gpt4 book ai didi

node.js - sails postgresql 多对多关联不起作用

转载 作者:搜寻专家 更新时间:2023-10-31 22:21:09 43 4
gpt4 key购买 nike

我正在尝试在 Operator 和 Group 这两个模型之间创建多对多关联。

两个两个模型是:

-Operator.js

    var Operator = {
connection:'postgresql',
tableName: 'operator',
schema:true,
attributes: {

firstName: {
type: 'string',
required: true,
max: 64,
columnName: 'first_name'
},
lastName: {
type: 'string',
required: true,
max: 64,
columnName: 'last_name'
},
birthDate: {
type: 'date',
columnName: 'birth_date'
},
sex: {
type: 'string',
enum: ['M', 'F', 'N.A.'],
columnName: 'sex'
},
email: {
type: 'email',
required: true,
columnName: 'email'
},
login: {
type: 'string',
required: true,
max: 64
},
password: {
type: 'string',
required: true
},

createdAt: {
columnName: 'created_at'
},

updatedAt: {
columnName: 'updated_at'
},

groups:{
collection:'group',
via:'operators'
},

// Override toJSON instance method
// to remove password value
toJSON: function() {
var obj = this.toObject();
delete obj.password;
return obj;
}


},

// Lifecycle Callbacks
beforeCreate: function(values, next) {
bcrypt.hash(values.password, 10, function(err, hash) {
if(err) return next(err);
values.password = hash;
next();
});
}

};

module.exports = Operator;

-Group.js

    var bcrypt = require('bcrypt');

var Group = {
connection:'postgresql',
tableName: 'group',
schema:true,
attributes: {
name: {
type: 'string',
required: true,
unique:true,
columnName: 'name'
},
createdAt: {
columnName: 'created_at'
},
updatedAt: {
columnName: 'updated_at'
},

operators:
{
collection:'operator',
via:'groups',
dominant:true
}
}
};
module.exports = Group;

我创建了包含两列 group_operators 和 operator_groups 的连接表 group_operators__operator_groups。

在 sails 控制台上,我尝试与此命令建立关联:

     Operator.find(149).populate('groups').exec(function(e,r){
console.log(e);
r[0].groups.add(19);
console.log(r[0]);
r[0].save(function(err){
console.log(err);})
});

但是结果出现了错误:

   null
{ groups: [],
sex: 'F',
email: 'nhjfhry@t5rjyi.girtj',
login: 'tryjrtyh',
password: '$2a$10$3pOYcOpWWcU868LBB0Gki./n9nrooXyDqSNYz1NJCkvQ480KT5uxO',
id: 149,
firstName: 'fgterier',
lastName: 'gdfgjdi',
birthDate: Thu Sep 25 2014 00:00:00 GMT+0200 (CEST),
createdAt: null,
updatedAt: Thu Oct 02 2014 12:45:14 GMT+0200 (CEST) }
[ { type: 'insert',
collection: 'group_operators__operator_groups',
criteria: { group_operators: 19, operator_groups: 149 },
values: { group_operators: 19, operator_groups: 149 },
err: [Error: Trying to '.add()' an instance which already exists!] } ]

Possibly unhandled Error: [object Object]
at Object.Promise$_rejecter [as reject] (/usr/lib/node_modules/sails/node_modules/waterline/node_modules/bluebird/js/main/promise.js:601:58)
at /usr/lib/node_modules/sails/node_modules/waterline/lib/waterline/model/lib/defaultMethods/save.js:154:16
at /usr/lib/node_modules/sails/node_modules/waterline/node_modules/async/lib/async.js:454:17
at /usr/lib/node_modules/sails/node_modules/waterline/node_modules/async/lib/async.js:444:17
at Array.forEach (native)
at _each (/usr/lib/node_modules/sails/node_modules/waterline/node_modules/async/lib/async.js:46:24)
at Object.taskComplete (/usr/lib/node_modules/sails/node_modules/waterline/node_modules/async/lib/async.js:443:13)
at processImmediate [as _immediateCallback] (timers.js:345:15)

如果我不创建连接表并尝试建立关联,sails 控制台会返回此错误:

   Error (E_UNKNOWN) :: Encountered an unexpected error
error: relation "group_operators__operator_groups" does not exist
at Connection.parseE (/home/valentina/workspace/xtens-app/node_modules/sails- postgresql/node_modules/pg.js/lib/connection.js:534:11)
at Connection.parseMessage (/home/valentina/workspace/xtens-app/node_modules/sails-postgresql/node_modules/pg.js/lib/connection.js:361:17)
at Socket.<anonymous> (/home/valentina/workspace/xtens-app/node_modules/sails-postgresql/node_modules/pg.js/lib/connection.js:105:22)
at Socket.emit (events.js:95:17)
at Socket.<anonymous> (_stream_readable.js:764:14)
at Socket.emit (events.js:92:17)
at emitReadable_ (_stream_readable.js:426:10)
at emitReadable (_stream_readable.js:422:5)
at readableAddChunk (_stream_readable.js:165:9)
at Socket.Readable.push (_stream_readable.js:127:10)

Details: error: relation "group_operators__operator_groups" does not exist

我正在使用 sails 0.10.5、sails-postgresql ^0.10.8 和 postgresql 9.3.4。

我应该创建连接表吗?问题是什么?连接表为空,因此关联不存在。

谢谢!

瓦伦蒂娜

最佳答案

我认为你不能在 postgresql 中命名表组,因为它会与内部数据库表冲突。您可以尝试在模型中将 tableName 重命名为“groups”。如果那不起作用,你可以试试这个

运营商模式 //运算符.js

.
.
.
groups:{
collection:'group',
via:'id'
},
.
.

组模型

//Groups.js

.
.
operators:
{
collection:'operator',
via:'id',
dominant:true
}
.
.

关于node.js - sails postgresql 多对多关联不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26162511/

43 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com