Cfrgtkky

I have a Zotero bibliography in Overleaf. I use biblatex.

usepackage[backend=biber,citestyle=authoryear]{biblatex}

addbibresource{zoteroALH.bib}

Bibliography entries look like:

@book{de_saint-gervais_uniformization_2016,

    title = {Uniformization of {Riemann} {Surfaces}},

    isbn = {978-3-03719-145-3},

    url = {https://www.ems-ph.org/books/book.php?proj_nr=198&srch=series%7Chem},

    urldate = {2019-02-03},

    author = {de Saint-Gervais, Paul Henri},

    year = {2016},

    doi = {10.4171/145}

}

In the bibliography down the paper the reference shows like this:
There is the DOI, great, but also the URL which is unnecessary when the DOI is there.

How can I remove the URL when the DOI is present?

I really thought there would be a duplicate, but I could not find a good one. (Biblatex: use doi only if there is no URL asks for the opposite and has a sourcemap solution. Redundancy in bib file: conditionally suppress url if same as doi? is asking for something slightly different and is not specific to biblatex, but has some biblatex answers, none of them uses a sourcemap, though. Print url only if doi not present is very close, the question additionally asks about eprint, but that could probably be ignored.)

My preferred solution would be to use a Biber sourcemap to completely remove the url and urldate field if the doi is present.

documentclass[british]{article}

usepackage[T1]{fontenc}

usepackage[utf8]{inputenc}

usepackage{babel}

usepackage{csquotes}



usepackage[style=authoryear, backend=biber]{biblatex}

usepackage[colorlinks]{hyperref}



DeclareSourcemap{

  maps[datatype=bibtex]{

    map{

      step[fieldsource=doi,final]

      step[fieldset=url,null]

      step[fieldset=urldate,null]

    }  

  }

}



usepackage{filecontents}

begin{filecontents}{jobname.bib}

@book{de_saint-gervais_uniformization_2016,

  title   = {Uniformization of {Riemann} {Surfaces}},

  isbn    = {978-3-03719-145-3},

  url     = {https://www.ems-ph.org/books/book.php?proj_nr=198&srch=series%7Chem},

  urldate = {2019-02-03},

  author  = {de Saint-Gervais, Paul Henri},

  year    = {2016},

  doi     = {10.4171/145}

}

end{filecontents}



addbibresource{jobname.bib}



begin{document}

cite{de_saint-gervais_uniformization_2016}

printbibliography

end{document}