How to change bold font to Computer Modern when using Alegreya Package

Question

I want to use the Alegreya font in a book for chapter headings, but would like to use Computer Modern for the body text. The thing is, usepackage{Alegreya} makes the default font Alegreya. To set the body font back to Computer Modern I did this:
renewcommandrmdefault{lmr}

The thing is, when I try to use bold font it stays in Alegreya. I would rather it not do that, so how can I set boldface font to Computer Modern?
MWE:
documentclass{article}

RequirePackage[utf8]{inputenc}
RequirePackage{pifont}
RequirePackage[T1]{fontenc}

usepackage{Alegreya}
renewcommandrmdefault{lmr}

begin{document}
textbf{This is in Alegreya.} This is Computer Modern.
end{document}

Output:

Thanks for your time.

egreg · Accepted Answer

If you use alegreya, you're changing familydefault and changing rmdefault cannot give you Latin Modern everywhere except in chapter titles.
If you make the simple document
documentclass{article}
usepackage{Alegreya}

begin{document}

familydefault

end{document}

upon compiling it you will see

Alegreya-LF

That's the key for the following.
documentclass{book}
usepackage{sectsty}

DeclareRobustCommand{alegreyafont}{fontfamily{Alegreya-LF}selectfont}
chapterfont{alegreyafont}

begin{document}

chapter{This is in Alegreya}

This is not.

end{document}

There are other ways to change the chapter heading, sectsty offers the simplest interface.

How to change bold font to Computer Modern when using Alegreya Package

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