voting does not reflect changes on result app.

cloned the repo, ran docker-compose up.

on voting, the logs gives

vote_1    | 10.0.19.2 - - [22/Dec/2016 20:04:10] "POST / HTTP/1.1" 200 -
worker_1  | Processing vote for 'a' by 'cceb022e236a011b'
db        | ERROR:  duplicate key value violates unique constraint "votes_id_key"
db        | DETAIL:  Key (id)=(cceb022e236a011b) already exists.
db        | STATEMENT:  INSERT INTO votes (id, vote) VALUES ($1, $2)

also it does not reflect any change on the result app , even when voting for the first time.

[spara]

The duplicate key error occurs when you try to vote more than once from the same client. Each vote is inserted into the database using a cookie generated by the vote application. When you try to vote from the same client it will use the same id from the cookie which violates the duplicate key constraint in the database. Will not fix.

[thanley11]

I upgraded to postgres 9.6 and am now using the upsert functionality.

INSERT INTO votes (id, vote) VALUES (@id, @vote) ON CONFLICT (id) DO UPDATE SET vote = @vote.  

I think that may not be the issue, however, as the exception should be caught in the code and the update should happen. One issue I found is that the results app is not really connecting to postgres because of this in result/server.js:

var config = {
   host: 'db', // Need to change to name of alias in docker-compose ('db'), instead of host: 'localhost',
   user: 'postgres',
   password: '',
   database: 'postgres',
   ...
   });
 });

I changed this and also modified the getVotes function and it is all working:

 function getVotes(client) {
  client.query('SELECT vote, COUNT(id) AS count FROM votes GROUP BY vote ORDER BY vote ASC', [], function(err, result) {
     if (err) {
       console.error("Error performing query: " + err);
     } else {
        var votes = result.rowCount;
        if (result.rowCount < 2){
            votes = [result.rows[0], {"count" : 0} ];
        }
        else {
            votes = [result.rows[0], result.rows[1]];
        }
       io.sockets.emit("scores", JSON.stringify(votes));
     }
     setTimeout(function() {getVotes(client) }, 1000);
});
}

And in result/views/app/js

  var updateScores = function(){
    socket.on('scores', function (json) {
       data = JSON.parse(json);
       var a = parseInt(data[0].count || 0);
       var b = parseInt(data[1].count || 0);

       var percentages = getPercentages(a, b);

       bg1.style.width = percentages.a + "%";
       bg2.style.width = percentages.b + "%";

       $scope.$apply(function () {
         $scope.aPercent = percentages.a;
         $scope.bPercent = percentages.b;
         $scope.total = a + b;
       });
    });
  };