如何在sequelize中定义多列的唯一索引

Question

如何在sequelize中的列组合上定义唯一索引.例如,我想在user_id,count和name上添加唯一索引.

var Tag = sequelize.define('Tag', {
        id: {
            type: DataTypes.INTEGER(11),
            allowNull: false,
            primaryKey: true,
            autoIncrement: true
        },
        user_id: {
            type: DataTypes.INTEGER(11),
            allowNull: false,
        },
        count: {
            type: DataTypes.INTEGER(11),
            allowNull: true
        },
        name: {
            type: DataTypes.STRING,
            allowNull: true,
        })

Answer 1

你可以参考这个文档http://docs.sequelizejs.com/en/latest/docs/models-definition/#indexes

您将需要更改您的定义,如下所示并呼叫同步

var Tag = sequelize.define('Tag', {
    id: {
        type: DataTypes.INTEGER(11),
        allowNull: false,
        primaryKey: true,
        autoIncrement: true
    },
    user_id: {
        type: DataTypes.INTEGER(11),
        allowNull: false,
    },
    count: {
        type: DataTypes.INTEGER(11),
        allowNull: true
    },
    name: {
        type: DataTypes.STRING,
        allowNull: true,
    }
},
{
    indexes: [
        {
            unique: true,
            fields: ['user_id', 'count', 'name']
        }
    ]
});

Answer 2

我对将复合唯一约束应用于多个列有相同的问题，但最终无法通过以下代码修复Mysql，Sequelize（4.10.2）和NodeJs 8.9.4的问题。

queryInterface.createTable('actions', {
  id: {
      type: Sequelize.INTEGER,
      primaryKey: true,
      autoIncrement: true
  },
  system_id: {
      type: Sequelize.STRING,
      unique: 'actions_unique',
  },
  rule_id: {
      type: Sequelize.STRING,
      unique: 'actions_unique',
  },
  plan_id: {
      type: Sequelize.INTEGER,
      unique: 'actions_unique',
  }
}, {
  uniqueKeys: {
      actions_unique: {
          fields: ['system_id', 'rule_id', 'plan_id']
      }
  }
});

Answer 3

如果接受的代码不起作用，请尝试以下代码。就我而言，它为我工作，而不是被接受的工作。

var Tag = sequelize.define('Tag', {
    id: {
        type: DataTypes.INTEGER(11),
        allowNull: false,
        primaryKey: true,
        autoIncrement: true
    },
    user_id: {
        type: DataTypes.INTEGER(11),
        allowNull: false,
        unique: 'uniqueTag',
    },
    count: {
        type: DataTypes.INTEGER(11),
        allowNull: true,
        unique: 'uniqueTag',
    },
    name: {
        type: DataTypes.STRING,
        allowNull: true,
        unique: 'uniqueTag',
    }
});

Answer 4

我试图在单列上创建索引。这对我有用。希望这可以帮助。

模型

module.exports = (sequelize, DataTypes) => {
  const Tag = sequelize.define(
    "Tag",
    {
      name: { type: DataTypes.STRING, unique: true },
      nVideos: DataTypes.INTEGER
    },
    {
      indexes: [
        {
          unique: true,
          fields: ["name"]
        }
      ]
    }
  );

  return Tag;
};

移民

module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable(
      "Tags",
      {
        id: {
          allowNull: false,
          autoIncrement: true,
          primaryKey: true,
          type: Sequelize.INTEGER
        },
        name: {
          type: Sequelize.STRING,
          unique: "unique_tag"
        },
        nVideos: { type: Sequelize.INTEGER },
        createdAt: {
          allowNull: false,
          type: Sequelize.DATE
        },
        updatedAt: {
          allowNull: false,
          type: Sequelize.DATE
        }
      },
      {
        uniqueKeys: {
          unique_tag: {
            customIndex: true,
            fields: ["name"]
          }
        }
      }
    );
  },
  down: queryInterface => {
    return queryInterface.dropTable("Tags");
  }
};