Question

I got a One-to-Many relationship between two objects : Dashboard, and Chart, described like this :

module.exports = function (sequelize, DataTypes) {
  const Dashboard = sequelize.define('Dashboard', {
      id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true
    },
    title: {
      type: DataTypes.STRING
    }
  });

  Dashboard.associate = (models) => {
    Dashboard.belongsTo(models.User, {
      foreignKey: 'user_id',
      targetKey: 'id'
    });

    Dashboard.hasMany(models.Chart, {
      foreignKey: 'dashboard_id',
      sourceKey: 'id'
    });
  };

  return Dashboard;
};

And :

module.exports = function(sequelize, DataTypes) {
  var Chart = sequelize.define('Chart', {
      id: {
        type: DataTypes.INTEGER(32),
        primaryKey: true,
        autoIncrement: true
      },
      title: {
        type: DataTypes.STRING,
        allowNull: false
      },
      x_title: {
        type: DataTypes.STRING
      },
      y_title: {
        type: DataTypes.STRING
      },
      data_type: {
        type: DataTypes.STRING,
        allowNull: false
      },
      data_value: {
        type: DataTypes.STRING,
        allowNull: false
      },
      filters: {
        type: DataTypes.TEXT,
        allowNull: false
      }
    }
  );

  Chart.associate = (models) => {
    Chart.belongsTo(models.Dashboard, {
      foreignKey: 'dashboard_id',
      targetKey: 'id'
    });
  };

  return Chart;
};

So when I want to add a new Dashboard with several charts like this :

models.Dashboard.create({
    user_id: 1,
    title: 'Dashboard title',
    charts: [
      {
        title: 'time',
        x_title: 'Days',
        y_title: 'Count',
        data_type: 'count',
        data_value: 'visit',
        filters: '[{"type":"project","values":["1"]},{"type":"language","values":["french"]},{"type":"satisfaction","values":[1,2,3]}]'
      },
      {
        title: 'indicator',
        x_title: '',
        y_title: '',
        data_type: 'count',
        data_value: 'visit',
        filters: '[{"type":"project","values":["1","2","3","4","5","6"]},{"type":"language","values":["french"]}]'
      }
    ]
  }, { include: [models.Chart] }).then(() => {
    res.send({
      'message': 'Dashboard loaded !'
    });
  });

The dashboard is inserted into the database, but no charts inserted as well... What is the best way to add records with a one-to-many association using Sequelize ? I just try and try, and read all docs (http://docs.sequelizejs.com/manual/tutorial/associations.html#creating-with-associations) but I don't understand this problematic behaviour...

Thank's for your help and your enlightening !

Answer 1

在定义的关联中

Dashboard.hasMany(models.Chart, {
      foreignKey: 'dashboard_id',
      sourceKey: 'id'
    });

foreignKey被称为dashboard_id，但dashboard_id模型中没有Chart。

以下代码可以使用

const Dashboard = sequelize.define('dashboard', {
  title: Sequelize.STRING,
});

const Chart = sequelize.define('chart', {
  dashboard_id: Sequelize.INTEGER,
  title: Sequelize.STRING,
});

Dashboard.hasMany(Chart, {
  foreignKey: 'dashboard_id',
  sourceKey: 'id'
});
Dashboard.create({
  title: 'one',
  charts: [
    { title: 'title1' },
    { title: 'title2' }
  ]
}, { include: [Chart] }).then((result) => {
  console.log(result);
});

Answer 2

感谢您的帮助，但我需要双向的一对多关联。

按照你的方式，我仍然遇到同样的问题......我不明白为什么，也许是因为我使用Sequelize CLI，每个对象定义使用一个JS文件......或者Sequelize在适当的时候不调用同步功能。

奇怪的是，当我首先插入仪表板然后通过定义它们的dashboard_id插入图表时，它运行良好。像这样：

models.Dashboard.create({ 
    user_id: 1,
    title: 'Visites Histopad'
}).then((dashboard) => {
    models.Chart.bulkCreate([{
        dashboard_id: dashboard.id,
        title: 'time',
        x_title: 'Days',
        y_title: 'Count',
        data_type: 'count',
        data_value: 'visit',
        filters: '[{"type":"project","values":["1"]},{"type":"language","values":["french"]},{"type":"satisfaction","values":[1,2,3]}]'
      },
      {
        dashboard_id: dashboard.id,
        title: 'indicator',
        x_title: '',
        y_title: '',
        data_type: 'count',
        data_value: 'visit',
        filters: '[{"type":"project","values":["1","2","3","4","5","6"]},{"type":"language","values":["french"]}]'
      }
    ]).then(() => {
      res.send({
        'message': 'Dashboard loaded !'
      });
    });
  });

Answer 3

好吧，我想通了......我使用的是旧版Sequelize，因为seuquelize-cli加载了2.0.0-rc8版本而不是最后一个版本（4.0.0）。所以现在一切都很完美。

Sequelize : One-to-Many relationship not working when inserting values

3 个答案: