Method addConnection

server/controllers/ChartController.js:258–269

(chartId, connection)

  }

  addConnection(chartId, connection) {
    return db.Chart.findByPk(chartId)
      .then((chart) => {
        return chart.addConnections([connection]);
      })
      .then((chart) => {
        return this.findById(chart.id);
      })
      .catch((error) => {
        return new Promise((resolve, reject) => reject(error));
      });
  }

  updateDatasets(chartId, datasets) {
    const updatePromises = [];