It failed to use \seq_use:Nn or \clist_use:Nn inside tblr environment

[xkwxdyy]

Here are two MWE:

\documentclass{article}
\usepackage{tabularray}

\ExplSyntaxOn
\NewDocumentCommand{ \test }{ m }
  {
    \seq_set_from_clist:Nn \l_tmpa_seq {#1}
    \begin{tblr}{|c|c|c|c|c|c|c|c|c|c|c|c|}
    % \begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|}
      \hline
      1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12\\ \hline
      \seq_use:Nn \l_tmpa_seq {&} \\
      \hline
    \end{tblr}
    % \end{tabular}
  }
\ExplSyntaxOff
\begin{document}
\test{C,B,B,A,B,D,B,D,ABC,BD,CD,AB}

\end{document}

\documentclass{article}
\usepackage{tabularray}
\begin{document}
\ExplSyntaxOn
\NewDocumentCommand{ \test }{ m }
  {
    \clist_set:Nn \l_tmpa_clist {#1}   
    % \begin{tblr}{|c|c|c|c|c|c|c|c|c|c|c|c|}
    \begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|}
      \hline
      1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12\\ \hline
      \clist_use:Nn \l_tmpa_clist {&} \\
      \hline
    % \end{tblr}
    \end{tabular}
  }
\ExplSyntaxOff
\test{A, B, B, F, D, C, A, D, D, A, C, B}

\end{document}

I was trying to define a command to calculate the points of the paper. I want to use seq or clist module to help me with it. But I found that it failed when I put that inside tblr environment while it worked inside tabular environment.

[lvjr]

See issue #18 and #23. You need to collect table body to a macro and use expand option to expand the macro.

[lvjr]

\documentclass{article}

\usepackage{tabularray}

\ExplSyntaxOn

\NewDocumentCommand{ \test }{ m }
  {
    \seq_set_from_clist:Nn \l_tmpa_seq {#1}
    \tl_set:Nx \tblrbody { \seq_use:Nn \l_tmpa_seq {&} }
    \begin{tblr}[expand=\tblrbody]{|c|c|c|c|c|c|c|c|c|c|c|c|}
      \hline
        1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12\\ \hline
        \tblrbody \\
      \hline
    \end{tblr}
  }

\NewDocumentCommand{ \testb }{ m }
  {
    \clist_set:Nn \l_tmpa_clist {#1}
    \tl_set:Nx \tblrbody { \clist_use:Nn \l_tmpa_clist {&} } 
    \begin{tblr}[expand=\tblrbody]{|c|c|c|c|c|c|c|c|c|c|c|c|}
      \hline
      1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12\\ \hline
      \tblrbody \\
      \hline
    \end{tblr}
  }

\ExplSyntaxOff

\begin{document}

\test{C,B,B,A,B,D,B,D,ABC,BD,CD,AB}

\testb{C,B,B,A,B,D,B,D,ABC,BD,CD,AB}

\end{document}

[xkwxdyy]

@lvjr Thanks so much for your answer.