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5 个月前关闭。
我有个问题。
SELECT *
FROM posts CROSS JOIN public."postReactions" AS reactions
WHERE posts.userId = '423abb9e-a00d-4045-9e88-4a85897f67e4'
但是来自 DB 的响应类似于“错误:列posts.userid 不存在”。
第 3 行:WHERE posts.userId = '423abb9e-a00d-4045-9e88-4a85897f67e4'。
CROSS JOIN 的结果如下:
帖子表
PostReactions 表 Sequelize 以下模型:
export default models => {
const {
User,
Post,
PostReaction,
PostNegativeReaction,
Comment,
Image
} = models;
User.hasMany(Post);
User.hasMany(PostReaction);
Post.belongsTo(User);
Post.hasMany(PostReaction);
PostReaction.belongsTo(Post);
PostReaction.belongsTo(User);
};
这是我的协会:
export default {
up: (queryInterface, Sequelize) => queryInterface.sequelize
.transaction(transaction => Promise.all([
queryInterface.addColumn('posts', 'userId', {
type: Sequelize.UUID,
references: {
model: 'users',
key: 'id'
},
onUpdate: 'CASCADE',
onDelete: 'SET NULL'
}, { transaction }),
queryInterface.addColumn('postReactions', 'userId', {
type: Sequelize.UUID,
references: {
model: 'users',
key: 'id'
},
onUpdate: 'CASCADE',
onDelete: 'SET NULL'
}, { transaction }),
queryInterface.addColumn('postReactions', 'postId', {
type: Sequelize.UUID,
references: {
model: 'posts',
key: 'id'
},
onUpdate: 'CASCADE',
onDelete: 'SET NULL'
}, { transaction }),
])),
down: queryInterface => queryInterface.sequelize
.transaction(transaction => Promise.all([
queryInterface.removeColumn('posts', 'userId', { transaction }),
queryInterface.removeColumn('postReactions', 'userId', { transaction }),
queryInterface.removeColumn('postReactions', 'postId', { transaction })
]))
};
MERN 堆栈。
主要问题:如何向数据库发出请求，以接收带有 POSTS 正文的响应(仅当前用户喜欢)。