Using QueryParser vs building my own query

Ruby Apps Ferret
1

Hello all

I finally caved in and decided I should build my own query instead of
relying on QueryParser to do the job for me, but I’ve hit a strange
problem…

Here’s how I build my query:

#Main query
query = Ferret::Search::BooleanQuery.new

#Build query to match types
typesquery = Ferret::Search::BooleanQuery.new
@selected_types.each{|type|
typesquery.add_query(
Ferret::Search::TermQuery.new(Ferret::Index::Term.new(‘type’,
type)),
Ferret::Search::BooleanClause::Occur::SHOULD
)
}

#Add types query to main query
query.add_query(typesquery, Ferret::Search::BooleanClause::Occur::MUST)

#Build query to match content and title
contenttitlequery = Ferret::Search::BooleanQuery.new
contenttitlequery.add_query(
Ferret::Search::TermQuery.new(Ferret::Index::Term.new(‘content’,
params[:query])),
Ferret::Search::BooleanClause::Occur::SHOULD
)
contenttitlequery.add_query(
Ferret::Search::TermQuery.new(Ferret::Index::Term.new(‘title’,
params[:query])),
Ferret::Search::BooleanClause::Occur::SHOULD
)

#Add content+title query to main query
query.add_query(contenttitlequery,
Ferret::Search::BooleanClause::Occur::MUST)

The problem is that index.search(query) always gives me 0 results.
However, if I do index.search(query.to_s) it returns the results I
expect…

Here’s an example output of query.to_s:

+(type:Foo type:Bar) +(content:baz title:baz)

What I’m trying to do is search for items that is of type Foo or Bar and
has “baz” in either the content or the title.

Does anyone have an idea of what’s going on here?

Thanks,
Tore

2

On 6/27/06, Tore D. [email protected] wrote:

#Add types query to main query
Ferret::Search::TermQuery.new(Ferret::Index::Term.new(‘title’,
The problem is that index.search(query) always gives me 0 results.
Does anyone have an idea of what’s going on here?
You must have used a lowercasing analyzer. You’ll need to lowercase
the “Foo” and “Bar”. QueryParser will do that for you. An easy fix.

Cheers,
Dave

3

David B. wrote:

On 6/27/06, Tore D. [email protected] wrote:

#Add types query to main query
Ferret::Search::TermQuery.new(Ferret::Index::Term.new(‘title’,
The problem is that index.search(query) always gives me 0 results.
Does anyone have an idea of what’s going on here?
You must have used a lowercasing analyzer. You’ll need to lowercase
the “Foo” and “Bar”. QueryParser will do that for you. An easy fix.

Cheers,
Dave

You’re right, thanks. For some reason I had set the type field to be
tokenised…

Tore