Ruby on rails rails中多对多多态关联中没有列错误

书的模型是

class Book < ActiveRecord::Base
has_many :tokens, :through => :taggings
has_many :taggings, :as => :taggable
end

---

您是否为您的关联创建了所有必要的列？ 标记表的模式应该与此类似

create_table "taggings", force: :cascade do |t|
    t.integer  "token_id",                  limit: 4
    t.integer  "taggable_id",               limit: 4
    t.string   "taggable_type",             limit: 255
    t.datetime "created_at",                null: false
    t.datetime "updated_at",                null: false
  end

---

我认为您缺少

标记id

列，或者忘记执行迁移。

您是否为关联创建了所有必需的列？ 标记表的模式应该与此类似

create_table "taggings", force: :cascade do |t|
    t.integer  "token_id",                  limit: 4
    t.integer  "taggable_id",               limit: 4
    t.string   "taggable_type",             limit: 255
    t.datetime "created_at",                null: false
    t.datetime "updated_at",                null: false
  end

---

我认为您缺少

token\u id

列或忘记执行迁移。

您的模型是否包含

token\u id

列？您的模型是否包含

token\u id

列？

ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: taggings.token_id: SELECT "tokens".* FROM "tokens" INNER JOIN "taggings" ON "tokens"."id" = "taggings"."token_id" WHERE "taggings"."taggable_id" = ? AND "taggings"."taggable_type" = ?

create_table "taggings", force: :cascade do |t|
    t.integer  "token_id",                  limit: 4
    t.integer  "taggable_id",               limit: 4
    t.string   "taggable_type",             limit: 255
    t.datetime "created_at",                null: false
    t.datetime "updated_at",                null: false
  end