i'm building an app using nodejs,express and sequelize. in an api i want to get data from 4 different table with one pid as input. i'm trying to associate . i'm following an mvc flow. how to table 1
/* jshint indent: 2 */
// const machine_data = require("./machine_data");
module.exports = function(sequelize, DataTypes) {
return sequelize.define('patient_data', {
sl_no: {
type: DataTypes.INTEGER(11),
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
patient_name: {
type: DataTypes.STRING(35),
allowNull: false
},
p_id: {
type: DataTypes.STRING(100),
allowNull: false,
},
{
associate:function(modals){
patient_data.hasMany(modals.master_session,{ foreignKey: 'p_id' });
patient_data.hasMany(modals.graph_data,{ foreignKey: 'pid' });
patient_data.hasMany(modals.vital_data,{ foreignKey: 'master_id' })
},
},
{
sequelize,
tableName: 'patient_data'
});
};
Table 2
module.exports = function(sequelize, DataTypes) {
return sequelize.define('master_session', {
master_id: {
type: DataTypes.INTEGER(11),
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
session_name: {
type: DataTypes.STRING(35),
allowNull: true
},
{
associate:function(modals){
master_session.belongsTo(modals.patient_data,{ foreignKey: 'p_id' });
},
},
{
sequelize,
tableName: 'master_session'
});
};
table 3
module.exports = function(sequelize, DataTypes) {
return sequelize.define('graph_data', {
sl_no: {
type: DataTypes.INTEGER(11),
autoIncrement: true,
allowNull: false,
primaryKey: true,
foreignKey:true,
refereces:{
model:'patient_data',
key:'p_name'
}
},
document: {
type: DataTypes.STRING(2000),
allowNull: true
},
pid: {
type: DataTypes.STRING(200),
allowNull: true
},
session: {
type: DataTypes.STRING(200),
allowNull: true
},
},
{
associate:function(modals){
graph_data.hasMany(modals.patient_data,{ foreignKey: 'pid' });
},
},
{
sequelize,
tableName: 'graph_data'
});
};
and there's a table 4 with same structure as T3 . Before using associations i used reference as in the code to set foreign key and manually connected this in phpmyadmin. now i got confused with what to do. I want to pass p_id from table 1 in my req.body and fetch data from rest tables. any input is appreciated. regards.
In the file where you want to fetch your data, import your PatientModel and the others. And you could do the following.
patientModel.findAll({
include: [
{
model: masterSessionModel,
attributes: // attributes from master_session
},
{
model: graphDataModel,
attributes: // attributes from graphData
},
// other associated models
]
}).then(myData => { // do something with it })
Find the time to read more in the sequelize docs over here https://sequelize.org/master/manual/assocs.html#eager-loading-example ๐