ActiveRecordã®ã¢ã½ã·ã¨ã¼ã·ã§ã³ãæ±ãã¡ã½ããã§ãbuildãã¨ããã®ãåãã¦ç¥ãã¾ããã class Group < ActiveRecord::Base has_many :users end class User < ActiveRecord::Base belongs_to :group end ã¨ããã¢ã½ã·ã¨ã¼ã·ã§ã³ããã£ãã¨ãã«ã @group.users.build params ã¿ãããªæãã§æ¸ããã¨ãã§ãã¾ãã @group.users << userã¿ãããªã³ã¼ã㯠save ã¾ã§å®è¡ããã¦ãã¾ãã®ã§ãå ´åã«ãã£ã¦ã¯ build ã®æ¹ããããã¨ã belongs_to ã«ã¤ãã¦ã® build ãªã @user.group.build params ã ããããªã㦠@user.build_group params ã¨ããæ¸ãæ¹ãã§ããããã§ãã åèï¼ Rail
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