MongoError: ReferenceError: meteorBabelHelpers is not defined

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1

I have been using a mapReduce for some time now to check all possible keys in my collections. This used to work fine, until now. All of a sudden (After upgrading to 1.4.2.3, although going back to 1.4.2.1 is now the same) I am getting the following error:

Exception while invoking method 'scan.features' MongoError: ReferenceError: meteorBabelHelpers is not defined :
    at Object.Future.wait (/Users/rensholmer/.meteor/packages/meteor-tool/.1.4.2_3.1ib5jxz++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:449:15)
    at [object Object].scanFeatures (server/methods.js:178:32)
   <<<etc. etc.>>>

I have highlighted the offending line from my methods below, along with the method I am using for the mapReduce:

Meteor.methods({
  'scan.features':function(){
    this.unblock();
    //meteor requires async code to be run in a fiber/future
    const fut = new Future();

    //put the future that will hold the mapreduce output in the meteor environment, this will be used as callback for the mapreduce
    const mapReduceCallback = Meteor.bindEnvironment(function(err,res){
        if (err){
          fut.throw(err)
        } else {
          fut.return(res)
        }
      } 
    )

    //mapreduce to find all keys for all genes, this takes a while
    a = Items.rawCollection().mapReduce(
      function(){
        //map function 
        for (var key in this){
          emit(key,null) 
        }
      },
      function(key,values){
        //reduce function
        return null
      },
      { out: { inline: 1 } }, //output options
      mapReduceCallback
    )

    //let the future wait for the mapreduce to finish
    const mapReduceResults = fut.wait();                  //<-------- OFFENDING LINE

    //process mapreduce output and put it in a collection
    mapReduceResults.forEach(function(i){ 
      FilterOptions.findAndModify({ 
        query: { ID: i._id }, 
        update: { $setOnInsert: { name: i._id, show: true, canEdit: false } }, 
        new: true, 
        upsert: true 
      }) 
    })
    //add the viewing and editing option, since this key is dynamic it will not allways be present on any Item, but we do want to filter on this
    const permanentOptions = ['viewing','editing']
    permanentOptions.forEach(function(optionId){
      FilterOptions.findAndModify({
        query: { ID: optionId },
        update: { $setOnInsert: { name: optionId, show: true, canEdit: false } }, 
        new: true, 
        upsert: true 
      })
    })
    
  }
})

I have tried wrapping everything in Meteor.wrapAsync(), and I get the same error when executing the wrapped function.
As usual, any feedback is welcome!

1 Like
2

I fixed this by changing

//mapreduce to find all keys for all genes, this takes a while
    a = Items.rawCollection().mapReduce(
      function(){
        //map function 
        for (var key in this){
          emit(key,null) 
        }
      },
      function(key,values){
        //reduce function
        return null
      },
      { out: { inline: 1 } }, //output options
      mapReduceCallback
    )

to

//mapreduce to find all keys for all genes, this takes a while
    a = Items.rawCollection().mapReduce(
      function(){
        //map function 
        let keys = Object.keys(this);
        for (let i = 0; i < keys.length; i++){
          emit(keys[i],null) 
        }
      },
      function(key,values){
        //reduce function
        return null
      },
      { out: { inline: 1 } }, //output options
      mapReduceCallback
    )

Turns out the for (key in this){...} was the problem.
I found my solution here: https://github.com/meteor/meteor/issues/7184. Apparently this is still a problem?

1 Like