Ruby on rails 如果文本在rails模型中具有特定的单词或字符串，则显示错误

我有一个模型

问题

，它有以下字段：

• 问题：文本

• 答案1：文本

• 答案2：文本

• 答案3：文本

• 答案4：文本

我不允许提出以下问题：

• 在问题中，除了“”之外，还有“not”或“code>”
• 在答案字段中输入单词

  “以上所有内容均不”

  或

  “以上所有内容”

• 在回答字段中以“真”、“假”、“是”或“否”开头，或
• Have

  “答案在答案本身中是”

如果不适合您，您可以尝试使用regex：
在控制器中，类似于：

@question = Question.new(question_params)
if params[:question] =~  /not/ || params[:answer] =~ /all of the above/ || what-so-ever-conditions
   raise "not accepted"
else
   @question.save
end

---

但是，这不是一个好的解决方案，相反，您应该尝试@pavan在其评论中提到的方法。
您可以在模型中创建自定义验证器：

validate :check_words, :on => :create
NOT_ALLOWED_WORDS = ["not", "except"]

 def check_words 
  errors.add :question, "not allowed" unless (NOT_ALLOWED_WORDS - only_words_from_question) == NOT_ALLOWED_WORDS
end


def only_words_from_question
  self.question.split(/\W+/)
end

如果创建后有任何“不允许”字，则obj.errors.full_消息中的错误应为“不允许”

---

我想这就是你想要的。
以下是我解决问题的方法

validate :check_question, :on => :create
DISALLOW_QUESTION = ["not", "except"]

def check_question 
  DISALLOW_QUESTION.each do |w|
      errors.add :question, "shouldn't have '#{w}'", if question.include? w
  end
end

validate :check_answer, :on => :create
DISALLOW_ANSWER = ["none of the above", "all of the above", "answer is"]
START_WITH = ['true', 'false', 'yes', 'no']

def check_answer 
  DISALLOW_ANSWER.each do |w|
    errors.add :answer_1, "shouldn't have '#{w}'" if answer_1.include? w
    errors.add :answer_2, "shouldn't have '#{w}'" if answer_2.include? w
    errors.add :answer_3, "shouldn't have '#{w}'" if answer_3.include? w
    errors.add :answer_4, "shouldn't have '#{w}'" if answer_4.include? w
  end
  START_WITH.each do |w|
    errors.add :answer_1, "can't start with '#{w}'" if answer_1.start_with? w
    errors.add :answer_2, "can't start with '#{w}'" if answer_2.start_with? w
    errors.add :answer_3, "can't start with '#{w}'" if answer_3.start_with? w
    errors.add :answer_4, "can't start with '#{w}'" if answer_4.start_with? w
  end
end

---

您最好查看

验证：问题，exlusion:{in:[“not”，“except”]，消息：“not allowed”}

如果字段中有空格，则没有帮助。我投票支持这个答案，所以有人能告诉我这里出了什么问题吗？任何人都可以。