我有两个Rails环境。一个运行Postgres和Rails 5.0.6的开发环境和Heroku上几乎相同的环境。Rails回调在不同环境下表现不同
我有一个Administrator
类,它生成基于用户的forename
和surname
字段before_save
回调的Administrator
一个用户名。
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
用户被验证后,在形式FORENAMESURNAMEX
,其中X是一个递增数目(或没有)生成的用户名。
下面是我在开发机器上的Rails控制台中运行的命令。
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,执行回调并生成用户的用户名并将其持久保存到数据库中。
然而,当我运行在Heroku(和Heroku的Postgres的)运行我们的测试环境相同的代码,这是发生了什么:
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!
这里,而不是create
展示验证错误不会在开发过程中发生。)
我不明白为什么行为应该在不同环境之间有所不同。两者都运行相同版本的Rails(5.0.6)并运行相同的代码库。
这是在你的代码一个错字或礼物? 'Administrator.where(“username ILIKE?”,“#{proposed}%”)。size'' ILIKE'应该是'LIKE'。 –
ILIKE是LIKE,但不区分大小写。 –