@last element in nested each refers to the parent item ( C# )

[ip75]

I try to dump array with objects to csv file. Each object is a row with values.

{{#unless @last}};{{/unless}} block in nested loop is interpreted as a last parent element.

There is a code for LinqPad:

void Main()
{
	string template = "{{#each header}}{{this}}{{#unless @last}};{{/unless}}{{/each}}\n{{#each rows}}{{#each this}}{{this}}{{#unless @last}};{{/unless}}{{/each}}\n{{/each}}\n\n\n\n\n\n";			
			
			var data = new
            {
                header = new string [] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
                rows = new item [] { new item(), new item(), new item(), new item(), new item(), new item(), new item() }
				
			};

	var handlebarsInstance = Handlebars.Create(new HandlebarsConfiguration {TextEncoder = new CsvEncoder()});
	Console.WriteLine(handlebarsInstance.Compile(template).Invoke(data));
}

public class CsvEncoder : ITextEncoder
{
    public string Encode(string value)
    {
        return value;
    }
}

public class item
{
	public string val1 {get; set;} = "A";
	public string val2 {get; set;} = "B";
	public string val3 {get; set;} = "C";
	public string val4 {get; set;} = "D";
	public string val5 {get; set;} = "E";
	public string val6 {get; set;} = "F";
	public string val7 {get; set;} = "G";
}

result is:

Sun;Mon;Tue;Wed;Thu;Fri;Sat
A;B;C;D;E;F;G;
A;B;C;D;E;F;G;
A;B;C;D;E;F;G;
A;B;C;D;E;F;G;
A;B;C;D;E;F;G;
A;B;C;D;E;F;G;
ABCDEFG

I expect this result:

Sun;Mon;Tue;Wed;Thu;Fri;Sat
A;B;C;D;E;F;G
A;B;C;D;E;F;G
A;B;C;D;E;F;G
A;B;C;D;E;F;G
A;B;C;D;E;F;G
A;B;C;D;E;F;G
A;B;C;D;E;F;G

Is this error in my handlebars template or bug in handlebars parser/composer for .net?

https://stackoverflow.com/questions/48424658/last-element-in-nested-each-handlebars-c-sharp

[slahn]

In Handlebars.js, @last is not set when iterating an object. As the documentation says: "When iterating over an object only the @FIRST is available."

If the data is an array (or list), this works as expected.

var rowData = new [] {"A","B","C","D","E","F","G"};	
var data = new
{
	header = new string[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
	rows = Enumerable.Repeat(rowData, 7)
}

Maybe @last should be explicitly unset somehow, instead of having the parent value? So that it was always false? But that wouldn't solve the authors problem anyway.

[oformaniuk]

Bug is located in Iterate method: https://github.com/rexm/Handlebars.Net/blob/a37a08b28469feec565304e27dabac64c554ff51/source/Handlebars/Compiler/Translation/Expression/IteratorBinder.cs#L239
I'd try to find some time and create a PR.