Problem with 2.7.2 and publications? [SOLVED]

#1

I just upgraded to 2.7.2 and one of my publications has stopped working. Stopped working in that it never comes ready. The publication is simple enough

Meteor.publish('guides.practices', () => {
  return [
    Practices.find({}, { fields: { 'buyers-guide': 1, 'sellers-guide': 1, state: 1 } }),
  ]
})

The subscription is simply

  const subsHandle = Meteor.subscribe('guides.practices')

The publication runs ok (I put a console.log there), and I even tried removing the fields object, and returning the data instead of returning an array.

I tried reverting to mongo@1.14.6 (it was 1.15), but with no success. It looks like it’s something in the Meteor core that’s upsetting it.

Other subscriptions are working ok. I am baffled.

I also tried just hacking the .meteor/release file back to 2.7.1 - it failed to start, and highlighted the packages I am using:

 Errors prevented startup:

   While selecting package versions:
   error: Conflict: Constraint mongo@1.15.0 is not satisfied by mongo 1.14.6.
   Constraints on package "mongo":
   * mongo@1.14.6 <- top level
   * mongo@~1.14.6 <- top level
   * mongo@1.10.1 || 1.12.0 <- aldeed:collection2 3.5.0
   * mongo@1.15.0 <- accounts-base 2.2.3
   * mongo@1.13.0 <- service-configuration 1.3.0
   * mongo@1.0.8 <- dburles:mongo-collection-instances 0.3.6
   * mongo@1.0.6 || 1.12.0 <- lai:collection-extensions 0.3.0 <-
   dburles:mongo-collection-instances 0.3.6
   * mongo@1.1.5 <- xolvio:cleaner 0.4.0
   * mongo@1.10.1 || 1.12.0 <- alanning:roles 3.4.0
   * mongo@1.14.6 <- oauth 2.1.2 <- accounts-oauth 1.4.1 <- accounts-facebook 1.3.3
   * mongo@1.14.6 <- oauth 2.1.2 <- bozhao:link-accounts 2.6.1
   * mongo@1.13.0 <- oauth1 1.5.0 <- twitter-oauth 1.3.0 <- accounts-twitter 1.5.0
   * mongo@1.6.2 <- reactive-dict 1.3.0 <- session 1.2.0
   * mongo@1.1.5 <- johanbrook:publication-collector 1.1.0
   * mongo@1.10.0 <- mikowals:batch-insert 1.3.0
   * mongo@1.10.1 || 1.12.0 <- matb33:collection-hooks 1.1.2

=> Your application has errors. Waiting for file change.

Does anyone have an idea how to trouble shoot this?

#2

“Fat arrow” should not be uses in publications. Try

Meteor.publish('guides.practices', function() {
#3

Unfortunately not that easy. Even doing as you suggest didn’t fix it. Other fat arrow functions were working ok. It’s strange that only this one is broken

#4

Arrow functions are not the the causes but I agree with @robfallows, we should use function() { in order to access to the context via this variable.

#5

Ok, I worked it out. The withTracker function was using a React.useState hook - which caused an exception. Somehow the switch to Meteor 2.7.2 exposed this problem.

All good now

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