Mongoidalize throws NameError, uninitialized constant Mongoid::Relations

[Eidar]

project isn't complicated, but finding my way around mongoid relationships has been. It would be nice to find some in depth explanation.

I couldn't make my code work however I set them up so I managed to find Mongoid_Alize: https://github.com/dzello/mongoid_alize

Yet when I do it with alize or alize_to/_from, console gives me back an error on Mongoid::Relations in Ruby2.3.3/lib/ruby/gems/2.3.0/bundler/gems/mongoid_alize-b9175f4e3165/lib/mongoid/alize/macros.rb:79:in `_alize_relation_types'"

I have also included eager loading with identity_map_enabled: true in mongoid.yml

So here's the code:

Currency.rb

class Currency
include Mongoid::Document
include Mongoid::Alize

field :name, type: String
field :state, type: String
field :code, type: Integer
field :unit, type: Integer

has_many :currency_value
has_many :value, :class_name => 'Value', :inverse_of => :currency
alize_to :value
end

Value.rb

class Value

include Mongoid::Document
include Mongoid::Alize

field :date, type: DateTime
field :buying, type: String
field :middle, type: String
field :selling, type: String


belongs_to :value_currency, :class => 'Currency', :inverse_of => :currency_value
belongs_to :currency, :class_name => 'Currency', :inverse_of => :value
alize_from :currency
end

ApiService.rb

class ApiService
  # Has some api data coming from external function getApiData

def update()

 @arrayOfHashes= getApiData() #array of hashes

 @arrayOfHashes.each do |hash|
   @currency = Currency.new({
    name: hash["Name"],
    state: hash["State"],
    code: hash["Currency code"],
    unit: hash["Unit"]
  })
  @currency.create_value(
    date => hash["Date of value"],
    buying => hash["Value when buying"],
    middle => hash["Middle value"],
    selling => hash["Value when selling"])
  @currency.save
end

return @currency
end
end   

Expected result: save all 13 iterations in MongoDB with their relations.

It would be much obliged to hear some explanation here cause I'm uninspired and stuck in place. I have some background in programming and I have a feeling that it shouldn't be that complicated.

I can save either Currency model or Value but not both with their relations. Other idea is to do it manually by adding a custom foreign_id and making a method in the model which will populate hash. But that could lead to future performance issues.

Any help is appreciated, thank you :)

[Eidar]

Mistakenly closed the issue, no worries.

[joshed-io]

Hi @Eidar, I'm wondering if there isn't a mismatch between the versions of mongoid_alize and mongoid. Can you create a fresh repo with just the Gemfile, your models, and enough code to reproduce the error you're seeing?

[Eidar]

Yes, same problem still.

Ruby 2.3.3p222 (2016-11-21 revision 56859) [i386-mingw32]
Rails 5.1.6
MongoDB: v4.0.2
Mongoid 7.0.2
mongoid_alize: 0.6.0

[joshed-io]

Are you able to share that fresh repo with me? I want to help but have very limited time this week.

One suggestion would be to try with Mongoid up to 6.4. The last contribution (from @joe1chen) stated that as the most recent supported version.

[Eidar]

Here you go:

https://github.com/Eidar/mongoid_alize_test

You can take it easy, I solved it in some other way but I'm still interested in a solution here. As you say, you have very limited time and I'm not in that much of a hurry :D

[joe1chen]

I also saw the issue with Mongoid 7 and did not have the time to look into the issue with Mongoid 7. Since we are not using Mongoid 7, there was not a big reason for us to investigate this any further. But yes we should figure out the issue with Mongoid 7 eventually.

[joe1chen]

No need for a test repository. Just updating the gems to Mongoid 7 and running the existing specs is enough to reproduce the issue.

[joe1chen]

Ok, it looks like this issue with Mongoid 7 was also raised in the mongoid-rspec library and subsequently fixed (see https://github.com/mongoid/mongoid-rspec/pull/212/files). Looks like Mongoid::Relations needs to be replaced with Mongoid:Associations in version 7 and up. The pull request from the mongoid-rspec has all the details. If someone has some time to replicate this work, please do so.

[joshed-io]

Thanks @joe1chen for looking at that!