select distinct returns nil（globalize3）

Question

Post.find(:all, :select => "DISTINCT author")

[#<Post author: nil>, #<Post author: nil>, #<Post author: nil>, #<Post author: nil>, #<Post author: nil>]を返します。

ただし、SQL要求SELECT DISTINCT author FROM posts;は期待どおりに機能します。

私はglobalize3を使用しています。 Post.select('DISTINCT author').with_translations('en')はすべてのレコードを返します。

Post Load (0.5ms) SELECT "posts"."id" AS t0_r0, "posts"."description" AS t0_r1, "posts"."position" AS t0_r2, "posts"."created_at" AS t0_r3, "posts"."updated_at" AS t0_r4, "posts"."date" 
AS t0_r5, "post_translations"."id" AS t1_r0, "post_translations"."post_id" AS t1_r1, "post_translations"."locale" AS t1_r2, "post_translations"."author" 
AS t1_r3, "post_translations"."description" AS t1_r4, "post_translations"."created_at" AS t1_r5, "post_translations"."updated_at" 
AS t1_r6 FROM "posts" LEFT OUTER JOIN "post_translations" ON "post_translations"."post_id" = "posts"."id" WHERE "post_translations"."locale" = 'en' 
AND (post_translations.author IS NOT NULL) 

がどのように異なる値のみを選択することができます。ここで
は、それがログのですか？

Answer 1

はこの単純なことかもしれません：

Post.find(:all, :group => author) 

更新：

はpostgresのように見えるが、もう少し対応のMySQLよりも、その代わりにこれを試してみてください。

Post.select("DISTINCT ON (author) *")