Querying via Many-to-Many relationships uses bad key

[amedveczki]

See this thread:
http://groups.google.com/group/datamapper/browse_thread/thread/47c04728de93b2ee

If I have 2 models (Sentence, Word), which have a Many-to-Many
relationship, and Word has a field 'word', the following query:

Sentence.all(:words => { :word => "Hello" })

Tries to match "sentences.id" to "words.id" (live example at
http://pastebin.ca/2097242 ) :

FROM "sentences" 
WHERE "id" IN 
    (SELECT "words"."id"    # Query result will be a single words.id, 
which will be used as sentence id 
     FROM "words" 
     INNER JOIN "sentence_words" ON "words"."id" = 
"sentence_words"."word_id" 
     INNER JOIN "sentences" ON "sentence_words"."sentence_id" = 
"sentences"."id" 
     WHERE "words"."word" = 'Hello') 
ORDER BY "id" 

[alexwestholm]

Has there been any movement on this? This seems like a pretty serious problem.

[timmillwood]

I have the same issue:

@contents = Content.all(:type => 'blog', :published => true, :tags => {:tag => tag}, :order => [ :created.desc ], :limit => 5)

is creating

SELECT "id", "type", "title", "created", "alias", "legacy_tags", "published" FROM "contents" WHERE ("type" = 'blog' AND "published" = TRUE AND "id" IN (SELECT "tags"."id" FROM "tags" INNER JOIN "content_tags" ON "tags"."id" = "content_tags"."tag_id" INNER JOIN "contents" ON "content_tags"."content_id" = "contents"."id" WHERE "tags"."tag" = 'drupal')) ORDER BY "created" DESC LIMIT 5

Not ideal!