Is there a way to loop through a cursor and insert a new field into every document? I tried the following code, but it doesn't seem to be working:
function addNewField() {
var items = Items.find();
items.forEach(function(item) {
item.newField = true;
});
return items;
}
I need to make changes to the documents in Iron Router's data function before passing them to the template.
When it comes to your specific needs -
If you're looking to calculate a value for each item, purely for display purposes (such as fields for the template):
Items.find({ /* selector */ }, {
transform: function(item){
item.newField = true;
return item;
}
});
However, if your goal is to update every document with unique values in MongoDB using Meteor's APIs:
var items = Items.find({ /* selector */});
items.forEach(function(item){
var someValue = computeSomeValue(item);
Items.update({
_id: item._id
}, {
$set: {
newField: someValue
}
});
});
Alternatively, if you simply want to update all matched items with the SAME value:
Items.update({ /* selector */}, {
$set: {
newField: true
},
},
{
multi: true
}
);
If you are performing this task on the client-side in Meteor, the success of the last two options will also hinge on utilizing the insecure package or establishing appropriate allow or deny rules on the Items collection.
When it is unnecessary to uphold the cursor abstraction and you can simply return an Array:
function retrieveNewElements() {
return Items.find().map(function(item) {
return _.extend(item, {newField: true});
});
}
If you are adamant about maintaining a cursor abstraction, you could manage Items.find().observe callbacks that preserve newField on a local collection (for example,
NewItems = new Meteor.Collection(null)If you need to modify the items in your local MongoDB cache, make use of MongoDB update operators for efficient updating: Click here for more information
There are various methods to achieve your desired outcome, but if you opt for iterating over your cursor using forEach, it's crucial to understand that once a cursor is manually iterated within forEach, map, or fetch, it needs to be rewound according to the official documentation.
For a similar issue, refer to this answer.
function updateItems() {
var items = Items.find();
items.forEach(function(item) {
item.updatedField = true;
});
items.rewind(); // Resetting the cursor position here
return items;
}
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