title: why iam getting only one output and please tell what should i use to get both the values explain in simplest way
body: <pre><code>const addingAttribute=async (req,res)=&gt;{
       let data = req.body
  let findPublisher=await publisherModel.find({$or:[{name:'Penguin'},{name:' HarperCollin'}]}).select({_id:1})
  console.log(findPublisher)
      let updateBook=await bookModel1.updateMany({publisher:arr},{$set:data},
  {new:true})
  console.log(updateBook)
      res.send({msg:updateBook})
      } 
  </code></pre>
  <p>For the books published by 'Penguin' and 'HarperCollins', update this key to true.</p>
  <p>but this code is updating for only the first value this is bcoz I am a using or can u please tell me anything else</p>