Ruby on rails 为什么我的验证正在运行？

我正在创建具有附件的对象。我通过拆分一个真实字段（可能是我问题的真正根源）来伪造字段。另外，这些都可以正常工作，但是当我附加文件时，我的验证似乎比控制器逻辑运行得更早，并且我最终得到了如下错误：

undefined method `match` for nil:Nil at line ...

attr_accessible :zipcode
has_attached_file :attachment

#this is the line referred to by the error message
validates :zipcode, format: { with: /a_meaningful_regex_here/i}

def initialize
  zipcode = '-'
end
def set_zipcode(params={})
  zipcode = "#{params[:zipcode1]}-#{params[:zipcode2]}"
end
def zipcode1
  zipcode.split('-')[0]
end
def zipcode2
  zipcode.split('-')[1]
end

<%= form_for @foo do |f| %>
  <%= f.file_field :attachment %>
  <%= text_field_tag  :zipcode1,@foo.zipcode1%> - 
  <%= text_field_tag  :zipcode2,@foo.zipcode2%>
  <%= f.submit %>
<% end %>

def create
  @foo = Foo.new(params[:foo])
  @foo.set_zipcode(params)
  if @foo.save
    redirect_to @foo
  else
    render action: 'new'
  end
end

验证是否由回形针触发？如何关闭它，或者在验证运行之前运行自己的逻辑

我的模型如下所示：

undefined method `match` for nil:Nil at line ...

attr_accessible :zipcode
has_attached_file :attachment

#this is the line referred to by the error message
validates :zipcode, format: { with: /a_meaningful_regex_here/i}

def initialize
  zipcode = '-'
end
def set_zipcode(params={})
  zipcode = "#{params[:zipcode1]}-#{params[:zipcode2]}"
end
def zipcode1
  zipcode.split('-')[0]
end
def zipcode2
  zipcode.split('-')[1]
end

<%= form_for @foo do |f| %>
  <%= f.file_field :attachment %>
  <%= text_field_tag  :zipcode1,@foo.zipcode1%> - 
  <%= text_field_tag  :zipcode2,@foo.zipcode2%>
  <%= f.submit %>
<% end %>

def create
  @foo = Foo.new(params[:foo])
  @foo.set_zipcode(params)
  if @foo.save
    redirect_to @foo
  else
    render action: 'new'
  end
end

我的表单如下所示：

undefined method `match` for nil:Nil at line ...

attr_accessible :zipcode
has_attached_file :attachment

#this is the line referred to by the error message
validates :zipcode, format: { with: /a_meaningful_regex_here/i}

def initialize
  zipcode = '-'
end
def set_zipcode(params={})
  zipcode = "#{params[:zipcode1]}-#{params[:zipcode2]}"
end
def zipcode1
  zipcode.split('-')[0]
end
def zipcode2
  zipcode.split('-')[1]
end

<%= form_for @foo do |f| %>
  <%= f.file_field :attachment %>
  <%= text_field_tag  :zipcode1,@foo.zipcode1%> - 
  <%= text_field_tag  :zipcode2,@foo.zipcode2%>
  <%= f.submit %>
<% end %>

def create
  @foo = Foo.new(params[:foo])
  @foo.set_zipcode(params)
  if @foo.save
    redirect_to @foo
  else
    render action: 'new'
  end
end

尝试以下方法：

before_validation(:on => :zipcode) { set_zipcode }

---

您是否尝试在控制器中记录某些内容，只是为了确保在验证之前不会像应该的那样对其进行处理？你确定正则表达式写得像它应该写的那样吗？如果不是，请尝试

/\Aa\u有意义的\u regex\u here\z/i

，因为问题似乎来自这里，如果问题来自zipcode的内容，则不会有nil对象，因为您使用“-”对其进行初始化。。。因此，我认为更可能是使用正则表达式或其语法。