What level of detail is optimal for my model?

Question

What level of detail is optimal for my model?

What is the best approach for structuring data models in Meteor?

For example, let's consider a data model with a XmlDocument containing multiple XmlNodes.

Should I create a single collection like

new Meteor.Collection("Documents")

and update it as a whole document, or should I create a separate collection for nodes with a reference to their parent document (similar to .NET Entity Framework)?

I'm unsure about the level of granularity in Meteor. Does the update method perform a diff with the current data or send the entire data as a single transaction to the server?

javascript mongodb meteor

Answer 1

Answer №1

Instead of repeatedly creating the entire document, consider using addToSet and pull methods to modify the array within your document.

var _newDocId = Documents.insert(new XmlDocument());
var _newNode = new XmlNode();
Documents.update({_id: _newDocId}, {$addToSet: {nodes: _newNode}});

Updating documents within arrays can be challenging, so ensure this method aligns with your needs before proceeding. Alternatively, you can utilize separate collections. Here's an example:

var _document = Documents.findOne({_id: _documentContainingNode});    
var _nodeToUpdateIndex = _.indexOf(_.pluck(_document.nodes, '_id'), _nodeId);
var _modifier = {$set: {}};
_modifier.$set["nodes." + _nodeToUpdateIndex + ".description"] = "new description";

Documents.update({_id: _document._id}, _modifier);

Updating objects within arrays can be cumbersome when dealing with nested structures. Managing separate collections requires careful publication synchronization and lacks operation atomicity. Consider your requirements when deciding between the two approaches, as it is ultimately your choice rather than a Meteor "implementation".

Answer 2

Instead of repeatedly creating the entire document, consider using addToSet and pull methods to modify the array within your document.

var _newDocId = Documents.insert(new XmlDocument());
var _newNode = new XmlNode();
Documents.update({_id: _newDocId}, {$addToSet: {nodes: _newNode}});

Updating documents within arrays can be challenging, so ensure this method aligns with your needs before proceeding. Alternatively, you can utilize separate collections. Here's an example:

var _document = Documents.findOne({_id: _documentContainingNode});    
var _nodeToUpdateIndex = _.indexOf(_.pluck(_document.nodes, '_id'), _nodeId);
var _modifier = {$set: {}};
_modifier.$set["nodes." + _nodeToUpdateIndex + ".description"] = "new description";

Documents.update({_id: _document._id}, _modifier);

Updating objects within arrays can be cumbersome when dealing with nested structures. Managing separate collections requires careful publication synchronization and lacks operation atomicity. Consider your requirements when deciding between the two approaches, as it is ultimately your choice rather than a Meteor "implementation".

Answer 3

Answer №2

Is the data sent as a single transaction or will it be broken up?

Unfortunately, yes, whenever there is a change in the document, the entire document is sent to the client. Therefore, it is not advisable to structure the database with one large document in one collection instead of using several collections. To understand how DDP works and what data it sends, you can install and enable the Meteor DDP Analyzer.

Answer 4

Is the data sent as a single transaction or will it be broken up?

Unfortunately, yes, whenever there is a change in the document, the entire document is sent to the client. Therefore, it is not advisable to structure the database with one large document in one collection instead of using several collections. To understand how DDP works and what data it sends, you can install and enable the Meteor DDP Analyzer.

What level of detail is optimal for my model?

Answer №1

Answer №2

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