acaul at rand
Jan 27, 2009, 2:07 PM
Post #12 of 17
(5249 views)
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On Jan 19, 2009, at 4:52 PM, David E. Wheeler wrote:
> On Jan 19, 2009, at 1:00 PM, Ashlee Caul wrote:
>
>> Hi All. I am only a beginner Perl programmer, so I'm not very
>> capable of working with Schwartzian transforms from my head. I am
>> not even sure that the Schwartz is what I want.
>>
>> What I would really like to do is to select only stories that
>> match certain criteria from fields defined by me, in this case an
>> inventory_status. If a story (which represents a product) has an
>> inventory_status of "Out of print" or "Removed from distribution"
>> or "Outdated," I do not want it to be returned by $story->list()
>> in the first place (if possible). Only "In stock" and "Coming
>> soon" stories should be returned.
>
> Unfortunately, I think you have to limit these in Perl space,
> rather than SQL. Though you could query on
>
> data_text => ANY('In stock', 'Coming soon')
>
> Which will work, as long as you don't have other fields that might
> have those values.
>
>> Then, I want to sort these all by the document_year field, which
>> is not a date but rather a text field because the year is all the
>> information we have available for this field. Since this is
>> neither the cover_date nor the publish_date, I cannot use those
>> for the Order parameter in $story->list();
>
> Correct. I do recommend you make it a date field, though, and set
> its precision to year. Either way, though, yes, you will have to
> sort them in the template code, and the Schwartzian transform is
> the most efficient way to do so.
>
>> THEN (as if that were not enough), after the stories are sorted
>> descending by document_year, I want to sort each year by
>> doc_title, which is not the Bricolage title field, so I also
>> cannot Order by that in $story->list();
>
> Right.
>
>> Finally, the doc_titles include words such as "A," "An," and
>> "The," and we do not wish to sort on those, so the template
>> removes those words at the beginning of doc_title when sorting.
>
> Right, good.
>
>> Right now I am doing this with a complicated series of hashes and
>> decision logic. This worked well for a while. Now, after four
>> years, the lists that are being sorted are getting much longer.
>> The story publish jobs keep failing because they exceed
>> MAX_PROCESS_SIZE in bricolage.conf. We have already updated that
>> value several times, and I am reluctant to continue doing so.
>>
>> Thank you for any assistance you can give.
>
> Switch to a schwartzian transform like so:
>
> my @sorted =
> map { $_->[0] }
> sort { $a->[1] <=> $b->[1] || $a->[2] cmp $b->[2] }
> map {
> (my $title = lc $_->get_value('doc_title') ) =~ s/^(?:an?|
> the)\b//;
> [ $_, $_->get_value('document_year'), $title ]
> } Story->list( data_text => ANY('In stock', 'Coming soon') );
>
OK, I took your map and shuffled it a little. This is now working.
my @related_stories =
map { $_->[0] }
sort { $b->[1] <=> $a->[1] || $a->[2] cmp $b->[2] }
map {
(my $title = lc $_->get_value('doc_title') ) =~ s/^(A|An|The|Een|De|
Het) (.+)/$2, $1/i;
[ $_, $_->get_value('document_year'), $title ]
} $story->list({ contrib_id => $author_id, element_key_name =>
"book", publish_status => 1 });
The inventory_status is a select box and turned out to be a blob, so
I can't data_text it. Is there anything else I could add to the
mapping so as to return only the books that have "In stock" or
"Coming soon" as an inventory_status? (or specifically NOT to return
books with "Removed from distribution" or "Outdated" as an
inventory_status?) Thanks again.
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