[Catalyst] catalyst tutorial: MyAppDB/Book.pm vs. MyApp/Model/Book.pm

[Marcello Romani]

mla ha scritto:
> I just finished getting the tutorial project working.
> 
> The thing I'm not clear on is this separation between lib/MyAppDB/
> and lib/MyApp/Model/
> 
> The tutorial says:
> 
> "With Catalyst::Model::DBIC::Schema you essentially end up with two sets 
> of model classes (only one of which you write... the other set is 
> created automatically in memory when your Catalyst application 
> initializes). For this tutorial application, the important points to 

The dbic classes can be written by hand (which I find easier), or 
generated by the deploy method, and then hand-tuned.

> remember are: you write the result source files in MyAppDB, but within 
> Catalyst you use the automatically created model classes in MyApp::Model."
> 
> So using DBIC::Schema, I would never create anything within the
> lib/MyApp/Model directory, other than the MyAppDB.pm module?

In MyApp/Model I usually have only MyAppDB.pm, which role is to expose 
the DBIC::Schema classes under MyAppDB/ as a catalyst model.

This doesn't mean however that "I would never create anything" else. If 
all I need is one dbic schema, then the answer to your question is "yes".

On the other hand, if I need for example to access two databases, then I 
could have another dbic-schema folder (e.g. lib/MyAppDB2) and another 
model class (lib/MyApp/Model/MyAppDB2.pm) to expose it to cat like the 
first one.

Or I could have some other type of data that don't live in a database or 
that I can't/don't want to access via dibc-class. In this case I could 
write some classes under lib/MyApp/Model that directly access that data, 
or better yet, have a set of classes (not tied to Catalyst) that deal 
with the data and expose them as a cat model via one or more wrapper 
class(es) (e.g. lib/MyApp/Model/ExtData.pm).

> 
> All the real models live in lib/MyAppDB? And if I wanted to use a
> model *outside* catalyst, I'd use MyAppDB::Book, but within
> catalyst it would be MyApp::Book?
> 
> Is this how most of you structure your projects? Is there a way
> to get the real models in lib/MyApp/Model?
> 
> Thanks.
> 
> 
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> 

Also, what do you mean by "real" models ?

Just my 2 cents.

HTH

-- 
Marcello Romani
Responsabile IT
Ottotecnica s.r.l.
http://www.ottotecnica.com