Node.js Sequelize belongtomany associations:创建一篇文章并关联其现有标记
我有两个模特协会的同事 Posts.js:Node.js Sequelize belongtomany associations:创建一篇文章并关联其现有标记,node.js,sequelize.js,has-and-belongs-to-many,Node.js,Sequelize.js,Has And Belongs To Many,我有两个模特协会的同事 Posts.js: 'use strict'; module.exports = function(sequelize, DataTypes) { var Posts = sequelize.define('Posts', { title: DataTypes.STRING, body: DataTypes.STRING }, { classMethods: { associate: function(models) {
'use strict';
module.exports = function(sequelize, DataTypes) {
var Posts = sequelize.define('Posts', {
title: DataTypes.STRING,
body: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
Posts.belongsToMany(models.Tags, {
through: 'PostsTags',
as:'posts_has_tags',
foreignKey:'postId'
});
}
}
});
return Posts;
};
'use strict';
module.exports = function(sequelize, DataTypes) {
var Posts = sequelize.define('Posts', {
title: DataTypes.STRING,
body: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
Posts.belongsToMany(models.Tags, {
through: 'PostsTags',
as:'postHasTags',
foreignKey:'postId'
});
}
}
});
return Posts;
};
和Tags.js:
'use strict';
module.exports = function(sequelize, DataTypes) {
var Tags = sequelize.define('Tags', {
name: DataTypes.STRING
},{
classMethods: {
associate: function(models) {
Tags.belongsToMany(models.Posts, {
through: 'PostsTags',
as:'posts_has_tags',
foreignKey:'tagId'
});
}
}
});
return Tags;
};
'use strict';
module.exports = function(sequelize, DataTypes) {
var Tags = sequelize.define('Tags', {
name: DataTypes.STRING
},{
classMethods: {
associate: function(models) {
Tags.belongsToMany(models.Posts, {
through: 'PostsTags',
as:'tagHasPosts',
foreignKey:'tagId'
});
}
}
});
return Tags;
};
在我的数据库中,我得到了2个现有的标签。(id:1和id:2)
当我创建一个帖子时遇到了麻烦,我想将它与这些标签中的一个关联起来
通过运行此代码:
create: function(request, reply){
let post = Object.assign({}, request.payload, request.params);
models.Posts.create({
title: post.title,
body: post.body,
posts_has_tags: [{tagId:1}]
},{
include: [{model:models.Tags, as:'posts_has_tags'}]
}).then(function(newPost){
if(!newPost){
return reply('[404] Not found').code(404);
}
reply(newPost).code(200);
})
}
它运行以下查询:
INSERT INTO `Posts` (`id`,`title`,`body`,`createdAt`,`updatedAt`) VALUES (DEFAULT,'TITLE 1','BODY 1','2017-02-05 18:33:21','2017-02-05 18:33:21');
Executing (default): INSERT INTO `Tags` (`id`,`createdAt`,`updatedAt`) VALUES (DEFAULT,'2017-02-05 18:33:21','2017-02-05 18:33:21');
Executing (default): INSERT INTO `PostsTags` (`createdAt`,`updatedAt`,`postId`,`tagId`) VALUES ('2017-02-05 18:33:21','2017-02-05 18:33:21',70,20);
'use strict';
module.exports = function(sequelize, DataTypes) {
var Posts = sequelize.define('Posts', {
title: DataTypes.STRING,
body: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
Posts.belongsToMany(models.Tags, {
through: 'PostsTags',
as:'posts_has_tags',
foreignKey:'postId'
});
}
}
});
return Posts;
};
'use strict';
module.exports = function(sequelize, DataTypes) {
var Posts = sequelize.define('Posts', {
title: DataTypes.STRING,
body: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
Posts.belongsToMany(models.Tags, {
through: 'PostsTags',
as:'postHasTags',
foreignKey:'postId'
});
}
}
});
return Posts;
};
Tags.js:
'use strict';
module.exports = function(sequelize, DataTypes) {
var Tags = sequelize.define('Tags', {
name: DataTypes.STRING
},{
classMethods: {
associate: function(models) {
Tags.belongsToMany(models.Posts, {
through: 'PostsTags',
as:'posts_has_tags',
foreignKey:'tagId'
});
}
}
});
return Tags;
};
'use strict';
module.exports = function(sequelize, DataTypes) {
var Tags = sequelize.define('Tags', {
name: DataTypes.STRING
},{
classMethods: {
associate: function(models) {
Tags.belongsToMany(models.Posts, {
through: 'PostsTags',
as:'tagHasPosts',
foreignKey:'tagId'
});
}
}
});
return Tags;
};
两个别名都是反向的
创建新帖子或更新帖子时,我可以访问promise中由sequelize(model.setAssociation)构建的setter:
upsert: function(request, reply){
let receivedPost = Object.assign({}, request.payload, request.params);
models.Posts.find({
where:{ id:receivedPost.id }
}).then(post => {
if(post){
post.setPostHasTags(receivedPost.tags)
reply(post).code(200)
} else {
models.Posts.create({
title: receivedPost.title,
body: receivedPost.body
}).then(newPost => {
newPost.setPostHasTags(receivedPost.tags)
reply(newPost).code(200);
});
}
});
setPostHasTags将返回一个承诺,对吗?在答复之前,您应该为其包含一个then()。