Created
October 28, 2013 08:21
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Пример сложного запроса с подзапросом, выбираем номера книжек раздела, после чего выбираем авторов, книжки у которых иданы и принадлежат типу и номер входит в номера книжек раздела
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def self.for_classic(compilation = nil) | |
if compilation.nil? | |
classic_ids_query = sprintf('SELECT "books".id FROM "books" | |
INNER JOIN "books_products" ON "books_products".book_id = "books".id | |
INNER JOIN "products" ON "products".id = "books_products".product_id | |
WHERE (products.id = %d) | |
AND ("books"."status" IN (%s, %s))', Product.classic_product.id, "E'published'", "E'republishing'") | |
else | |
classic_ids_query = sprintf('SELECT "books".id FROM "books" | |
INNER JOIN "books_compilations" ON "books".id = "books_compilations".book_id | |
WHERE ("books_compilations".compilation_id = %d ) | |
AND ("books"."status" IN (%s, %s))', compilation, "E'published'", "E'republishing'") | |
end | |
Author.all( :joins => ['left outer join authors_books on authors_books.author_id = authors.id'], | |
:select => ['count(authors_books.book_id) as author_books, authors.full_name, authors.id'], | |
:group => 'authors.id, authors.full_name', | |
:order => 'authors.full_name DESC', | |
:conditions => "authors_books.book_id in (#{classic_ids_query})") | |
end |
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