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0

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prevent MongoDB aggregate with $match from returning an empty Array

I have an aggregate function like this

 app.get('/feed', (req, res) => {
 TFBlog.aggregate([  
   { $sample: {size: 5} },
   { $match:  {"published": true} },
  
   ]).then((docs)=>{
   res.render('explore',{docs:docs});
 });
});

Now if aggregate finds a document that doesn't satisfy {published: true} it simply returns an empty array

So in many Use cases, I get 4 or 3 documents in return array instead of 5

I want this function to always return 5 random documents with $match criteria no matter what!!

How can I achieve this please explain?

over 2 years ago · Juan Pablo Isaza
1 answers
Answer question

0

Move $match condition to the top ?

db.collection.aggregate([  
   { $match:  {"published": true} },
   { $sample: {size: 5} }
])
over 2 years ago · Juan Pablo Isaza Report
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