Joe Van Dyk wrote:
I often need to do something like:
def search *keywords
select * from something where column ilike '%first-keyword%' OR
column ilike '%second-keyword%' ......;
end
So, the query would contain an arbitrary amount of OR'd conditions,
depending on how many keywords were passed in to the search function.
I'm having trouble getting sequel to do the right syntax. If I wanted
AND instead of ORs, I could do something like:
query = DB[:table]....
keywords.each { |k| query = query.filter("column ilike ?, "%#{k}%" }
The Dataset#or method can add ORs:
query = keywords.inject( DB[:table] ) do |query,kw|
pat = '%' + kw
if query.send( :simple_select_all? )
query.filter( :column.ilike(pat) )
else
query.or( :column.ilike(pat) )
end
end
It's violating the 'protected' visibility of the
Dataset#simple_select_all? method, but I'm not sure how to know when to
use #or and when to use #filter otherwise. Suggestions, Jeremy?
If you want to avoid the #send, you could always just unshift the first
keyword, start your query with that, and inject the rest.
--
Michael Granger <[email protected]>
http://deveiate.org/
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