如何在类中检索变量的值 [英] How to retrieve value of a variable in class
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问题描述
Hello我有一个问题从一个方法中检索值。我在node.js中使用sequelize。
Hello I have a problem to retrieve a value from a method. I'm using sequelize in node.js.
当我这样做时,如何获取placeTmp ['id']:
How can get placeTmp['id'] when I do this:
server.js:
server.js:
var Sequelize = require('sequelize');
var sequelize = new Sequelize(config.database, config.username, config.password);
var Place = sequelize.import(__dirname + '/model/Place');
console.log(Place.getActualId()); // An ID but I'll retrieve undefined :(
Place.js:
module.exports = function(sequelize, DataTypes) {
var place = sequelize.define('Place', {
name : DataTypes.STRING,
address : DataTypes.STRING,
city : DataTypes.STRING,
zipcode : DataTypes.INTEGER,
website : DataTypes.STRING,
start : DataTypes.DATE,
end : DataTypes.DATE,
type : DataTypes.STRING,
actual : DataTypes.BOOLEAN
},
{
underscore : true,
timestamps : false,
freezeTableName: true,
classMethods: {
getActualId: function(){
this.find({where: {actual: 1}}).on('success', function(placeTmp){
return placeTmp['id'];
})
}
}
});
return place;
}
非常感谢
推荐答案
异步操作你应该这样做:
Bacause getting an ID is async operation You should do something like this:
var Sequelize = require('sequelize');
var sequelize = new Sequelize(config.database, config.username, config.password);
var Place = sequelize.import(__dirname + '/model/Place');
Place.getActualId(function(id){ console.log(id); });
module.exports = function(sequelize, DataTypes) {
var place = sequelize.define('Place', {
name : DataTypes.STRING,
address : DataTypes.STRING,
city : DataTypes.STRING,
zipcode : DataTypes.INTEGER,
website : DataTypes.STRING,
start : DataTypes.DATE,
end : DataTypes.DATE,
type : DataTypes.STRING,
actual : DataTypes.BOOLEAN
},
{
underscore : true,
timestamps : false,
freezeTableName: true,
classMethods: {
getActualId: function(callback){
this.find({where: {actual: 1}}).on('success', function(placeTmp){
callback(placeTmp['id']);
})
}
}
});
return place;
}
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