rails中validates方法_Ruby_编程开发_程序员俱乐部

1.不为空:validates :name,:presence=>{:message=>'blank is not allowed'}

2.唯一性：validates :name,:uniqueness:{:message=>'already exist!',:case_sensitive=>false}#case_sensitive区分大小写

3.长度：validates :name,length:{in: 6..20,:message=>'must in 6-20 byte'}

??? 最小长度:minimum=>5，最大长度:maximum=>100

4.格式：validates :name,:format:{with: /[a-z]/,message=>'must contain at least one lower case character'}

5.范围：validates :country,:inclusion:{in:['China','USA','Jpan','Mexico'],:message=>'must one of China USA Jpan Mexico '}

6.数字：validates :graduate,:numericality:{:allow_nil=>true,greater_than: 1920,less_than_or_equal_to:Time.now.year}

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7.validates :description,presence:true,if: :require_description_presence?

?def require_description_presence?

????? self.can_send_mail

?end

?这个validates :description,presence: true只有在require_description_presence?方法返回true的时候才会起作用

?

8.validate :description_length_words

?def description_length_words

? ? unless self.description.blank? then

?????? num_words = self.description.split.length

? ? ?? if num_words < 5 then

? ? ? ?? self.errors.add(:description,'must be at least 5 words long')

? ? ?? elsif num_words > 50

????????? self.errors.add(:description,'must be at most 50 words long')

??????? end

??? end

end

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