title: VueJS: Uncaught (in promise) TypeError: Cannot read property 'push' of undefined
body: <p>I am getting the 'cannot read property push of undefined' error: here is my vueJs code:</p>
  
  <pre><code>data:{
  CoIsignedListUID:[]
  }
  methods:{
  
  fetchCoISigned: function () {
              this.$http.get('/cimsm/public/api/fetchCoIsigned/' + this.conflictofInterest.complaintID).then(function (response) {
                  var data = response.data;
                  this.$set('CoIsignedList', data);
                  data.forEach(function (detail) {
                      this.CoIsignedListUID.push(detail.uID);
                  });
              });
  </code></pre>
  
  <p>what am i doing wrong? Thanks</p>