Apply certain autovalue keys to all SimpleSchemas - meteor

Question

I have certain keys such as createdAt and updatedAt that should be defined in all schemas. Is there a way to avoid code duplication?
I use the SimpleSchema package.
I need the following code in all of my Schemas.xxx
createdAt: {
type: Date,
optional: true,
autoValue: function() {
if (this.isInsert) {
return new Date;
} else if (this.isUpsert) {
return {$setOnInsert: new Date};
} else {
this.unset();
}
},
autoform: {
type: 'hidden'
}
},
updatedAt: {
type: Date,
optional: true,
autoValue: function() {
if (this.isUpdate) {
return new Date();
}
},
autoform: {
type: 'hidden'
}
}

Answer 1

Create a sub schema & then include it in every collection, notice the SimpleSchema constructor is now taking an array.
Schema._Basic = new SimpleSchema({
userId: {
type: String,
optional: true
},
createdAt: {
type: Date,
label: 'Created at'
},
updatedAt: {
type: Date,
label: 'Updated at',
optional: true
},
}
});
Schema.Client = new SimpleSchema([Schema._Basic,
{
address: {
type: String
optional: true
}
}
]);

Answer 2

I would do that with help of this very nice package: matb33:collection-hooks This will add before and after hooks to your collections. So you can add createdAt and updatedAt fields like this:
For CollectionName.insert();
CollectionName.before.insert(function (userId, doc) {
var currentDate = new Date();
doc.createdAt = currentDate;
doc.updatedAt = currentDate; // could be also null if you want
});
So that in above exmaple is triggered always just before the insert takes effect. And this is for CollectionName.update();
CollectionName.before.update(function (userId, doc) {
doc.updatedAt = new Date();
});
This is triggered whenever you update your collection.