Rails 4 MySQL bigInt主键问题和错误

时间:2015-02-25 00:13:48

标签: mysql ruby-on-rails activerecord rails-migrations ruby-on-rails-4.1

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上的旧帖子作为指导,我想出了以下内容来解决这个问题......

    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,此方法并未真正将“id”指定为主键,它只是另一个普通字段。此外,当我收到以下错误时......

  

Mysql2 ::错误:字段'id'没有默认值:INSERT INTO   acct_transactionsaccount_idamountdatedescription,   transaction_type_id)VALUES(224149525446,222.450361056561,   '1970-12-18 00:00:00','转移',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

迁移运行正常,但表不会播种,而id不是主要的。我犯了错误吗?或者有更好的方法吗?

非常感谢

1 个答案:

答案 0 :(得分:1)

我通过使用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

注意执行语句@第12行。当我在那里时,我还将“日期”字段更改为时间戳,无论如何我原本打算这样做。 它不漂亮并且违反了“惯例”但它完美无缺,所以我可以继续前进。谢谢你的期待。