mysql - Rails 4 MySQL bigInt 主键问题和错误

Question

我需要在 Rails 4.1.8 应用程序中使用 14 位 bigInt 作为主键。使用 SO 上的旧帖子作为指南，我想出了以下解决这个问题的方法......

    class CreateAcctTransactions < ActiveRecord::Migration
      def change
        create_table "acct_transactions", :id => false do |t|
            t.integer :id, :limit => 8,null: false
            t.integer  "account_id",limit: 8,null: false
            t.integer  "transaction_type_id", null: false
            t.datetime "date",null: false
            t.text     "description",limit: 255
            t.decimal  "amount",precision: 10, scale: 2, null: false
        end
      end
    end

但是，该方法并没有真正将“id”分配为主键，它只是另一个普通字段。另外，当我收到以下错误时......

Mysql2::Error: Field 'id' doesn't have a default value: INSERT INTO acct_transactions (account_id, amount, date, description, transaction_type_id) VALUES (224149525446, 222.450361056561, '1970-12-18 00:00:00', 'Transfer', 6)

当我尝试运行以下种子文件时...

    account_transactions = []

    accounts.each do |i|
        80.times do |j|
            type = types.sample
        case (type)
            ...
        end

        t = AcctTransaction.new
        t.id = SecureRandom.random_number(99999999999999) # 14-digit BigInt
        t.account_id = accounts[j].id
        t.transaction_type_id = type
        t.date = Time.at((Time.now.month - 18) + rand * (Time.now.to_f)).to_date
        t.description = description
        t.amount = amount

        t.save
        account_transactions << t
      end
    end

迁移运行良好，但该表不会播种并且 id 不是主表。我犯了错误吗？或者有更好的方法吗？

非常感谢

Answer 1

我通过像这样使用 SQL 执行编写迁移来修复它:

    class CreateAcctTransactions < ActiveRecord::Migration
      def self.up
        # create ACCT_TRANSACTIONS table
          create_table "acct_transactions", id: false, force: true do |t|
            t.integer  "id",                  limit: 8,                            null: false
            t.timestamp "date",                                                     null: false
            t.text     "description",         limit: 255
            t.decimal  "amount",                          precision: 10, scale: 2, null: false
            t.integer  "account_id",          limit: 8,                            null: false
            t.integer  "transaction_type_id",                                      null: false
          end
          execute "ALTER TABLE acct_transactions ADD PRIMARY KEY (id);"
          add_index "acct_transactions", ["account_id"], name: "fk_acct_transactions_accounts1_idx", using: :btree
          add_index "acct_transactions", ["date", "id"], name: "BY_DATE", using: :btree
          add_index "acct_transactions", ["transaction_type_id"], name: "fk_acct_transactions_transaction_types1_idx", using: :btree
      end

      def self.down
        drop_table :acct_transactions
      end
    end

请注意第 12 行的 execute 语句。当我在那里时，我还将“日期”字段更改为时间戳，这是我最初打算做的。它不漂亮并且违反了“惯例”，但它工作得很好，所以我可以继续前进。感谢您的关注。