顺序迁移：关系<table>不存在

Question

我正在通过Author hasMany Books示例进行工作，并尝试运行sequelize-cli迁移，但是在运行以下迁移时遇到以下问题：

ERROR: relation "authors" does not exist

这是创建作者的第一个迁移：

'use strict';
module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable('Authors', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      firstName: {
        type: Sequelize.STRING
      },
      lastName: {
        type: Sequelize.STRING
      },
      dateOfBirth: {
        type: Sequelize.DATEONLY
      },
      dateOfDeath: {
        type: Sequelize.DATEONLY
      },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.dropTable('Authors');
  }
};

第二次迁移创建一本书：

'use strict';
module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable('Books', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      title: {
        type: Sequelize.STRING
      },
      summary: {
        type: Sequelize.STRING
      },
      isbn: {
        type: Sequelize.STRING
      },
      createdAt: {
        allowNull: false,
        type: Sequelize.DATE
      },
      updatedAt: {
        allowNull: false,
        type: Sequelize.DATE
      }
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.dropTable('Books');
  }
};

迁移以创建作者和书籍之间的关系：

'use strict';

module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.addColumn(
      'Books', // name of source model
      'AuthorId',
      {
        type: Sequelize.INTEGER,
        references: {
          model: 'authors',
          key: 'id'
        },
        onUpdate: 'CASCADE',
        onDelete: 'SET NULL'
      }
    )
  },

  down: (queryInterface, Sequelize) => {
    return queryInterface.removeColumn(
      'Books',
      'AuthorId'
    )
  }
};

这些是我的模型：

author.js：

'use strict';
module.exports = (sequelize, DataTypes) => {
  var Author = sequelize.define('Author', {
    firstName: { type: DataTypes.STRING, allowNull: false, len: [2, 100] },
    lastName: { type: DataTypes.STRING, allowNull: false },
    dateOfBirth: { type: DataTypes.DATEONLY },
    dateOfDeath: { type: DataTypes.DATEONLY }
  }, {});
  Author.associate = function (models) {
    // associations can be defined here
    Author.hasMany(models.Book);
  };
  return Author;
};

book.js：

'use strict';
module.exports = (sequelize, DataTypes) => {
  var Book = sequelize.define('Book', {
    title: { type: DataTypes.STRING, allowNull: false, len: [2, 100], trim: true },
    summary: { type: DataTypes.STRING, allowNull: false },
    isbn: { type: DataTypes.STRING, allowNull: false }
  }, {});

  Book.associate = function (models) {
    // associations can be defined here
    Book.belongsTo(models.Author);
  };
  return Book;
};

我尝试了各种各样的事情都无济于事。我的猜测是，它正在尝试以异步方式更改表，但先前的迁移已完成并完成：

我正在使用以下内容：

"pg": "^7.4.3"
"sequelize": "^4.37.10"
"sequelize-cli": "^4.0.0"
 "express": "~4.16.0"

我是新手，有任何帮助将不胜感激！

Answer 1

您已经创建了Authors表，但是用一个小号引用了它a。应该像

references: {
  model: 'Authors',
  key: 'id'
},