https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=40275

--- Comment #2 from Tomás Cohen Arazi (tcohen) <[email protected]> ---
Created attachment 183648
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=183648&action=edit
Bug 40275: Introduce `Koha::Patrons->find_by_identifier()`

In our codebase, there's a pattern we tend to use for searching patrons
by userid and falling back to find them by cardnumber:

* C4::Auth
* C4::SIP::ILS::Patron
* (slightly different) Koha::REST::V1::Auth::Password
* (slightly different) Koha::REST::V1::Auth
* C4::Circulation
* C4::Auth_with_cas

It generally uses the following pattern:

```perl
my $patron = Koha::Patrons->find( { userid => $identifier } );
$patron //= Koha::Patrons->find( { cardnumber => $identifier } );
```

The problem with this is that `find` actually produces a DBIX::Class
warn because `find` is being called without primary key parameters. I
haven't seen it in the wild, until the latest change in
`checkpw_internal` which made it throw warnings in SIP. My
interpretation is that SIP's special approach with the Trapper.pm class
made it show where other places just get it hidden.

That said, I implemented this using `search()` to overcome this.

To test:
1. Apply the patches
2. Run:
   $ ktd --shell
  k$ prove t/db_dependent/Koha/Patrons.t
=> SUCCESS: Tests pass!
3. Sign off :-D

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