has_secure_password

資料庫內雖然儲存密碼的欄位是“password_digest”，但是實際要把它的欄位名稱當成“password”來使用。

2.1.2 :001 > user = User.find_by username: "BBB"

  User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."username" = 'BBB' LIMIT 1

 => #

2.1.2 :002 > exit

kuruwateki-MacBook-Air:postit-solution shawnkuo67$ rails c

Loading development environment (Rails 4.0.0)

2.1.2 :001 > user = User.find_by username: "BBB"

  User Load (0.7ms)  SELECT "users".* FROM "users" WHERE "users"."username" = 'BBB' LIMIT 1

 => #

2.1.2 :002 > user.password= 'abcdef'

 => "abcdef"

2.1.2 :003 > user.save

   (0.2ms)  begin transaction

Binary data inserted for `string` type on column `password_digest`

  SQL (6.0ms)  UPDATE "users" SET "password_digest" = ?, "updated_at" = ? WHERE "users"."id" = 2  [["password_digest", "$2a$10$zo5T8V6MYPx3Ri8Ewah9aejNTI7grpEj9tTeVSmUoD.QyheSRhBsS"], ["updated_at", Mon, 07 May 2018 06:40:48 UTC +00:00]]

   (1.0ms)  commit transaction

 => true

2.1.2 :004 > user = User.find_by username: "BBB"

  User Load (0.3ms)  SELECT "users".* FROM "users" WHERE "users"."username" = 'BBB' LIMIT 1

 => #

2.1.2 :005 > user.authenticate("ddd")

 => false

2.1.2 :006 > user.authenticate("abcdef")
 => #