Accessing nested array in autoform hook - meteor

Question

I have a collection that looks like this:
"request":{
type: [Object],
optional: true,
autoValue: function() {
var input = this.field('requestInput');
var type = this.field('requestTypeInput');
var emailTo = this.field('emailToInput');
var direction = this.field('directionInput');
var d = new Date;
//var requestFiles = this.field('requestFiles');
//console.log(requestFiles.value);
if(!!input.value){
if(this.isInsert){
return [{
"_id":Random.id(),
date: new Date(),
type: type.value,
details: input.value,
emailTo: emailTo.value,
direction : direction.value,
// requestFiles: requestFiles.value,
createdBy: this.userId
}];
} else {
return {
$push: {
"_id":Random.id(),
date: new Date(),
type: type.value,
details: input.value,
emailTo: emailTo.value,
direction : direction.value,
// requestFiles: requestFiles.value,
createdBy: this.userId
}
};
}
} else {
this.unset();
}
}
},
'request.$.date': {
type: Date,
optional: true
},
'request.$.details': {
type: String,
optional: true
},
'request.$.createdBy':{
type: String,
optional: true
},
"request.$.type":{
type: String
},
"request.$._id":{
type: String
},
"request.$.emailTo":{
type: String,
max: 1000,
optional: true
},
"request.$.direction":{
type: String,
max: 1000,
optional: true
},
"request.$.requestFiles":{
type: [String],
optional: true
}
What i want to do is use a before hook to set the value of the requestFiles but i cannot access it. This is what I have so far:
before:{
"method-update": function(doc) {
doc.$set.request.requestFiles = arrayOfFiles.list();
return doc;
}
}
this is telling me :
Uncaught TypeError: Cannot set property 'requestFiles' of undefined.
I have also tried:
doc.$set.request.0.requestFiles = arrayOfFiles.list();
doc.$set.request[0].requestFiles = arrayOfFiles.list();
I just want to pass that array value. If there is another solution to passing that value i will accept it.