我有兩個Rails環境。一個運行Postgres和Rails 5.0.6的開發環境和Heroku上幾乎相同的環境。Rails回調在不同環境下表現不同
我有一個Administrator
類,它生成基於用戶的forename
和surname
字段before_save
回調的Administrator
一個用戶名。
class Administrator < ApplicationRecord
validates :username, uniqueness: true
validates :forename, presence: true
validates :surname, presence: true
before_save :generate_username
def generate_username
return if username.present?
proposed = "#{forename}#{surname}".downcase
existing_count = Administrator.where("username ILIKE ?", "#{proposed}%").size
self.username = existing_count.zero? ? proposed : "#{proposed}#{existing_count}"
end
end
用戶被驗證後,在形式FORENAMESURNAMEX
,其中X是一個遞增數目(或沒有)生成的用戶名。
下面是我在開發機器上的Rails控制檯中運行的命令。
irb(main):012:0> Administrator.create(email: '[email protected]', forename: 'Edward', surname: 'Scissorhands')
D, [2017-10-13T10:00:18.985765 #280] DEBUG -- : (0.2ms) BEGIN
D, [2017-10-13T10:00:18.987554 #280] DEBUG -- : Administrator Exists (0.5ms) SELECT 1 AS one FROM "administrators" WHERE "administrators"."email" = $1 LIMIT $2 [["email", "[email protected]"], ["LIMIT", 1]]
D, [2017-10-13T10:00:18.988923 #280] DEBUG -- : Administrator Exists (0.4ms) SELECT 1 AS one FROM "administrators" WHERE "administrators"."username" IS NULL LIMIT $1 [["LIMIT", 1]]
D, [2017-10-13T10:00:18.990155 #280] DEBUG -- : (0.4ms) SELECT COUNT(*) FROM "administrators" WHERE (username ILIKE 'edwardscissorhands%')
D, [2017-10-13T10:00:18.992000 #280] DEBUG -- : SQL (0.5ms) INSERT INTO "administrators" ("email", "created_at", "updated_at", "username", "forename", "surname") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id" [["email", "[email protected]"], ["created_at", "2017-10-13 10:00:18.990421"], ["updated_at", "2017-10-13 10:00:18.990421"], ["username", "edwardscissorhands"], ["forename", "Edward"], ["surname", "Scissorhands"]]
D, [2017-10-13T10:00:18.995845 #280] DEBUG -- : (1.8ms) COMMIT
=> #<Administrator id: 10, email: "[email protected]", created_at: "2017-10-13 10:00:18", updated_at: "2017-10-13 10:00:18", role: nil, otp_public_key: nil, username: "edwardscissorhands", forename: "Edward", surname: "Scissorhands">
正如您所看到的,執行回調並生成用戶的用戶名並將其持久保存到數據庫中。
然而,當我運行在Heroku(和Heroku的Postgres的)運行我們的測試環境相同的代碼,這是發生了什麼:
irb(main):005:0> Administrator.create!(email: '[email protected]', forename: 'Edward', surname: 'Scissorhands')
(1.9ms) BEGIN
Administrator Exists (1.1ms) SELECT 1 AS one FROM "administrators" WHERE "administrators"."email" = $1 LIMIT $2 [["email", "[email protected]"], ["LIMIT", 1]]
Administrator Exists (0.9ms) SELECT 1 AS one FROM "administrators" WHERE "administrators"."username" IS NULL LIMIT $1 [["LIMIT", 1]]
(0.9ms) ROLLBACK
ActiveRecord::RecordInvalid: Validation failed: Username has already been taken
(我使用create!
這裏,而不是create
展示驗證錯誤不會在開發過程中發生。)
我不明白爲什麼行爲應該在不同環境之間有所不同。兩者都運行相同版本的Rails(5.0.6)並運行相同的代碼庫。
這是在你的代碼一個錯字或禮物? 'Administrator.where(「username ILIKE?」,「#{proposed}%」)。size'' ILIKE'應該是'LIKE'。 –
ILIKE是LIKE,但不區分大小寫。 –