On 10/11/06, ahFeel <[EMAIL PROTECTED]> wrote:
> Hi,
>
> i'm working on a project using Ferret for indexing it's datas. I'm very
> happy with it but i need to code an extension to implement a .to_json
> method to TopDocs class, because ruby's json implementation is really
> really slow...
>
> It's my second (the first was the tutorial :/ ) ruby C extension, so i'm
> not really at ease with ruby C bindings, even with the C experience...
>
> Here is my problem :
>
> I would like to load each document from ids in my TopDoc object, to make
> the json string myself from that, but i don't know how to load my
> documents from this class... it's really weirdo to me actually :\ hope
> somebody can help !
>
> Here is my code, situated in r_search.c :
>
> static VALUE
> frt_td_to_json(VALUE self)
> {
> int i;
> VALUE rhits = rb_funcall(self, id_hits, 0);
> VALUE rhit;
> const int len = RARRAY(rhits)->len;
> long pos;
>
> for (i = 0; i < len; i++)
> {
> rhit = RARRAY(rhits)->ptr[i];
> pos = FIX2INT(rb_funcall(rhit, id_doc, 0));
> //
> // HERE I WOUlD LIKE TO LOAD THE DOCUMENTS, ID IS THE GOOD DOC_ID..
> // I WOULD LIKE TO GET THIS IN FACT (ruby):
> // doc_id = INDEX.search('query').hits.first
> // INDEX[doc_id].load <== THAT'S WHAT I WOULD LIKE TO GET !
> //
> }
> rstr = rb_str_new2(str);
> free(str);
> return (argv[0]);
> }
>
> of course, i've bound the method to the good object etc...
>
> Hope somebody'll help !
> Thank you by advance,
> Jeremie 'ahFeel' BORDIER
>
The frt_td_to_s method is doing almost exactly this. Make sure you
have have version 0.10.9 or later. Each TopDocs object has a reference
to the searcher that created it. You can get a LazyDoc object for the
searcher with the following call:
LazyDoc *lazy_doc = sea->get_lazy_doc(searcher, id);
By the way, id should be an int, not a long. To turn this into the
lazy loading Hash object that you see in Ruby you use this method:
VALUE frt_get_lazy_doc(LazyDoc *lazy_doc)
The code for cLazyDoc is in r_index.c.
Can I ask why you need to do this in the C code? It would seem to me
to make a lot more sense to code this in Ruby but you probably have a
good reason.
Cheers,
Dave
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