Please help us, i am stuck why the following code snippet work fine locally
but not on Herok. Actually problem is in callbacks they are not executing
in the sequence as expected.
// Opration hook to send push notification
GroupMember.observe('after save', function(ctx, next) {
if(ctx.instance.joinStatus != 'self') {
GroupMember.app.models.Group.findOne({
where: { id: ctx.instance.groupId},
},
function(err, group) {
if (!err){
var d = new Date();
var notId = d.getTime(); // unique notification id
var message = new gcm.Message();
message.addData('notId', notId);
message.addData('page', 'groupDetail');
message.addData('param', 'groupId');
message.addData('paramVal', ctx.instance.groupId);
if(ctx.instance.joinStatus == 'pending') { //
Sending notification to group creator
console.log(1);
message.addData('title', 'New group membership
request');
message.addData('message', 'An user requested
to join your group');
GroupMember.app.models.Push.sendNotification(
group.createdBy, message);
}else if(ctx.instance.joinStatus == 'accepted') { //
Sending notification to requested user
message.addData('title', 'Accepted group join
request');
message.addData('message', 'Your request to
join group has been accepted');
GroupMember.app.models.Push.sendNotification(ctx
.instance.userId, message);
}else if(ctx.instance.joinStatus == 'rejected') { //
Sending notificati to requested user
message.addData('title', 'Rejected group
membership request');
message.addData('message', 'Your request to
join group has been rejected');
GroupMember.app.models.Push.sendNotification(ctx
.instance.userId, message);
}
}
});
}
next();
});
In the above code snippet i am calling *sendNotification()* method whenever
a group member is created or updated.
module.exports = function(Push) {
Push.sendNotification = function(userIds, message) {
console.log(2);
Push.app.models.Installation.getDeviceToken(userIds, function (
err, deviceIds) {
console.log('returnd from instalation');
if (!err) {
console.log(deviceIds);
var apiKey = config.gcmServerApiKey;
var service = new gcm.Sender(apiKey);
service.send(message, { registrationTokens: deviceIds },
function (err, response) {
if(err) {
//console.log(deviceIds);
//console.error(err);
} else {
//console.log(deviceIds);
//console.log(response);
}
});
}
});
};
};
Now here i am calling *getDeviceToken()* function of *Installation *model
which code snippet is as following.
module.exports = function(Installation) {
Installation.getDeviceToken = function(userIds, cb) {
console.log(3);
var userIdsArr = [];
if(!Array.isArray(userIds)) {
userIdsArr.push(userIds);
} else {
userIdsArr = userIds;
}
Installation.find({
where: {
userId: {inq: userIdsArr}
},
scope: {
fields: {deviceToken: true}
}
},
function(err, result) {
if (!err) {
console.log(4);
var deviceTokens = [];
var stringifiedTokens = JSON.stringify(result);
var tokensObject = JSON.parse(stringifiedTokens);
/*tokensObject.forEach(function(token) {
deviceTokens.push(token.deviceToken);
});*/
async.each(tokensObject, function (token, callback) {
deviceTokens.push(5);
callback();
}, function (err) {
if (err) { throw err; }
cb(null, deviceTokens);
});
}else{
console.log(err);
}
});
};
};
The problem is callbacks are not waiting for others callbacks to be
finished and for their response and i am not getting results as expected.
If i run same code on local machine its working fine but not on Heroku.
Please help me where i am doing wrong.
Thank you :)
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