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
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:
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.
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:
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
Hi dave !
First, thank you a lot for this anwser !
I’ve been looking and trying a lot of things such as
sea = (Searcher *)DATA_PTR(self)
to use the sea->get_lazy_doc function, but it returns a null pointer…
maybe i did something wrong, i’ll retry, and be sure to have the last
ferret release
Concerning the reasons i’m doing this directly in C, it’s just because
we need a really fast implementation… I’m working with Florent S. who
you already knows, works on a big project using Ruby / Ferret. These
datas are supposed to transit over a RPC protocol, and there will be a
lot of queries, so we really need a fast to_json method
Thank you again,
Jeremie ‘ahFeel’ BORDIER
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) ruby C extension, so i’m
