Re: BUILD and how to create a subclass object when creating a parent

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I'm not sure you mean by create a subclass instance on creation of its
superclass. Are you intending to have the superclass object have an
attribute that holds an instance of the subclass?  Perhaps can you show a
diagram of what you intend your data to look like after construction is
complete?

On Mon, Apr 23, 2018 at 7:53 AM, Arjan Widlak - United Knowledge <
[email protected]> wrote:

> Hi,
>
> I tried to use the BUILD method to create an instance of a subclass on
> creating an instance of the parent. This does not work and the
> documentation clearly explains why:
>
> http://search.cpan.org/dist/Moose/lib/Moose/Manual/Construct
> ion.pod#BUILD_and_parent_classes
>
> BUILD methods are called from parent to child and hence this triggers a
> loop.
>
> I am able to do this with the around method modifier, however I need to
> override the behaviour in the subclass. This is also seems error prone and
> bad practice.
>
> But if this cannot be done this way, how should it be done? How can I
> always create a subclass instance on creation of it's superclass?
>
> Kind regards,
>
> Arjan
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">I&#=
39;m not sure you mean by create a subclass instance on creation of its sup=
erclass. Are you intending to have the superclass object have an attribute =
that holds an instance of the subclass?=C2=A0 Perhaps can you show a diagra=
m of what you intend your data to look like after construction is complete?=
<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">O=
n Mon, Apr 23, 2018 at 7:53 AM, Arjan Widlak - United Knowledge <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=3D"_blank">=
[email protected]</a>&gt;</span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex">Hi,<br>
<br>
I tried to use the BUILD method to create an instance of a subclass on crea=
ting an instance of the parent. This does not work and the documentation cl=
early explains why:<br>
<br>
<a href=3D"http://search.cpan.org/dist/Moose/lib/Moose/Manual/Construction.=
pod#BUILD_and_parent_classes" rel=3D"noreferrer" target=3D"_blank">http://s=
earch.cpan.org/dist/Mo<wbr>ose/lib/Moose/Manual/Construct<wbr>ion.pod#BUILD=
_and_parent_<wbr>classes</a><br>
<br>
BUILD methods are called from parent to child and hence this triggers a loo=
p.<br>
<br>
I am able to do this with the around method modifier, however I need to ove=
rride the behaviour in the subclass. This is also seems error prone and bad=
 practice.<br>
<br>
But if this cannot be done this way, how should it be done? How can I alway=
s create a subclass instance on creation of it&#39;s superclass?<br>
<br>
Kind regards,<br>
<br>
Arjan<br>
</blockquote></div><br></div>

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