ruby-on-rails-4 - 轨道 4 : Remove not null constraint from table column with migration?

Question

给定以下schema.rb:

  create_table "people", force: true do |t|
    t.string   "name",  null: false
    t.integer  "age"
    t.integer  "height"
    t.string   "email"
    t.boolean  "married",  default: false
    t.text     "bio"
    t.integer  "fav_number"
    t.decimal  "lucky_num",  precision: 2, scale: 2
    t.datetime "birthday"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

我想删除 name 默认值 null: false。我尝试使用 change_column_default 运行单独的迁移，但这对 schema.rb 没有影响。有什么建议吗？

Answer 1

来自docs :

  def up
    change_column_default :table_name, :status, 0
  end

  def down
    change_column_default :table_name, :status, nil
  end