How to make a MongoDB query sort on strings with -number postfix?

Question

I have a query:

ownUnnamedPages = Entries.find( { author : this.userId, title : {$regex: /^unnamed-/ }}, {sort: { title: 1 }}).fetch()

That

Answer 1

In my case we work with aggregations. The approach was to sort using the length of our string; only works when the text part is always the same (unnamed- in your case)

db.YourCollection.aggregate([
  {
    $addFields: {
      "TitleSize": { $strLenCP: "$Title" }
    }
  },
  {
    $sort: {
      "TitleIdSize": 1,
      "Title": 1
    }
  }
]);

Now we sort using length, the second sort will use the content.

Example:

• "unnamed-2", Titlesize: 9
• "unnamed-7", Titlesize: 9
• "unnamed-30", Titlesize: 10
• "unnamed-1", Titlesize: 9

The first sort will put the ids in this order: 2, 7, 1, 30. Then the second sort will put the ids in the correct order: 1, 2, 7, 30.