Question

我正在为两种类型创建模型和迁移，Player和Team有多对多的关系。我正在使用sequelize model：create，但是看不到如何指定外键或连接表。

sequelize model:create --name Player --attributes "name:string"
sequelize model:create --name Team --attributes "name:string"

创建模型后，我添加了关联。在玩家：

Player.belongsToMany(models.Team, { through: 'PlayerTeam', foreignKey: 'playerId', otherKey: 'teamId' });

团队：

Team.belongsToMany(models.Player, { through: 'PlayerTeam', foreignKey: 'teamId', otherKey: 'playerId' });

然后使用

运行迁移

sequelize db:migrate

Player和Team有表，但数据库中没有连接表（也没有外键）。如何创建外键和连接表？有没有关于如何做到这一点的权威指南？

Answer 1

我也有像你这样的问题，我搜索过，但没有运气。这就是我所做的，我修改了你的代码。我手动为连接表创建迁移。我为这两个外键添加了复合索引。

module.exports = {
  up: function(queryInterface, Sequelize) {
    return queryInterface.createTable('PlayerTeam', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
    playerId: {
      type: Sequelize.INTEGER,
      allowNull: false,
      references: {
        model: 'Player',
        key: 'id'
      },
      onUpdate: 'cascade',
      onDelete: 'cascade'
    },
    teamId: {
      type: Sequelize.INTEGER,
      allowNull: false,
      references: {
        model: 'Team',
        key: 'id'
      },
      onUpdate: 'cascade',
      onDelete: 'cascade'
    },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    }).then(() => {
      // Create Unique CompoundIndex
      let sql = `CREATE UNIQUE INDEX "PlayerTeamCompoundIndex"
              ON public."PlayerTeam"
              USING btree
              ("playerId", "teamId");
            `;
      return queryInterface.sequelize.query(sql, {raw: true});
      });
  },
  down: function(queryInterface, Sequelize) {
    return queryInterface.dropTable('PlayerTeam');
  }
};

如何使用sequelize或sequelize-cli

1 个答案: