[Dbix-class] Schema Components

[Kaitlyn Parkhurst]

Have you looked at dbic-schema-config, it should provide a really simple place to insert the env search (docs on overloading in the pod, I believe), or at least a decent example of doing a similar thing. 

Sent from my iPhone

> On Sep 16, 2016, at 9:08 AM, Dave Cross <dave at dave.org.uk> wrote:
> 
> 
> In the documentation of DBIx::Class::Schema::Loader::Base there is a reference to adding "schema components"[1] to the generated classes. But I can't find any documentation on how you might write such a component - or any clearly-labelled examples of a schema component.
> 
> I think I have an example of something that I'd like to write as a schema component. Please either tell me that I'm wrong, or gently nudge me in the right direction.
> 
> Here's what I want to do. Recently I've found myself adding a useful "get_schema()" method to many of my schema classes. It looks something like this:
> 
> sub get_schema {
>  my @errs;
> 
>  foreach (qw[XXX_DB XXX_DB_USER XXX_DB_PASS XXX_DB_HOST]) {
>    push @errs, $_ unless defined $ENV{$_};
>  }
>  if (@errs) {
>    croak "You need to set the following environment variables: @errs\n";
>  }
> 
>  return __PACKAGE__->connect(
>    "dbi:mysql:database=$ENV{XXX_DB};host=$ENV{XXX_DB_HOST}",
>    $ENV{XXX_DB_USER}, $ENV{XXX_DB_PASS},
>    { mysql_enable_utf8 => 1 }
>  );
> }
> 
> The "XXX" is a placeholder for some prefix that is meaningful to whatever schema I'm working with and it will change with each project (as will, potentially, the DBD name and the options hash).
> 
> I've been copying the code into my schema classes, but we all know what a Bad Idea that is. And a schema component seemed a likely-looking approach for getting round that. I thought I could write DBIx::Class::Component::GetSchema which adds the method to any schema class that loads it.
> 
> But, as I said above, I can't find any explanations or examples of schema components that I can steal from.
> 
> Does anyone have any suggestions?
> 
> Cheers,
> 
> Dave...
> 
> [1] https://metacpan.org/pod/DBIx::Class::Schema::Loader::Base#schema_components
> 
> 
> 
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