not_working_correctly.rb

# UNEXPECTED BEHAVIOUR

class User < ApplicationRecord
  has_many :client_posts,
           class_name: Client::Post.name,
           foreign_key: :user_id
end

class Client::Post < ApplicationRecord
  # Note how the class_name is declared  here
  belongs_to :owner,
             class_name: User.name # This returns just a "User" string
end

class Client::User < ApplicationRecord
  # has no relationship to any of the above
end

# Calling reflections on the Client::Post class
Client::Post.reflections['owner']
# as part of the reflection's info, this returns an unwanted @klass name
=> @klass = Client::Post
# I'm expecting this to be just User

# Calling user.posts returns a collection of posts
# Calling client_post.owner returns nil because it's searching for a user in the Client::User table instead of the User table

workaround.rb

# Workaround
class User < ApplicationRecord
  has_many :client_posts,
           class_name: Client::Post.name,
           foreign_key: :user_id
end

class Client::Post < ApplicationRecord
  # Note that a double colon is used inside the string declaration
  belongs_to :owner,
             class_name: "::User" 
end


class Client::User < ApplicationRecord
  # has no relationship to any of the above
end


# Calling reflections on the Client::Post class
Client::Post.reflections['owner']
# as part of the reflection's info, this returns nil @klass name
=> @klass = nil
# I'm expecting this to be just User
# However the instance methods to call the related objects work correctly

# Calling user.posts returns a collection of posts
# Calling client_post.owner returns an instance of User which is what I expect