Entity class uninitialized in other entity

[Andrey Aleksandrov]

I have User and Message entities and I want to add users attribute to Message.

I have tried to do it like in entities guide: http://hanamirb.org/guides/1.0/models/entities/

# lib/vkbus/entities/user.rb
class User < Hanami::Entity
  attributes do
    attribute :id, Types::Strict::Int
    attribute :username, Types::Strict::String
    attribute :first_name, Types::Strict::String
    attribute :last_name, Types::Strict::String
  end
end

# lib/vkbus/entities/message.rb
class Message < Hanami::Entity
  attributes do
    attribute :id, Types::Strict::Int
    attribute :text, Types::Strict::String
    attribute :date, Types::Strict::Time
    attribute :users, Types::Collection(User)
  end
end

But the code returned an exception:

/app/lib/vkbus/entities/message.rb:7:in `block in <class:Message>': uninitialized constant Message::User (NameError)

After that, I tried to use Hanami::Entity::User and got the same result.

/app/lib/vkbus/entities/message.rb:7:in `block in <class:Message>': uninitialized constant Hanami::Entity::User (NameError)

At last time, I tried to add messages attribute to User for check and I was surprised because it works!

class User < Hanami::Entity
    attributes do
        ...
        attribute :messages, Types::Collection(Message) ## works
    end
end

class Message < Hanami::Entity
    attributes do
        ...
        attribute :users, Types::Collection(User) ## doesn't work
    end

How can it be possible? Am I doing something wrong?

P.S. You can find code of my app in this repo: https://github.com/postgred/vkbus

[Luca Guidi]

@postgred Code in lib/ directory is eager loaded in alphabetical order.

lib/vkbus/entities/message.rb is required before of lib/vkbus/entities/user.rb, that's why it fails to find User as constant.

To fix this you should add at the top of lib/vkbus/entities/message.rb

require_relative "./user"