Merge pull request #1724 from yasslab/update80_active_record_validations

[8.0] active_record_validations.mdの原文更新を訳文に反映

guides/source/ja/active_record_validations.md

@@ -258,16 +258,16 @@ end
 
 ```ruby
 class Person < ApplicationRecord
-  validates :terms_of_service, acceptance: { message: 'must be abided' }
+  validates :terms_of_service, acceptance: { message: "must be abided" }
 end
 ```
 
 このヘルパーでは`:accept`オプションも渡せます。このオプションは、「同意可能（acceptable）」とみなす値を指定します。デフォルトは`['1', true]`ですが、変更は簡単です。
 
 ```ruby
 class Person < ApplicationRecord
-  validates :terms_of_service, acceptance: { accept: 'yes' }
-  validates :eula, acceptance: { accept: ['TRUE', 'accepted'] }
+  validates :terms_of_service, acceptance: { accept: "yes" }
+  validates :eula, acceptance: { accept: ["TRUE", "accepted"] }
 end
 ```
 
@@ -627,7 +627,7 @@ NOTE: [`validates_associated`][]はActive Recordオブジェクトでしか利
 ```ruby
 class Person < ApplicationRecord
   validates_each :name, :surname do |record, attr, value|
-    record.errors.add(attr, '大文字で始まる必要があります') if /\A[[:lower:]]/.match?(value)
+    record.errors.add(attr, "大文字で始まる必要があります") if /\A[[:lower:]]/.match?(value)
   end
 end
 ```
@@ -1004,7 +1004,7 @@ end
 ```ruby
 class MyValidator < ActiveModel::Validator
   def validate(record)
-    unless record.name.start_with? 'X'
+    unless record.name.start_with? "X"
       record.errors.add :name, "名前はXで始まる必要があります"
     end
   end