HEROKU cannot read property query of null - node.js

Question

I have an error with Heroku while i try to submit information on my app.
i'm following steps from the documentation : https://trailhead.salesforce.com/en/project/quickstart-heroku-connect/qs-heroku-connect-4
I run the server, i clic on submit button then on my term i get :
{ [Error: connect ETIMEDOUT 54.228.214.47:5432]
code: 'ETIMEDOUT',
errno: 'ETIMEDOUT',
syscall: 'connect',
address: '54.228.214.47',
port: 5432 }
/home/f.freitag/workspace/radiant-dusk-13720/server.js:17
conn.query(
TypeError: Cannot read property 'query' of null
at /home/f.freitag/workspace/radiant-dusk-13720/server.js:17:13
at /home/f.freitag/workspace/radiant-dusk-13720/node_modules/pg/lib/pool.js:82:27
at /home/f.freitag/workspace/radiant-dusk-13720/node_modules/pg/node_modules/generic-pool/lib/generic-pool.js:339:9
at /home/f.freitag/workspace/radiant-dusk-13720/node_modules/pg/lib/pool.js:31:28
at null.<anonymous> (/home/f.freitag/workspace/radiant-dusk-13720/node_modules/pg/lib/client.js:176:5)
at emitOne (events.js:77:13)
at emit (events.js:169:7)
at Socket.<anonymous> (/home/f.freitag/workspace/radiant-dusk-13720/node_modules/pg/lib/connection.js:59:10)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
npm ERR! Linux 2.6.32-504.12.2.el6.x86_64
npm ERR! argv "/usr/local/node/bin/node" "/usr/local/node/bin/npm" "start"
npm ERR! node v4.5.0
npm ERR! npm v2.15.9
npm ERR! code ELIFECYCLE
npm ERR! phone-change#0.0.0 start: `node server.js`
npm ERR! Exit status 1
npm ERR! Failed at the phone-change#0.0.0 start script 'node server.js'.
npm ERR! This is most likely a problem with the phone-change package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node server.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs phone-change
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls phone-change
npm ERR! There is likely additional logging output above.
I tried to see on google for this problem but i found nothing. Also, i'm not a nodeJS programmer, it's maybe simple.
I didn't change code from the git clone.
Here the code from server.js. I put a comment on the line error
var express = require('express');
var bodyParser = require('body-parser');
var pg = require('pg');
var app = express();
app.set('port', process.env.PORT || 5000);
app.use(express.static('public'));
app.use(bodyParser.json());
app.post('/update', function(req, res) {
pg.connect(process.env.DATABASE_URL, function (err, conn, done) {
if (err) console.log(err);
conn.query( //the error
'UPDATE salesforce.Contact SET Phone = $1, HomePhone = $1, MobilePhone = $1 WHERE LOWER(FirstName) = LOWER($2) AND LOWER(LastName) = LOWER($3) AND LOWER(Email) = LOWER($4)',
[req.body.phone.trim(), req.body.firstName.trim(), req.body.lastName.trim(), req.body.email.trim()],
function(err, result) {
done();
if (err) {
res.status(400).json({error: err.message});
}
else {
res.json(result);
}
});
}
else {
done();
res.json(result);
}
}
);
});
app.listen(app.get('port'), function () {
console.log('Express server listening on port ' + app.get('port'));
});

Answer 1

The problem is with the Heroku Connect mappings. Since you've added a new field in the query you also need to update the mappings which you did during the initial setup of Heroku Connect for Contact object.
Steps:
Go to Heroku Connect
Visit mappings section and select the mapping for Contact.
Click on Edit and select HomePhone and save it.
Once above steps are done rerun the application and now should see HomePhone field value populated as same as Phone.