Table of contents after renaming chapters in book document?

Question

After changing default chapter notation to Lecture, How do I get it to table of contents?
I'm getting only main chapter numbers. But I want my table of content to look like this,
Lecture 1
1.1 Introduction...........3
Lecture 2
2.2 GrahQL.................5
I have attached a M. W. E. below.
documentclass[12pt,a4paper]{book}
begin{document}
tableofcontents
makeatletter
renewcommand{@chapapp}{Lecture}
makeatother
chapter{}
section{Introduction}
chapter{}
section{GraphQL}
end{document}

Your help is highly appreciated.

Peter Wilson · Accepted Answer

Use the tocloft package.
% lecturetocprob.tex  SE 569160

documentclass[12pt,a4paper]{book}
usepackage{tocloft}
addtolength{cftchapnumwidth}{4em}  % more space for number + Lecture
renewcommand{cftchappresnum}{Lecture }
begin{document}
tableofcontents
makeatletter
renewcommand{@chapapp}{Lecture}
makeatother
chapter{}

section{Introduction}
chapter{}
section{GraphQL}

appendix

chapter{In appendix}

end{document}

I have extended your MWE to include an Appendix just to check that that would be OK, even though you are probably not having any appendices.

Jinwen · Answer

Perhaps this would work:
documentclass[12pt,a4paper]{book}

usepackage{titletoc}
titlecontents*{chapter}[0pt]{}
    {bfseriesphantomsectionhyperlink{chapter.thecontentslabel}{Lecture~thecontentslabel}}{}
    {hfillbfseriescontentspage}

usepackage{hyperref}

begin{document}
tableofcontents
makeatletter
renewcommand{@chapapp}{Lecture}
makeatother
chapter{}
section{Introduction}
chapter{}
section{GraphQL}
end{document}

egreg · Answer

You can patch @chapter so it issues chapternumberline instead of numberline: then we can define chapternumberline to do what we prefer.
documentclass[12pt,a4paper]{book}
usepackage{etoolbox}
%usepackage{hyperref}

renewcommand{chaptername}{Lecture}
makeatletter
@ifpackageloaded{hyperref}
  {patchcmd{Hy@org@chapter}}
  {patchcmd{@chapter}}
  {numberline}{chapternumberline}{}{}
newcommand{chapternumberline}[1]{chaptername #1}
makeatother

begin{document}

tableofcontents

chapter{}
section{Introduction}
chapter{}
section{GraphQL}

end{document}

I made the patch working for the cases when hyperref is loaded or not.
Note that the correct command to redefine is chaptername rather than @chapapp.

Here's a picture when hyperref is used, showing that the entire entry is a link.

Table of contents after renaming chapters in book document?

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