{：limit =＆gt; 30，：string =＆gt;“提示：”，：null =＆gt; false}的未定义方法`to_sym'：哈希

Question

当我尝试运行rake db:migrate时，为什么会显示此错误：

undefined method `to_sym' for {:limit=>30, :string=>"Hint: ", :null=>false}:Hash

代码：

def up
     create_table :users do |t|
            t.string "email", :limit => 50, :string => "Forgot password!", :null => false
            t.column "password", :limit => 30, :string => "Hint: ", :null => false
            :default 

            t.timestamps
        end
      end

Answer 1

此行可能需要更改..

t.column "password", :limit => 30, :string => "Hint: ", :null => false

通过

t.string "password", :limit => 30, :string => "Hint: ", :null => false