Question

我收到以下错误：

undefined method `=' for #<CabinetItem:0x490e6f0>

我的代码都没有使用等号。你能看到问题吗？感谢。

查看电话：

<%= link_to "Toggle", {:controller => :cabinet_items, :action => :toggle_backmount, :id => cabinet_item.id } %>

controlloer方法：

def toggle_backmount
    @cabinet_item = CabinetItem.find(params[:id])
    @cabinet_item.toggle_backmount

    respond_to do |format|
      format.html { redirect_to :back }
      format.json { head :no_content }
    end
  end

模型方法：

def toggle_backmount
    if self.is_backmount
      self.update_attribute(is_backmount, false)
    else
      self.update_attribute(is_backmount, true)
    end
  end

完整Stacktrace：

#<Class:0x5f0ea28>: undefined method `=' for #<CabinetItem:0x7becc28>
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/activemodel-3.2.13/lib
/active_model/attribute_methods.rb:407:in `method_missing'
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.13/li
b/active_record/attribute_methods.rb:149:in `method_missing'
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.13/li
b/active_record/persistence.rb:180:in `update_attribute'
        from C:/Users/n0222072/AptanaWorkspace/dcms/app/models/cabinet_item.rb:4
8:in `toggle_backmount'
        from (irb):3
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/ra
ils/commands/console.rb:47:in `start'
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/ra
ils/commands/console.rb:8:in `start'
        from C:/SOFTWARE/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.13/lib/ra
ils/commands.rb:41:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

Answer 1

update_attribute的第一个参数应该是字符串或符号。实际上，您正在调用is_backmount并将结果作为第一个参数传递给update_attribute。显然在这种情况下，is_backmount返回零。你想要：

def toggle_backmount
  if self.is_backmount
    self.update_attribute(:is_backmount, false)
  else
    self.update_attribute(:is_backmount, true)
  end
end

未定义的方法`='当'='时方法中没有

1 个答案: