Thanks for you replies. But I wonder how real production web sites deal with this problem. The problem is that I want to display about 30 topics per page which would result in 30+1 queries if implemented naively. If I write the required query in raw SQL, it should be faster, but probably not very fast anyway. Also I don't know how to cache properly since topics should be ordered by most recent posts (that is, if someone posts to topic on third page, this topic should become the first one on the first page).
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