Re: passing parameters to function as variable

Merritt,

I guess you can do it with eval, but you can also do it with an array instead of a string.

my @a245 = ('a', 'The Title',
            'b', 'Subtitle',
            'c', 'Author',
            'h', '[Electronic resource]',
            );

my $field = $record->field('245');
my $revised_245 =  MARC::Field->new('245', '', '', @a245);

$field->replace_with($revised_245);

Leif Andersson

-----Ursprungligt meddelande-----
Från: Merritt H Lennox [mailto:[email protected]] 
Skickat: den 16 augusti 2007 20:35
Till: [email protected]
Ämne: passing parameters to function as variable

Hi -

I was wondering if anyone has tried creating a variable containing the
parameter list for a MARC method.

In the snippet below, I'm doing some cleanup on subfields of the 245,
and inserting a default subfield h for those lacking one.  I never know
which subfields I'll have, so rather than using a cumbersome series of
if...elsif...else statements, I'd construct the string I want to pass to
the new() function, and insert it once.  If any subfield doesn't exist,
the SFstring variable for that subfield is empty.

I know that the string in $subfield_list_245 contains the string I want,
from having used the print statement [1], but every run gives me the
error " Field 245 must have at least one subfield".

I've tried using the eval statement on the $subfield_list_245, and using
various quotation marks around it, but new() just doesn't recognize or
want to work with the string.

Is there a way to make this approach work?  Are the blanks I've
concatenated to the end a problem?

Or is there a more succinct way of approaching this in the first place?

Start snippet>>>>
if ( ! $subfield_245h ) {

    my $subfield_list_245 = $a_SFstring . $b_SFstring . $c_SFstring .
',h=>' . "'" . "[Electronic resource]" . "'" . $n_SFstring . $
p_SFstring;

## print $subfield_list_245;

    my $revised_245 =  MARC::Field->new('245', '',
'',$subfield_list_245);

    $record->replace_with($revised_245);


}
<<<<end snippet

Thanks for any ideas!

Merritt

[1] for my simple test record, the subfield list prints out:
a=>'Accountancy Ireland',h=>'[Electronic resource]'

Merritt Lennox
Library Management System Administrator
550A Bird Library
Syracuse University
Syracuse, NY 13244
315-443-9629
[email protected]

"Never doubt that a small group
of thoughtful, committed citizens
can change the world.  
Indeed, it's the only thing
that ever has." 
- Margaret Mead