Rails 数据库迁移，未定义方法“to_sym”，无法弄清楚语法

Question

这是我原来的迁移：

class CreateUsers < ActiveRecord::Migration
  def self.up
    ActiveRecord::Base.transaction do
      create_table "users", :force => true do |t|
        t.string :login, :limit => 40
        t.string :name, :limit => 100, :default => '', :null => true
        t.string :email, :limit => 100
        t.string :crypted_password, :limit => 40
        t.string :salt, :limit => 40
        t.string :remember_token, :limit => 40
        t.datetime :remember_token_expires_at
        t.string :activation_code, :limit => 40
        t.datetime :activated_at, :datetime
        t.string :state, :null => :no, :default => 'passive'
        t.datetime :deleted_at
        t.integer :occupation_id, :null => :yes
        t.datetime :paid_up_to_date, :date
        t.timestamps
      end

我正在尝试将“状态”的默认值更改为“主动”而不是被动 这是我的第二次尝试；

class ChangeUserStateDefault < ActiveRecord::Migration
  def self.up
    change_column :users, :state, :null => :no, :default => 'active'
end

Answer 1

编辑：

错误是因为您缺少列的类型。
用法：

change_column(表名、列名、类型、选项 = {})

所以这应该适合你：

change_column :users, :state, :string, :null => false, :default => 'active'