Exploring has_many :through relationship in the console

gistfile1.rb

2.0.0-p247 :042 > bunny = Bunny.first
  Bunny Load (0.2ms)  SELECT "bunnies".* FROM "bunnies" ORDER BY "bunnies"."id" ASC LIMIT 1
 => #<Bunny id: 9, name: "Jasper", created_at: "2014-02-09 15:01:25", updated_at: "2014-02-09 15:01:25">
 
2.0.0-p247 :043 > bunny.carrot_ids
   (0.1ms)  SELECT "carrots".id FROM "carrots" INNER JOIN "communities" ON "carrots"."id" = "communities"."carrot_id" WHERE "communities"."bunny_id" = ?  [["bunny_id", 9]]
 => []
 
2.0.0-p247 :044 > bunny.carrot_ids = [9, 10]
  Carrot Load (0.3ms)  SELECT "carrots".* FROM "carrots" WHERE "carrots"."id" IN (9, 10)
  Carrot Load (0.1ms)  SELECT "carrots".* FROM "carrots" INNER JOIN "communities" ON "carrots"."id" = "communities"."carrot_id" WHERE "communities"."bunny_id" = ?  [["bunny_id", 9]]
   (0.1ms)  begin transaction
  SQL (0.4ms)  INSERT INTO "communities" ("bunny_id", "carrot_id", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["bunny_id", 9], ["carrot_id", 9], ["created_at", Sun, 09 Feb 2014 15:09:39 UTC +00:00], ["updated_at", Sun, 09 Feb 2014 15:09:39 UTC +00:00]]
  SQL (0.1ms)  INSERT INTO "communities" ("bunny_id", "carrot_id", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["bunny_id", 9], ["carrot_id", 10], ["created_at", Sun, 09 Feb 2014 15:09:39 UTC +00:00], ["updated_at", Sun, 09 Feb 2014 15:09:39 UTC +00:00]]
   (8.0ms)  commit transaction
 => [9, 10]

2.0.0-p247 :080 > bunny.carrots.collect{|carrot| carrot.color}
 => ["green", "orange"]