On 6/21/06, Marcus Crafter <[EMAIL PROTECTED]> wrote:
> David Balmain wrote:
> > On 6/14/06, Marcus Crafter <[EMAIL PROTECTED]> wrote:
> > Hi Marcus,
> >
> > Sorry, this is a mistake in the docs. It doesn't make sense to open an
> > IndexReader with an anonymous RAMDirectory as it obviously won't
> > contain any index yet. The problem is that the IndexReader is trying
> > to read the segments file which it expects to be there but, since no
> > index has been written, there is no segments file. If you pass a
> > RAMDirectory that actually contains an index written by an IndexWriter
> > or Index class then it should work.
>
> Hi David,
>
> Thanks mate for the information. I actually get the same problem when
> attempting to use a writer:
>
> @ramDIr = RAMDirectory.new
> @writer = IndexWriter.new(@ramDir)
>
> That gives me:
>
> IOError: No file segments
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/store/ram_store.rb:79:in
> `open_input'
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/index/segment_infos.rb:70:in
> `read'
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/index/index_writer.rb:108:in
> `initialize'
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/store/directory.rb:135:in
> `while_locked'
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/index/index_writer.rb:103:in
> `initialize'
> /sw/lib/ruby/1.8/monitor.rb:229:in `synchronize'
>
> /sw/lib/ruby/gems/1.8/gems/ferret-0.9.3/lib/ferret/index/index_writer.rb:102:in
> `initialize'
>
> I didn't think that was expected. Essentially I'm trying to the
> following equivalent Lucene code:
>
> protected void setUp() throws Exception
> {
> ramDir = new RAMDirectory();
> IndexWriter writer = new IndexWriter(ramDir, new
> StandardAnalyzer(),
> true);
> for (int i = 0; i < texts.length; i++)
> {
> addDoc(writer, texts[i]);
> }
>
> writer.optimize();
> writer.close();
> reader = IndexReader.open(ramDir);
> numHighlights = 0;
> }
>
> The only way I've been able to get it to work is by using an on disk
> index rather than a in-memory based one.
>
> Any thoughts?
You need to set the :create option to true. Or you could use the
:create_if_missing option, it doesn't really make any difference.
Personally, I'd just use the Index class. You should only need to fall
back to the IndexWriter and IndexReader classes if you are doing more
advanced stuff with index like writing your own filters. Anyway here
is the code for your example;
def setup
ram_dir = RAMDirectory.new
writer = IndexWriter.new(nil, :create => true)
texts.each {|text| writer << text}
writer.optimize
writer.close
reader = IndexReader.open(ram_dir);
end
If you are having trouble debugging something you can try require
'rferret' instead of 'ferret'. This will use the pure Ruby version of
Ferret and you should be able to more easily find the problem.
Hope that helps,
Dave
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