rails joins with select returns nil as id -

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why joins query returns id null in last haven't query id. how should prevent that?

2.1.3 :038 > foo.select('bars.comment_1, bars.comment_2, foos.rating').joins(:bars).each |b| 2.1.3 :039 >     p b.to_json 2.1.3 :040?>   end   foo load (0.3ms)  select comment_1, comment_2, rating `foos` inner join `bars` on `bars`.`foo_id` = `foos`.`id` "{\"comment_1\":\"xyz\",\"comment_2\":\"uvw\",\"rating\":\"good\",\"id\":null}" "{\"comment_1\":\"xyz\",\"comment_2\":\"uvw\",\"rating\":\"good\",\"id\":null}" "{\"comment_1\":\"xyz\",\"comment_2\":\"uvw\",\"rating\":\"fair\",\"id\":null}" "{\"comment_1\":\"xyz\",\"comment_2\":\"uvw\",\"rating\":\"poor\",\"id\":null}" "{\"comment_1\":\"xyz\",\"comment_2\":\"uvw\",\"rating\":\"good\",\"id\":null}"

you should use only option of to_json method:

foo.select('bars.comment_1, bars.comment_2, foos.rating').joins(:bars).each |b|   p b.to_json(only: [:comment_1, :comment_2, :rating]) end

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