Get a server method result before executing a Collection transform - coffeescript

Question

Working on CoinsManager, I have a model directory with a class per file, and I want to read and list all those files in my collection transform method, to initialize my doc with the correct class.
server/methods.coffee:
Meteor.methods
implemented_coins: ->
"""
Returns a list of coins that have been implemented
"""
files = fs.readdirSync './app/models/cryptos/'
file.replace(".coffee.js", "") for file in files.filter (file) ->
file.search("(base_crypto*)|(js.map)") == -1
collections/addresses.coffee:
if Meteor.isReady
#implementedCoins = Meteor.call "implemented_coins"
#Addresses = new Meteor.Collection "addresses",
transform: (doc) ->
# Retrieve class from code, and pass it the address
if doc.code in #implementedCoins
new #[doc.code] doc.address
else doc
client/views/addresses/addresses_list.coffee
Template.userAddresses.helpers
userAddresses: ->
addresses = Addresses.find
userId: Meteor.user()._id
address.set_balance() for address in addresses
return addresses
Right now, I'm getting the following error on the client console:
Exception from Deps recompute: TypeError: Array.prototype.indexOf called on null or undefined
at indexOf (native)
at Addresses.Meteor.Collection.transform
Which means that in my collection transform, the #implementedCoins variable is undefined, because I didn't implement it correctly.
Any idea how to solve this problem ?

Answer 1

I'm pretty sure that this is wrong:
if Meteor.isReady
#implementedCoins = Meteor.call "implemented_coins"
I don't think there is a field in Meteor with that name, and even if it was, then it would get executed on startup, but at that time isReady is probably false and so your variable doesn't get set. Did you mean Meteor.startup? Secondly, on the client you need to use a callback for call, since there are no fibers on the client.
Would this work instead?
Meteor.startup(function () {
Meteor.call("implemented_coins", function(err, res) {
implementedCoins = res;
});
});