteException

Unexpected token `$` in position 49. 

Any help would be greatly appreciated.

[lbnascimento]

@toumir This issue has been fixed in the master and its fix will be present in the next incremental release. In the meantime, I suggest you use the ILiteQueryable<T> interface from col.Query(), for which I gave an example in my previous comment.

[djarvis]

I’m also looking for a fix for this. I have so very much code using PredicateBuilder that I really don’t want to rewrite, plus I am unsure how I can substitute col.Query() for every single instance (queries with dynamic and complex and’s and or’s, using predicates with DeleteMany(), etc.).

@lbnascimento Am I missing some documentation page on how to use Query()? I can’t find anything.