Node.js 续写添加的多个外键，而不是一个外键

由于某种原因，我最终得到了多个外键。这很奇怪，因为我试图使用

recipeID

作为以后左连接的外键。对于该操作，sequelize选择使用

RecipeURL

，这在下面的模式中没有定义

const Recipe=sequelize.define（'Recipe'）{
网址：{
类型：DataTypes.STRING（512），
allowNull:错，
独一无二：没错，
primaryKey：对
},
contentID:{
类型：DataTypes.UUID，
阿洛诺：是的
},
资料来源：{
类型：DataTypes.STRING，
allowNull:错误
},
标题：{
类型：DataTypes.STRING，
阿洛诺：是的
},
isRecipe：{
类型：DataTypes.BOOLEAN，
阿洛诺：是的，
defaultValue:null
},
ContentsURL：{
类型：DataTypes.STRING（512），
阿洛诺：是的
},
截图网址：{
类型：DataTypes.STRING（512），
阿洛诺：是的
},
});
const Comment=sequelize.define（'Comment'{
身份证：{
类型：DataTypes.STRING，
primaryKey：没错，
allowNull:错误
},
正文：{
类型：DataTypes.TEXT，
allowNull:错误
},
姓名：{
类型：DataTypes.TEXT，
阿洛诺：是的
},
日期：{
类型：DataTypes.DATE，
阿洛诺：是的
}
});
hasMany（Comment，{as:“comments”}）；
注释。belongsTo（配方{
外键：“recipeID”，
作为：“配方”，
});
（异步（）=>{
等待sequelize.sync（{alter:true，force:true}）
进程。退出（1）
})();

运行它：

$ node db.js
Executing (default): DROP TABLE IF EXISTS `Comments`;
Executing (default): DROP TABLE IF EXISTS `Recipes`;
Executing (default): DROP TABLE IF EXISTS `Recipes`;
Executing (default): CREATE TABLE IF NOT EXISTS `Recipes` (`URL` VARCHAR(512) NOT NULL UNIQUE , `contentID` CHAR(36) BINARY, `source` VARCHAR(255) NOT NULL, `title` VARCHAR(255), `isRecipe` TINYINT(1) DEFAULT NULL, `ContentsURL` VARCHAR(512), `ScreenshotURL` VARCHAR(512), `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, PRIMARY KEY (`URL`)) ENGINE=InnoDB;
Executing (default): SHOW FULL COLUMNS FROM `Recipes`;
Executing (default): SELECT CONSTRAINT_NAME as constraint_name,CONSTRAINT_NAME as constraintName,CONSTRAINT_SCHEMA as constraintSchema,CONSTRAINT_SCHEMA as constraintCatalog,TABLE_NAME as tableName,TABLE_SCHEMA as tableSchema,TABLE_SCHEMA as tableCatalog,COLUMN_NAME as columnName,REFERENCED_TABLE_SCHEMA as referencedTableSchema,REFERENCED_TABLE_SCHEMA as referencedTableCatalog,REFERENCED_TABLE_NAME as referencedTableName,REFERENCED_COLUMN_NAME as referencedColumnName FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE where TABLE_NAME = 'Recipes' AND CONSTRAINT_NAME!='PRIMARY' AND CONSTRAINT_SCHEMA='recipe' AND REFERENCED_TABLE_NAME IS NOT NULL;
Executing (default): ALTER TABLE `Recipes` CHANGE `contentID` `contentID` CHAR(36) BINARY;
Executing (default): ALTER TABLE `Recipes` CHANGE `source` `source` VARCHAR(255) NOT NULL;
Executing (default): ALTER TABLE `Recipes` CHANGE `title` `title` VARCHAR(255);
Executing (default): ALTER TABLE `Recipes` CHANGE `isRecipe` `isRecipe` TINYINT(1) DEFAULT NULL;
Executing (default): ALTER TABLE `Recipes` CHANGE `ContentsURL` `ContentsURL` VARCHAR(512);
Executing (default): ALTER TABLE `Recipes` CHANGE `ScreenshotURL` `ScreenshotURL` VARCHAR(512);
Executing (default): ALTER TABLE `Recipes` CHANGE `createdAt` `createdAt` DATETIME NOT NULL;
Executing (default): ALTER TABLE `Recipes` CHANGE `updatedAt` `updatedAt` DATETIME NOT NULL;
Executing (default): SHOW INDEX FROM `Recipes`
Executing (default): DROP TABLE IF EXISTS `Comments`;
Executing (default): CREATE TABLE IF NOT EXISTS `Comments` (`ID` VARCHAR(255) NOT NULL , `text` TEXT NOT NULL, `name` TEXT, `date` DATETIME, `createdAt` DATETIME NOT NULL, `updatedAt` DATETIME NOT NULL, `RecipeURL` VARCHAR(512), `recipeID` VARCHAR(512), PRIMARY KEY (`ID`), FOREIGN KEY (`RecipeURL`) REFERENCES `Recipes` (`URL`) ON DELETE SET NULL ON UPDATE CASCADE, FOREIGN KEY (`recipeID`) REFERENCES `Recipes` (`URL`) ON DELETE SET NULL ON UPDATE CASCADE) ENGINE=InnoDB;
Executing (default): SHOW FULL COLUMNS FROM `Comments`;
Executing (default): SELECT CONSTRAINT_NAME as constraint_name,CONSTRAINT_NAME as constraintName,CONSTRAINT_SCHEMA as constraintSchema,CONSTRAINT_SCHEMA as constraintCatalog,TABLE_NAME as tableName,TABLE_SCHEMA as tableSchema,TABLE_SCHEMA as tableCatalog,COLUMN_NAME as columnName,REFERENCED_TABLE_SCHEMA as referencedTableSchema,REFERENCED_TABLE_SCHEMA as referencedTableCatalog,REFERENCED_TABLE_NAME as referencedTableName,REFERENCED_COLUMN_NAME as referencedColumnName FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE where TABLE_NAME = 'Comments' AND CONSTRAINT_NAME!='PRIMARY' AND CONSTRAINT_SCHEMA='recipe' AND REFERENCED_TABLE_NAME IS NOT NULL;
Executing (default): ALTER TABLE `Comments` CHANGE `text` `text` TEXT NOT NULL;
Executing (default): ALTER TABLE `Comments` CHANGE `name` `name` TEXT;
Executing (default): ALTER TABLE `Comments` CHANGE `date` `date` DATETIME;
Executing (default): ALTER TABLE `Comments` CHANGE `createdAt` `createdAt` DATETIME NOT NULL;
Executing (default): ALTER TABLE `Comments` CHANGE `updatedAt` `updatedAt` DATETIME NOT NULL;
Executing (default): SELECT CONSTRAINT_CATALOG AS constraintCatalog, CONSTRAINT_NAME AS constraintName, CONSTRAINT_SCHEMA AS constraintSchema, CONSTRAINT_TYPE AS constraintType, TABLE_NAME AS tableName, TABLE_SCHEMA AS tableSchema from INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE table_name='Comments' AND constraint_name = 'Comments_ibfk_1' AND TABLE_SCHEMA = 'recipe';
Executing (default): ALTER TABLE `Comments` DROP FOREIGN KEY `Comments_ibfk_1`;
Executing (default): SELECT CONSTRAINT_CATALOG AS constraintCatalog, CONSTRAINT_NAME AS constraintName, CONSTRAINT_SCHEMA AS constraintSchema, CONSTRAINT_TYPE AS constraintType, TABLE_NAME AS tableName, TABLE_SCHEMA AS tableSchema from INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE table_name='Comments' AND constraint_name = 'Comments_ibfk_2' AND TABLE_SCHEMA = 'recipe';
Executing (default): ALTER TABLE `Comments` DROP FOREIGN KEY `Comments_ibfk_2`;
Executing (default): ALTER TABLE `Comments` ADD FOREIGN KEY (`RecipeURL`) REFERENCES `Recipes` (`URL`) ON DELETE SET NULL ON UPDATE CASCADE;
Executing (default): ALTER TABLE `Comments` ADD FOREIGN KEY (`recipeID`) REFERENCES `Recipes` (`URL`) ON DELETE SET NULL ON UPDATE CASCADE;

---

看最后两行。为什么要添加两个外键？我认为这可能是缓存问题或类似的问题。因此，如果我可以编辑一个内部模式文件并注释掉这个RecipeURL引用，它可能会解决这个问题。

因为您已经这样声明了它

Recipe.hasMany(Comment, { as: "comments" });

在这里，sequelize会自动选择主键作为表外键。 您的主键不是id。您设置的主键是

URL

Comment.belongsTo(Recipe, {
    foreignKey: "recipeID",
    as: "recipe",
});

在这段代码中，您将覆盖默认的foreignKey。您将其称为

recipeID

在

Recipe

关联中指定相同的值，您将只看到一个外键。

将

{foreignKey:“recipeID”}

添加到

hasMany

-声明中，它起了作用。